HK1198390A1

HK1198390A1 - Aluminium alloy and methods for preparing the same

Info

Publication number: HK1198390A1
Application number: HK14111897.5A
Authority: HK
Inventors: 陈思暐; 王建国; 王喜光; 宁建林; 舒立; 杨斌
Original assignee: 厦门厦顺铝箔有限公司
Priority date: 2014-06-18
Filing date: 2014-11-25
Publication date: 2015-04-17
Also published as: US20170137918A1; EP3159421B1; CN104073690A; EP3159421A4; WO2015192448A1; EP3159421A1

Abstract

The present invention relates to an aluminium alloy and a process of producing the same, wherein the aluminium alloy comprises Al, Si, Fe, Mg, Cu, Ti and optionally other impurities, characterized in that the components are comprised in amounts by weight of: Si: 0.04-0.1%, Fe: 0.2-0.4%, Mg: 0.055-0.12%, Cu: 0.004-0.01%, Ti: 0.003-0.02%; any one of the other impurities is in an amount by weight of no more than 0.03%; and the balance is Al. The present invention also relates an article comprising the aluminium alloy, the use of the aluminium alloy article for printing plate, and a process of producing an aluminium alloy sheet/strip/foil for printing plate using the aluminium alloy.

Description

Aluminum alloy product and method for manufacturing same

Technical Field

The present invention relates to aluminium alloys which can be used for printing plate making, in particular for (computer) direct plate making. The invention also relates to an aluminium alloy article made of the alloy, in the form of e.g. a strip, foil or plate, and a method for its manufacture.

Background

In recent years, with the continuous development of printing technology, plate materials used in the printing industry are developed from common pre-coated photosensitive plates (PS plates) to computer-to-plate (CTP plates), meanwhile, the overall requirements of printing on the plate materials are high, the characteristics of the CTP technology have high requirements on the CTP plate materials and aluminum alloy plates, strips and foils for producing the CTP plate materials, such as appearance performance, physical performance, adaptability to electrolytic performance and the like, and particularly, the CTP plate materials are mainly used for high-grade color printing plate making at present, the quality of the plate is required to be ensured, and the performance of a plate base is a premise. The printing industry generally has the following specific requirements:

1) requirements for aluminium alloy sheet/strip/foil geometry

a) Thickness and tolerance

The thickness of the aluminum alloy strip/foil/plate for the CTP plate is generally 0.14mm-0.50mm, and the thickness tolerance is +/-0.005 mm

b) Tolerance of width

The width tolerance of the alloy plate/strip/foil is required to be less than or equal to +/-0.5 mm

c) Longitudinal and transverse uniformity

The tolerance of the longitudinal and transverse thickness of the aluminum alloy plate/strip/foil is less than or equal to +/-0.005 mm. The thickness of the plate material set by the plate making machines of various models is mostly 0.280mm or 0.275 mm; the vertical and horizontal thickness deviation can affect plate making, and the parameters set by the CTP plate making machine are generally not allowed to be adjusted randomly.

2) Requirements for the appearance of aluminium alloy sheets/strips/foils

The basic requirements on the appearance of the aluminum alloy plate/strip/foil are clean and flat, and the aluminum alloy plate/strip/foil has no defects of cracks, corrosion pits, spots, air holes, scratches, creases, marks, peeling, pine branch-shaped patterns, oil marks and the like; the surface is not allowed to have the defects of non-metal pressing and sticking, peeling, transverse striation and the like; problems such as chromatic aberration, bright stripes and the like are not allowed; the phenomena of bulge, lotus leaf edge and the like can not occur.

3) Requirements for mechanical Properties of aluminium alloy sheets/strips/foils

a) The aluminum plate base for the CTP plate material must have good physical and mechanical properties and baking plate properties.

b) The CTP printing plate mostly adopts an automatic plate feeding and automatic positioning punching device, and the plate material is required to have certain stiffness. If the plate base is too soft, the stiffness is poor, and the plate is easy to bend to influence the plate mounting. The aluminum plate is too hard to be leveled.

4) Requirement for electrolytic Properties of aluminum alloy sheet/strip/foil

The CTP printing plate is mainly used for high-grade color printing, so the sand mesh value of a plate base of the CTP plate is smaller than that of a PS plate, particularly, a frequency modulation screen or a frequency modulation/amplitude modulation mixed screening technology is mainly adopted for scanning plate making of the CTP plate making machine, the reduction of fine mesh points and mesh lines is directly related to the surface roughness of the plate base, namely, the sand mesh value of the plate base, and the coarser the sand mesh, the poorer the reduction of the mesh points and the mesh lines. The fine and uniform grain layer to be obtained by electrolysis is related to the apparent mass and surface roughness of the board substrate itself. If the apparent quality of the board substrate is too poor, the defects and defects of the layout cannot be eliminated without strengthening electrolysis, resulting in coarse grains. If the Ra value of the plate base is more than or equal to 0.30 μm, fine grains are difficult to be made.

To prepare a fine and uniform grain layer, the inherent composition of the aluminum substrate is critical, namely related to the composition of the aluminum alloy for producing the aluminum substrate, namely related to the content and composition of trace special metals contained in the aluminum alloy. And is also related to the processing and treatment process of the aluminum alloy plate.

Good aluminum alloy plate/strip/foil is required to have good physical and mechanical properties and good electrolysis adaptability, and can be suitable for electrolysis of hydrochloric acid and nitric acid solution; sensitivity to electrolytic grit is also required to form a fine and uniform layer of grit without intensive treatment.

5) Requirements for shape of aluminium alloy/strip/foil

Aluminum alloy plate/strip/foil flatness (plate shape) for CTP is high in requirement, because most CTP equipment adopts scanning imaging, unlike PS plate printing, the plate surface and a film are tightly adhered by adopting a vacuumizing mode, and if the plate flatness is poor, the laser imaging quality is influenced. Therefore, CTP aluminum alloy plate/strip/foil production has high demand for flatness.

In the art, the key technologies that generally need to be controlled for the manufacture of aluminium alloy sheet/strip/foil are as follows:

1, controlling the content of key trace elements, and improving the mechanical property and the electrolytic graining property.

2, adopting a high-temperature homogenization annealing process to improve the internal organization structure of the product.

3, adopting proper cold rolling intermediate annealing temperature and time to achieve the mechanical property of the product.

Currently, in the CTP printing aluminum plate/strip/foil market, AA1050 alloy is mainly used, and the AA1050 alloy can refer to 2008 3 rd total 182 th aluminum processing page 15-18 quality requirements and typical quality problem analysis of the aluminum base material for CTP, such as HEC brand aluminum plate base produced by guangdong shao guan yuandong sun foil limited company. The quality of electrochemical roughening is affected by many factors, such as: current density, linear velocity, chemical composition, etc. In order to obtain a better roughened surface, an AA1050 alloy is generally used, and the content of aluminum is controlled to be more than 99.5%.

The AA1050 alloy is generally adopted at present, and the alloy composition control standard is as follows:

Si（Max）	0.25
		Fe（Max）	0.4
Cu（Max）	0.05
		Mn（Max）	0.05
Mg（Max）	0.05
		Zn（Max）	0.05
V（Max）	0.05
		Ti（Max）	0.03
Other Each（Max）	0.03
		Others Total	--
Al(Min)	99.50

the control criteria can be found, for example, in International designation and Chemical Composition Limit for Unalloyed Aluminum, revised by the Aluminum industry Association in 2003, website www.aluminium.org.

Typical mechanical properties of the CTP base prepared according to the composition table are that the normal-temperature tensile strength is 130-150MPa, the yield strength is 120-140MPa, and the elongation is 1.0-3.0%; the tensile strength of the plate baking is 120-130MPa, the yield strength is 110-120MPa, the elongation is 2.0-3.5%, the performance is not stable enough, the fluctuation is large, and the quality of the printing plate is seriously influenced. Meanwhile, due to the low baking performance, the requirement of CTP for improving the printing resistance rate cannot be well met.

The CTP printing plate is mainly used for high-grade color printing, so the sand mesh value of a plate base of the CTP plate is smaller than that of a PS plate, particularly, a frequency modulation screen or a frequency modulation/amplitude modulation mixed screening technology is mainly adopted for scanning plate making of the CTP plate making machine, the reduction of fine mesh points and mesh lines is directly related to the surface roughness of the plate base, namely, the sand mesh value of the plate base, and the coarser the sand mesh, the poorer the reduction of the mesh points and the mesh lines. The alloy has poor electrolytic performance due to poor uniformity of internal structure of the matrix, and the grain structure after electrolytic coarsening has different thicknesses, so that the alloy has poor reducibility and cannot meet the use requirement of a high-grade CTP plate base.

Disclosure of Invention

In view of the above problems of the prior art, an object of the present invention is to provide an aluminum plate/strip/foil for printing plate and a method for manufacturing the same, wherein the aluminum plate/strip/foil has a uniform internal structure, high surface quality, good plate surface flatness, high strength, mechanical properties at room temperature and baking, and an excellent electrolytic grain structure.

Accordingly, the present invention provides an aluminium alloy for use in printing plate making comprising Al, Si, Fe, Mg, Cu, Ti and other impurities, characterised in that: the weight contents of the components are as follows: si: 0.04-0.1%, Fe: 0.2-0.4%, Mg: 0.055-0.12%, Cu: 0.004 to 0.01%, Ti: 0.003-0.02%; the single weight content of the other impurities is not more than 0.03%; the balance being Al. Wherein, Mg/Fe > = 0.125.

The invention also provides a manufacturing method of the aluminum alloy product for printing plate making, which is characterized by comprising the following steps of:

1) respectively adding the raw materials of the alloy into a smelting furnace, melting, refining, deslagging, degassing, filtering, and then casting into plate ingots with the thickness of about 500-about 650 mm;

2) sawing the head and the tail of the slab ingot, milling the surface, heating to about 500 to about 600 ℃, preserving the heat for about 2 to about 12 hours, and discharging; hot rolling the slab ingot in a hot rolling mill to a strip of about 2.0 to about 5.0mm thickness; the finishing temperature is from about 250 ℃ to about 320 ℃;

3) rolling the strip on a cold rolling mill to a thickness of about 1 to about 3mm, the work roll roughness should be Ra of about 0.30 to about 0.80 μm;

4) intermediate annealing the cold-rolled strip obtained in the step 3) in an annealing furnace at about 350 to about 450 ℃, and discharging the cold-rolled strip after heat preservation for about 2 to about 4 hours;

5) continuously roughing the cold rolled strip obtained in step 4) on a cold rolling mill to about 0.14 to about 0.4 mm; ra about 0.15 to about 0.30 μm;

6) cleaning, trimming, stretch-bending and straightening the cold-rolled strip obtained in step 5) to obtain the aluminum alloy product for printing plate making, which is in the form of a belt, a foil or a plate, for example, according to the invention.

Accordingly, the present invention also provides an aluminum alloy sheet/strip/foil for printing plate making produced by the above production method, the alloy sheet/strip/foil composition comprising the aluminum alloy of the present invention in a single weight.

The aluminum alloy sheet/strip/foil may have a thickness of about 0.14mm to about 0.50mm, preferably a thickness of about 0.20 to 0.38mm, for example about 0.220mm to about 0.275 mm.

The aluminum alloy articles (e.g., aluminum alloy strip) of the present invention have a tensile strength of about 175 to about 210MPa, a yield strength of about 170 to about 200MPa, and/or an elongation of about 2% to about 6% at room temperature.

The aluminum alloy article is subjected to simulated baking conditions at a temperature of 240 ℃ for 10 minutes, and after cooling, the aluminum alloy article has a tensile strength of about 145 to about 170MPa, a yield strength of about 135 to about 155MPa, and/or an elongation of about 3% to about 8%.

Drawings

FIG. 1: the as-cast and annealed grains of the alloy strip produced in example 1 of the present invention were compared to those of the alloy sheet made from the prior art AA1050 alloy.

FIG. 2: the alloy strip produced in example 1 of the present invention was compared with the precipitation of intermetallic compound (second phase) particles in the alloy sheet made of the prior art AA1050 alloy.

FIG. 3: the alloy strip produced in example 1 of the present invention was compared to the grit of the alloy sheet made from the prior art AA1050 alloy.

FIG. 4: the finished product corrosion performance of the alloy strip produced in example 1 of the present invention was compared to that of the alloy sheet made of the prior art AA1050 alloy.

FIG. 5: the alloy strips of examples 1-5 of the present invention were compared to the grained image of an alloy sheet made from the prior art 1050 alloy. The test conditions are as follows: SEM multiplied by 250, linear speed of 50m/min, 60m/min, 70m/min, 80 m/min.

FIG. 6: the alloy strips of examples 1-5 of the present invention were compared to the grained image of an alloy sheet made from the prior art 1050 alloy. The test conditions are as follows: SEM multiplied by 1000, linear speed of 50m/min, 60m/min, 70m/min, 80 m/min.

FIG. 7: the corrosion attack in the grit electrolyte of the alloy strips of examples 1-5 of the present invention was compared to that of the alloy sheets made from the prior art 1050 alloy. The test conditions are as follows: corrosion attack after 5 seconds degreasing, SEM × 40 times.

FIG. 8: the corrosion attack in the grit electrolyte of the alloy strips of examples 1-5 of the present invention was compared to that of the alloy sheets made from the prior art 1050 alloy. The test conditions are as follows: corrosion attack after 5 seconds of degreasing treatment: SEM × 250 times.

Detailed Description

The invention provides an aluminum alloy for printing plate making, the formula of which comprises Al, Si, Fe, Mg, Cu, Ti and other impurities, and the aluminum alloy is characterized in that: the weight contents of the components are as follows: si: 0.04-0.1%, Fe: 0.2-0.4%, Mg: 0.055-0.12%, Cu: 0.004 to 0.01%, Ti: 0.003-0.02%; the single weight content of the other impurities is not more than 0.03%; the balance being Al. Wherein, Mg/Fe > = 0.125.

In one embodiment, the content of Si is preferably not less than 0.05%, and still preferably not less than 0.06%. In one embodiment, the content of Si is preferably not higher than 0.10%, and also preferably not higher than 0.08%.

In one embodiment, the content of Fe is not less than 0.21%, preferably not less than 0.25%, and still preferably not less than 0.3%. In one embodiment, the content of Fe is preferably not higher than 0.39%, and also preferably not higher than 0.38%.

In one embodiment, the content of Mg is preferably not less than 0.06%, and still preferably not less than 0.07%. In one embodiment, the content of Mg is preferably not higher than 0.11%, and also preferably not higher than 0.10%.

In one embodiment, the content of Cu is preferably not less than 0.0045%, and further preferably not less than 0.005%. In one embodiment, the Cu content is preferably not higher than 0.009%, and also preferably not higher than 0.008%.

In one embodiment, the content of Ti is preferably not less than 0.004%, and further preferably not less than 0.005%. In one embodiment, the content of Ti is preferably not higher than 0.017%, and also preferably not higher than 0.015%.

The aluminum alloys of the present invention may contain impurities common in the art, such as Li, Na, Pb, Be, Zn, V, with individual impurities present in amounts no greater than 0.03% by weight. Preferably, the total amount of these impurities is at most 0.1 wt%. The minimum Al content in the aluminum alloy is 99.30 percent.

The aluminum alloys of the present invention may be manufactured according to the formulations according to methods known in the art. Common manufacturing methods include, for example:

1) casting, surface milling, annealing, hot rolling, cold rolling, annealing, cold rolling, stretch bending and straightening and packaging;

2) casting and rolling, cold rolling, stretch bending and straightening, and packaging.

The aluminum alloy plate/strip/foil can be used for CTP printing plates, bottle caps, curtain wall plates, decorative plates, electric appliance shells, heat exchangers, cable cladding, industrial extrusion coil pipes and hoses, tobacco powder, nameplates, light reflecting devices, heat insulation aluminum foils and the like.

The aluminum alloys of the present invention are particularly useful in the manufacture of aluminum alloy sheets/strips/foils for use in printing plate making, including process-free printing plates. Thus, the present invention also provides a method for manufacturing an aluminium alloy plate/strip/foil for printing plate making, characterized by comprising the steps of:

1) respectively adding the raw materials of the alloy into a smelting furnace, melting, refining in a heat preservation way, degassing, filtering and casting into a plate ingot with the thickness of about 500-650 mm;

2) sawing the head and the tail of the slab ingot, milling the surface, heating to about 500-600 ℃, keeping the temperature for about 2-12 hours, and discharging; hot rolling the slab ingot on a hot rolling mill into a strip of about 2.0 to about 5.0mm thickness; the finishing temperature is 250-320 ℃;

3) rolling the strip produced in step 2) on a cold mill to a thickness of about 1 to about 3mm, the rough roll work roll roughness should be Ra of about 0.30 to about 0.80 μm;

4) intermediate annealing the cold-rolled strip obtained in the step 3) in an annealing furnace at about 300 to about 450 ℃, and discharging the cold-rolled strip after heat preservation for about 2 to about 4 hours;

5) continuously rough rolling the annealed cold-rolled strip obtained in step 4) on a cold rolling mill to a thickness of about 0.14 to about 0.50mm to obtain a strip or foil having a surface roughness Ra of about 0.15 to about 0.30 μm;

6) and (3) cleaning, trimming, stretch bending and straightening the belt material obtained in the step 5) to obtain the aluminum alloy belt for printing plate making.

In one embodiment, the temperature of the smelting furnace in step 1) is from about 720 to about 740 ℃. The thickness of the slab ingot is preferably not less than about 520 mm. The thickness of the slab ingot is preferably no greater than about 620 mm.

Accordingly, the present invention also provides an aluminium alloy article for printing plate making, such as a plate/strip/foil, comprising an aluminium alloy according to the present invention, produced by the above manufacturing method.

In one embodiment, the alloy strip has a thickness of about 0.27 mm.

In one embodiment, the aluminum alloy strip has a tensile strength of about 175 to about 210MPa at room temperature, preferably about 185 MPa. In one embodiment, the aluminum alloy strip has a yield strength of about 170 to about 200MPa at room temperature, preferably a yield strength of about 180 MPa. In one embodiment, the aluminum alloy strip has an elongation of about 2 to about 6% at room temperature, preferably an elongation of about 2 to about 3.5%.

In one embodiment, the aluminum alloy strip is subjected to simulated baking conditions at a temperature of 240 ℃ for 10 minutes, and after cooling the aluminum alloy strip has a tensile strength of from about 145 to about 175MPa, preferably from about 160 to about 175MPa or from about 160 to about 170 MPa; a yield strength of about 135 to about 155MPa, preferably about 140 to about 150 MPa; and/or an elongation of about 3 to about 8%, preferably about 3 to about 6%.

The technical scheme of the invention realizes beneficial technical effects, including but not limited to, for example, the technical scheme of the invention can adopt relatively low homogenization temperature to complete the complete conversion of a non-equilibrium phase from an equilibrium phase, thereby improving the utilization efficiency of the heating furnace and saving oil gas consumption; according to the technical scheme of the invention, the intermetallic compound which is uniformly dispersed is precipitated, so that electrolytic coarsening generating points are increased, and the electrolytic coarsening is uniformly and quickly carried out, the electrolytic voltage is reduced, and the electrolytic energy consumption is saved; the technical scheme of the invention causes clean surface quality, can greatly improve the electrolytic pretreatment efficiency and save acid and alkali consumption; and the technical scheme of the invention causes high-strength mechanical property, so that the plate can be quickly printed, the production efficiency is improved, and the excellent plate baking performance greatly increases the printing resistance.

Examples

The invention will now be illustrated by the following examples, which are not intended to be limiting.

Materials:

electrolytic aluminum ingot Al99.70, available from the aluminum industry of China

AMG grain refiner, available from London and Scandinavian metallurgy Ltd, UK

Master alloy, 80Fe, 20Si, 50Cu, Ti5, available from Jiangxi permanent

Instruments and test methods:

hydrogen measuring instrument: HMA0100D, obtained from ABB, was used to detect the melt hydrogen content.

A slag measuring instrument: PZM0700D, obtained from ABB, was used to detect melt slag content.

Scanning electron microscope: EVO18, available from Zeiss, germany, detection method secondary electrons, backscatter.

Microscope: a2m from Zeiss, germany, detection method bright field, polarized light.

Roughness meter: hommel Tester W55, obtained from Hommel, Germany, for roughness and Burr measurements

A micrometer: mitutoyo, available from japan, for thickness measurement.

A tensile testing machine: CMT6203/6503 electronic universal tensile testing machine, obtained from MTS in USA, and the detection method refers to GB 228-.

Example 1:

the aluminium alloy strip according to the invention was produced according to the following method, with the example recipes shown in table 1:

(1) the material is prepared in the burdening stage as follows: 99.7 kg of aluminum ingot 108000kg (containing 40kg of Si element, 194kg of Fe element, 1.1kg of Mg element and 0.5kg of Cu element), 15kg of AlSi20 alloy, 230kg of 80Fe agent, 63.5kg of Mg ingot and 7.6kg of AlCu50 alloy are added into a smelting furnace for smelting, the smelting temperature is controlled at 750 ℃, the components are listed in Table 1 after refining, deslagging, stirring, analyzing and adjusting the components, the components enter a standing furnace, and are subjected to standing, refining, degassing and deslagging, Al-5Ti-1B wires (1.2-1.4 kg/t of molten aluminum) are added into molten aluminum and then enter a casting machine for casting into ingots, and the casting process parameters are as follows: controlling the casting temperature to be 705 ℃;

(2) controlling the hot rolling heating heat preservation temperature at 580 ℃ and the metal heat preservation time for 2 hours;

(3) the initial rolling temperature of hot rolling is controlled at 520 ℃, the final rolling temperature is controlled at 320 ℃, and the thickness of the final rolled blank is controlled at 4.2 mm;

(4) the hot rolled blank is rolled to the intermediate thickness of 2.0mm by 1 pass;

(5) intermediate annealing with the thickness of 2.0mm, controlling the temperature at 450 ℃, and keeping the temperature of the metal for 2 hours;

(6) after intermediate annealing, the product is rolled to the thickness of 0.27mm by 3 passes.

Example 2:

(1) the material is prepared in the burdening stage as follows: 99.7 kg of aluminum ingot 104000kg (containing 52kg of Si element, 198kg of Fe element and 1.5kg of Mg element), 156kg of AlSi20 alloy, 220kg of 80Fe agent, 102kg of Mg ingot and 8.3kg of AlCu50 alloy are added into a smelting furnace for smelting, the smelting temperature is controlled at 750 ℃, the components are listed in Table 1 after refining, deslagging, stirring, analyzing and adjusting the components, the components enter a standing furnace, standing, refining, degassing and deslagging are carried out, Al-5Ti-1B wires (1.2-1.4 kg/t of aluminum water) are added into molten aluminum, and then the molten aluminum enters a casting machine for casting into ingots, and the casting process parameters are as follows: controlling the casting temperature to be 705 ℃;

(2) controlling the hot rolling heating heat preservation temperature at 550 ℃ and the metal heat preservation time for 2 hours;

(3) the initial rolling temperature of hot rolling is controlled at 500 ℃, the final rolling temperature is controlled at 320 ℃, and the thickness of the final rolled blank is controlled at 4.2 mm;

(5) intermediate annealing with the thickness of 2.0mm, controlling the temperature at 420 ℃, and keeping the temperature of the metal for 2 hours;

Example 3:

(1) the material is prepared in the burdening stage as follows: 99.7 kg of aluminum ingot 116000kg (containing 58kg of Si element, 224kg of Fe element, 1.2kg of Mg element and 1.6kg of Cu element), 116kg of AlSi20 alloy, 184kg of 80Fe agent, 91.6kg of Mg ingot and 15.3kg of AlCu50 alloy are added into a smelting furnace for smelting, the smelting temperature is controlled at 770 ℃, the components are listed in Table 1 after refining, deslagging, stirring, analyzing and adjusting the components, the components enter a standing furnace, and are subjected to standing, refining, degassing and deslagging, Al-5Ti-1B wires (1.2-1.4 kg/t of molten aluminum) are added into molten aluminum and then enter a casting machine for casting into ingots, and the casting process parameters are as follows: controlling the casting temperature at 720 ℃;

(2) the hot rolling heating heat preservation temperature is controlled at 520 ℃, and the metal heat preservation time is 4 hours;

(3) the initial rolling temperature of hot rolling is controlled to be 480 ℃, the final rolling temperature is controlled to be 320 ℃, and the thickness of a final rolled blank is controlled to be 4.5 mm;

(4) rolling the hot rolled blank to the intermediate thickness of 2.2mm by 1 pass;

(5) 2.2mm thick intermediate annealing, controlling the temperature at 390 ℃, and keeping the metal temperature for 4 hours;

Example 4:

(1) the material is prepared in the burdening stage as follows: 110000kg of 99.7 aluminum ingots (containing 53kg of Si element, 208kg of Fe element, 0.7kg of Mg element and 0.6kg of Cu element), 175kg of AlSi20 alloy, 235kg of 80Fe agent, 98kg of Mg ingots and 20.5kg of AlCu50 alloy are added into a smelting furnace for melting, the smelting temperature is controlled at 770 ℃, the compositions of the components are listed in Table 1 after refining, deslagging, stirring, analyzing and adjusting the components, the components are put into a standing furnace, and Al-5Ti-1B wires (1.2-1.4 kg/t of aluminum water) are added into molten aluminum and then put into a casting machine for casting into ingots, wherein the casting process parameters are as follows: controlling the casting temperature at 720 ℃;

(2) controlling the hot rolling heating heat preservation temperature at 520 ℃, and preserving the metal heat for 6 hours;

(5) intermediate annealing with the thickness of 2.2mm, controlling the temperature at 360 ℃, and keeping the temperature of the metal for 6 hours;

Example 5:

(1) the material is prepared in the burdening stage as follows: 99.7 kg of aluminum ingot 108000kg (containing 42kg of Si element, 198kg of Fe element, 1.7kg of Mg element and 0.6kg of Cu element), 276kg of AlSi20 alloy, 238kg of 80Fe agent, 127kg of Mg ingot, 18.2kg of AlCu50 alloy and 73kg of AlTi20 alloy are added into a smelting furnace for smelting, the smelting temperature is controlled at 770 ℃, the components are listed in Table 1 after refining, deslagging, stirring, analyzing and adjusting the components, the components enter a standing furnace, standing, refining, degassing and deslagging are performed, Al-5Ti-1B (1.2-1.4 kg/t of aluminum water) wires are added into molten aluminum, and then the molten aluminum enters a casting machine for casting into ingots, and casting process parameters are as follows: controlling the casting temperature at 720 ℃;

(2) the hot rolling heating heat preservation temperature is controlled at 520 ℃, and the metal heat preservation time is 8 hours;

(4) rolling the hot rolled blank to the intermediate thickness of 2.5mm by 1 pass;

(5) intermediate annealing with the thickness of 2.5mm, controlling the temperature at 380 ℃, and keeping the metal temperature for 8 hours;

Table 1:

examples	Si	Fe	Mg	Ti	Cu	Other individual impurities	Aluminium
								1	0.04	0.35	0.06	0.015	0.004	<0.03	Balance of
2	0.08	0.36	0.10	0.015	0.004	<0.03	Balance of
								3	0.07	0.32	0.08	0.015	0.008	<0.03	Balance of
4	0.08	0.36	0.09	0.012	0.01	<0.03	Balance of
								5	0.09	0.36	0.12	0.020	0.009	<0.03	Balance of

Example 6:

the aluminum alloy strips obtained in examples 1 to 5 were subjected to grain texture analysis (roughness analysis) in which the product of the present invention (specification 500 mm. times. aluminum coil width) was cut out and averaged at multiple points along the direction perpendicular to the rolling direction using a Hommel Tester W55 roughness meter.

The product of the invention is tested and tested, and the result is shown in the following table 2:

table 2:

sample (I)	Ra（um）	Rz（um）	Rsk	Rku	Rpk（um）	Rk（um）	Rvk（um）
								1050	0.23	2.21	0.60	3.40	0.39	0.70	-0.18
Example 1	0.19	1.51	0.45	3.01	0.33	0.64	-0.17
								Example 2	0.19	1.24	0.57	3.05	0.38	0.68	-0.18
Example 3	0.20	1.60	0.55	2.98	0.34	0.62	-0.15
								Example 4	0.17	1.35	0.49	3.12	0.34	0.69	-0.17
Example 5	0.18	1.58	0.60	2.99	0.37	0.69	-0.16

Example 7:

the graining images of the aluminum alloy belts obtained in examples 1-5 were compared to a control alloy belt made of a prior art 1050 alloy using SEM and interferometer.

The test conditions are as follows: the product obtained by the invention and 1050 alloy products in the prior art are subjected to electrolytic coarsening by adjusting different electrolytic parameters, the electrolytic conditions of 50m/min, 60m/min, 70m/min and 80m/min of production line speed are simulated, the surfaces with different electrolytic meshes are obtained, and the SEM multiplied by 250 experimental results are shown in figure 5. Another test condition was: the electrolytic grain surface obtained by the same method as described above, SEM 1000 times, and the experimental results are shown in FIG. 6.

It is clear that the present invention has less flat top, more complete graining and more fine structure than the control 1050 alloy plate under the test conditions of 50 and 60m/min simulated line speed.

The MPA and MPD results of the grainy image analysis are specifically summarized in table 3 below:

TABLE 3

Example 8:

the aluminum alloy strips obtained in examples 1-5 were compared with the gritty electrolyte of a control strip made of a prior art 1050 alloy using SEM and interferometer, and the product obtained according to the invention and the prior art 1050 alloy product were immersed in a 34g/L NaOH solution for a certain period of time, washed with tap water and then etched in a 15g/L (HCl) + 15g/L (SO 42-) solution.

The test conditions are as follows: the corrosion attack after 5 seconds degreasing treatment, SEM x 40 times, the experimental results are shown in FIG. 7. Another test condition was: corrosion attack after 5 seconds of degreasing treatment: SEM 250 times, the experimental results are shown in FIG. 8.

Figures 7 and 8 are photographed by different multiples and show that the resulting product of the present invention has fewer erosion points and relatively shallow erosion tunnels than the surface of the prior art 1050 alloy product.

Example 9:

comparing the zeta potential test (OCP) of the aluminium alloy strips obtained in examples 1-5 with that of a control alloy strip made of 1050 alloy of the prior art, the product obtained by the invention and the 1050 alloy product of the prior art were corroded in a specific electrolyte, and the open-circuit potential and the corrosion potential difference were measured by measuring the polarization curve.

The results are specifically summarized in table 4 below:

TABLE 4

Example 10:

mechanical properties of the aluminum alloy strips obtained in examples 1-5 were compared to those of a control strip made from a prior art 1050 alloy. The tensile property and the crack resistance are tested by an electronic universal tensile testing machine and a cold bending test respectively. The mechanical property of the unfired plate is tested according to the test method specified in GB/T228-; the cold bending test was carried out at room temperature according to the test method specified in GB/T15825.2-2008.

The results are specifically summarized in tables 5 and 6 below:

table 5: tensile property: baked and unbaked plate

Table 6: crack resistance test

Example 11:

the degreasing kinetics of the aluminum alloy belts obtained in examples 1-5 were compared with those of the comparative alloy belt made of the prior art 1050 alloy. Weighing the product obtained by the invention in unit area and the alloy product 1050 in the prior art by using an electronic balance, then putting the product into caustic soda emulsion with certain concentration for corrosion for a period of time, taking out the product, washing the product with clear water, drying the product and then weighing the product, and calculating the weight loss of the sample in unit time, wherein the test conditions comprise that the surface of the sample is clean, the corrosion solution is 34g/l NaOH at 70 ℃, and the corrosion time is 5 seconds.

The results are specifically summarized in table 7 below:

TABLE 7

Claims

1. Aluminium alloy comprising Al, Si, Fe, Mg, Cu, Ti and optionally other impurities, characterized in that the weight contents of these components are as follows: si: 0.04-0.1%, Fe: 0.2-0.4%, Mg: 0.055-0.12%, Cu: 0.004 to 0.01%, Ti: 0.003-0.02%; the single weight content of the other impurities is not more than 0.03%; the balance being Al.

2. The aluminum alloy of claim 1, characterized in that Mg/Fe > = 0.125.

3. Aluminium alloy according to claim 1, characterized in that the content of Mg is not less than 0.06%, still preferably not less than 0.07%; and/or the content of Mg is not higher than 0.11%, still preferably not higher than 0.10%.

4. An aluminium alloy according to claim 1, characterized in that the content of Cu is not less than 0.0045%, still preferably not less than 0.005%; and/or the content of Cu is not higher than 0.009%, and more preferably not higher than 0.008%.

5. An aluminium alloy according to claim 1, characterized in that the content of Ti is not less than 0.004%, still preferably not less than 0.005%; and/or the content of Ti is not higher than 0.019%, and preferably not higher than 0.017%.

6. The aluminum alloy of claim 1, wherein the impurities comprise Li, Na, Pb, Be, Zn, and/or V.

7. An aluminium alloy according to claim 1, characterized in that the total amount of impurities is at most 0.1 wt.%.

8. An aluminium alloy according to claim 1, characterized in that the Al content is at least 99.30%.

9. An aluminum alloy article comprising the aluminum alloy of claim 1.

10. An aluminium alloy product according to claim 9, characterized in that the product is in the form of a strip, foil or plate.

11. Aluminium alloy article according to claim 10, characterized in that the thickness of the aluminium alloy sheet/strip/foil is about 0.14mm to about 0.5mm, preferably e.g. about 0.18mm to about 0.38 mm.

12. The aluminum alloy article of claim 9 or 10, characterized in that the aluminum alloy article has a tensile strength of about 175 to about 210MPa at room temperature, the aluminum alloy article has a yield strength of about 170 to about 200MPa at room temperature, and/or the aluminum alloy article has an elongation of about 2 to about 6% at room temperature; and

the aluminum alloy article is subjected to simulated bake plate conditions at a temperature of 240 ℃ for 10 minutes, and after cooling, the aluminum alloy article has a tensile strength of about 145 to about 175MPa, a yield strength of about 135 to about 155MPa, and/or an elongation of about 2 to about 8%.

13. Use of the aluminum alloy article of claim 9 or 10 for printing plate making.

14. A method of manufacturing an aluminium alloy sheet/strip/foil for use in printing plate making using an aluminium alloy according to claim 1, characterised in that the method comprises the steps of:

1) separately charging the alloy composition of claim 1 into a melting furnace, melting, refining, deslagging, degassing, filtering, and casting into slab ingots having a thickness of about 500 to about 650 mm;

3) rolling the strip on a cold mill to about 1 to about 3mm, the rough work roll roughness should be Ra about 0.30 to about 0.80 μm;

5) continuing to roll the annealed cold-rolled strip obtained in step 4) on a cold-rolling mill to a thickness of about 0.14 to about 0.50 mm; ra about 0.15 to about 0.30 μm;

6) and (3) cleaning, trimming, stretch-bending and straightening the strip obtained in the step 5) to prepare the aluminum alloy plate, strip and foil.