CN104611692A - Filming solution of magnesium alloy black conversion film and preparation method of conversion film - Google Patents
Filming solution of magnesium alloy black conversion film and preparation method of conversion film Download PDFInfo
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 230000004913 activation Effects 0.000 claims abstract description 12
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims abstract description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 8
- 238000004506 ultrasonic cleaning Methods 0.000 claims abstract description 8
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 229910000365 copper sulfate Inorganic materials 0.000 claims abstract description 6
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims abstract description 6
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000005554 pickling Methods 0.000 claims abstract description 6
- 150000003839 salts Chemical class 0.000 claims abstract description 6
- 239000002253 acid Substances 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 239000004115 Sodium Silicate Substances 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 10
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 239000001488 sodium phosphate Substances 0.000 claims description 5
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 5
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 5
- 238000007739 conversion coating Methods 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 11
- 238000005260 corrosion Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 3
- 239000003973 paint Substances 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 2
- 239000012153 distilled water Substances 0.000 description 12
- 239000008399 tap water Substances 0.000 description 6
- 235000020679 tap water Nutrition 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/68—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous solutions with pH between 6 and 8
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/82—After-treatment
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
一种镁合金黑色转化膜的成膜溶液及该转化膜的制备方法。其成膜溶液组成：马日夫盐50-60g/L、硝酸锌45-55g/L、硫酸铜1-2g/L、EDTA 0.5-1g/L、硝酸镍1-2g/L。其制备方法：1、机械打磨：用水磨砂纸打磨，除去镁合金表面污物；2、超声波清洗：放入丙酮溶液中超声波清洗；3、碱洗：用碱洗溶液清洗除去表面油污；4、酸洗：用酸液洗涤去除表面的氧化膜；5、活化：用活化液洗涤进一步除去氧化膜并形成活化位点；6、成膜：将前处理后的镁合金试样浸入到成膜溶液中，获得黑色转化膜；7、封闭处理：将形成黑色膜的镁合金试样放入封闭处理液中，将转化膜表面微孔封闭。利用本方法成功地制备出了镁合金黑色转化膜，膜层具有良好的耐蚀性和漆膜附着性，并且成膜溶液环保无污染。
A film-forming solution for a black conversion film on a magnesium alloy and a preparation method for the conversion film. The composition of the film-forming solution: 50-60g/L of Maziv salt, 45-55g/L of zinc nitrate, 1-2g/L of copper sulfate, 0.5-1g/L of EDTA, and 1-2g/L of nickel nitrate. Its preparation method: 1. Mechanical grinding: grinding with water abrasive paper to remove dirt on the surface of magnesium alloy; 2. Ultrasonic cleaning: ultrasonic cleaning in acetone solution; 3. Alkaline cleaning: cleaning with alkaline cleaning solution to remove surface oil; 4. Pickling: wash with acid solution to remove the oxide film on the surface; 5. Activation: wash with activation solution to further remove the oxide film and form activation sites; 6. Film formation: immerse the pretreated magnesium alloy sample into the film formation solution 7. Sealing treatment: put the magnesium alloy sample forming the black film into the sealing treatment solution to seal the micropores on the surface of the conversion film. The method successfully prepares a magnesium alloy black conversion film, the film layer has good corrosion resistance and paint film adhesion, and the film forming solution is environmentally friendly and pollution-free.
Description
技术领域 technical field
本发明属于表面处理技术领域，涉及镁合金表面耐腐蚀性黑色转化膜的成膜溶液组成和该黑色膜的制备方法。 The invention belongs to the technical field of surface treatment, and relates to the composition of a film-forming solution for a corrosion-resistant black conversion film on the surface of a magnesium alloy and a preparation method for the black film.
背景技术 Background technique
镁合金是目前工业应用的最轻的金属结构材料，具有许多优良的性能，它的比强度高、比刚度高、密度约为铝的2/3、铁的1/4；它具有良好的导热性、导电性、阻尼性、尺寸稳定性、减震性、机械加工性及再循环利用性，被认为是二十一世纪最具开发和应用潜力的绿色材料。但镁合金标准电极很负，导致其耐蚀性很低，这就限制了它的广泛应用。 Magnesium alloy is currently the lightest metal structure material used in industry, with many excellent properties, its specific strength, high specific stiffness, density is about 2/3 of aluminum, 1/4 of iron; it has good thermal conductivity Sex, conductivity, damping, dimensional stability, shock absorption, machinability and recycling are considered to be the green materials with the most development and application potential in the 21st century. However, the magnesium alloy standard electrode is very negative, resulting in low corrosion resistance, which limits its wide application.
化学转化膜是一种直接在钢铁、锌板、镁合金等金属表面通过成膜溶液中的离子与金属间发生化学反应而形成膜层。该技术可以使金属表面均匀的覆盖一层转化膜，并提高合金的耐蚀性和装饰性。镁合金经化学转化处理后，可以极大地提高其耐腐蚀性能。 Chemical conversion coating is a film formed directly on the surface of steel, zinc plate, magnesium alloy and other metals through the chemical reaction between ions in the film-forming solution and the metal. This technology can evenly cover the metal surface with a layer of conversion film, and improve the corrosion resistance and decorative properties of the alloy. Magnesium alloys can greatly improve their corrosion resistance after chemical conversion treatment.
发明内容 Contents of the invention
本发明的目的在于提供一种镁合金黑色转化膜的电化学制备方法。制得的转化膜呈黑色，此膜层可以提高镁合金的耐蚀性和漆膜附着性。 The purpose of the present invention is to provide an electrochemical preparation method of a magnesium alloy black conversion film. The obtained conversion film is black, and the film layer can improve the corrosion resistance and paint film adhesion of the magnesium alloy.
采用的技术方案是： The technical solutions adopted are:
一种镁合金黑色转化膜的电化学制备方法，具体制备方法如下： An electrochemical preparation method of a magnesium alloy black conversion film, the specific preparation method is as follows:
（1）机械打磨：用600#、800#、1000#或1200#水磨砂纸打磨，除去镁合金表面污物，使镁合金表面光滑； (1) Mechanical grinding: Grinding with 600#, 800#, 1000# or 1200# water-grinding sandpaper to remove the dirt on the surface of the magnesium alloy and make the surface of the magnesium alloy smooth;
（2） 超声波清洗：将镁合金试样放入丙酮溶液中超声波清洗，以洗去表面的污物，超声波频率为25KHz～130KHz； (2) Ultrasonic cleaning: Put the magnesium alloy sample into the acetone solution for ultrasonic cleaning to wash away the dirt on the surface. The ultrasonic frequency is 25KHz～130KHz;
（3）碱洗：用碱洗溶液清洗，温度为70-80℃，时间为5min，除去表面油污； (3) Alkali washing: Wash with alkaline washing solution at a temperature of 70-80°C for 5 minutes to remove surface oil;
（4）酸洗：用酸液洗涤，常温，时间为30s，去除表面的氧化膜； (4) Pickling: wash with acid solution at room temperature for 30s to remove the oxide film on the surface;
（5）活化：用活化液洗涤，常温，时间为60-120s，进一步除去氧化膜并形成活化位点； (5) Activation: Wash with activation solution at room temperature for 60-120s to further remove the oxide film and form activation sites;
（6）成膜：将前处理后的镁合金试样浸入到成膜溶液中，温度为常温，处理时间为8-10min，即可获得黑色转化膜； (6) Film formation: immerse the pretreated magnesium alloy sample into the film formation solution, the temperature is normal temperature, and the treatment time is 8-10min, and the black conversion film can be obtained;
（7）封闭处理：将形成黑色膜的镁合金试样放入封闭处理液中，温度为95-100℃，时间为10min，将转化膜表面微孔封闭，即得。 (7) Sealing treatment: put the magnesium alloy sample that has formed a black film into the sealing treatment solution at a temperature of 95-100°C for 10 minutes, and seal the micropores on the surface of the conversion coating.
成膜液由马日夫盐、硝酸锌、硫酸铜、EDTA、硝酸镍和水组成。 The film-forming solution is composed of Mazoff salt, zinc nitrate, copper sulfate, EDTA, nickel nitrate and water.
成膜液的浓度为： The concentration of the film-forming solution is:
马日夫盐50-60g/L、硝酸锌45-55g/L、硫酸铜1-2g/L、EDTA 0.5-1g/L、硝酸镍1-2g/L。 Marif salt 50-60g/L, zinc nitrate 45-55g/L, copper sulfate 1-2g/L, EDTA 0.5-1g/L, nickel nitrate 1-2g/L.
所述的碱洗溶液包括磷酸钠、碳酸钠、氢氧化钠和硅酸钠溶液，其浓度分别为磷酸钠40-50g/L、碳酸钠10-15g/L、氢氧化钠40-50g/L、硅酸钠5-10g/L。 Described alkali cleaning solution comprises sodium phosphate, sodium carbonate, sodium hydroxide and sodium silicate solution, and its concentration is respectively sodium phosphate 40-50g/L, sodium carbonate 10-15g/L, sodium hydroxide 40-50g/L , Sodium silicate 5-10g/L.
所述的酸洗液为37.5%(v/v)的浓磷酸（85%）稀释溶液。 The pickling solution is a diluted solution of 37.5% (v/v) concentrated phosphoric acid (85%).
所述的活化溶液为35%(v/v)的氢氟酸（40%）稀释溶液。 The activation solution is a 35% (v/v) diluted solution of hydrofluoric acid (40%).
所述的封闭处理液包括硅酸钠或氢氧化钠，其浓度分别为硅酸钠25-30g/L、氢氧化钠5-10g/L。 The sealing treatment solution includes sodium silicate or sodium hydroxide, the concentrations of which are 25-30 g/L of sodium silicate and 5-10 g/L of sodium hydroxide.
本发明工艺简单，制得的转化膜是黑色，该膜能提高镁合金的耐蚀性和漆膜的附着性。 The process of the invention is simple, and the obtained conversion film is black, and the film can improve the corrosion resistance of the magnesium alloy and the adhesion of the paint film.
附图说明 Description of drawings
图1是镁合金转化膜和基体极化曲线对比图。 Figure 1 is a comparison of the polarization curves of the magnesium alloy conversion coating and the substrate.
具体实施方式 Detailed ways
以下结合实施例对本发明的技术方案作进一步的描述。 The technical solutions of the present invention will be further described below in conjunction with the examples.
采用的样品为AZ91D镁合金。 The sample used is AZ91D magnesium alloy.
实施例1 Example 1
1、机械打磨处理 1. Mechanical grinding
将上述镁合金用600#、800#、1000#、1200#水磨砂纸打磨露出新鲜镁合金基体，然后用自来水、蒸馏水冲洗干净，吹干。 Grind the above magnesium alloy with 600#, 800#, 1000#, 1200# water-grinding sandpaper to expose the fresh magnesium alloy matrix, then rinse it with tap water or distilled water, and blow dry.
2、超声波清洗 2. Ultrasonic cleaning
将镁合金试样放入丙酮溶液中超声波清洗（40KHz），以洗去表面的污物。 Put the magnesium alloy sample into the acetone solution for ultrasonic cleaning (40KHz) to wash away the dirt on the surface.
3、碱洗 3. Alkaline washing
将磷酸钠40g、碳酸钠10g、氢氧化钠50g、硅酸钠5g依次放入800mL的蒸馏水中，待各物质全部溶解后添加蒸馏水至1L配成碱洗溶液。将上述清洗后的试样放入碱洗溶液中，温度控制在80℃，时间为5min。然后用自来水和蒸馏水将试样清洗干净。 Put 40g of sodium phosphate, 10g of sodium carbonate, 50g of sodium hydroxide, and 5g of sodium silicate into 800mL of distilled water in turn. After all the substances are dissolved, add distilled water to 1L to make an alkali washing solution. Put the above-mentioned cleaned samples into the alkaline cleaning solution, the temperature is controlled at 80°C, and the time is 5 minutes. The samples were then rinsed with tap water and distilled water.
4、酸洗 4. Pickling
将上述碱洗后的试样浸入到37.5%(v/v)的浓磷酸（85%）稀释溶液中，常温条件下处理30s。然后用自来水和蒸馏水将试样清洗干净。 Immerse the above-mentioned alkali-washed sample in a diluted solution of 37.5% (v/v) concentrated phosphoric acid (85%), and treat it for 30s at room temperature. The samples were then rinsed with tap water and distilled water.
5、活化 5. Activation
将上述酸洗后的试样浸入到35%(v/v)的氢氟酸（40%）的稀释溶液中，常温条件下处理100s。然后用自来水将试样清洗干净，再用蒸馏水清洗，吹干。 Immerse the above acid-washed sample in a diluted solution of 35% (v/v) hydrofluoric acid (40%), and treat it for 100s at room temperature. Then clean the sample with tap water, rinse with distilled water, and blow dry.
6、成膜 6. Film formation
将马日夫盐60g、硝酸锌50g、硫酸铜1g、EDTA 0.8g、硝酸镍1g依次放入800mL的蒸馏水中，待各物质全部溶解后添加蒸馏水至1L配成成膜溶液。将上述经过前处理的镁合金试样常温条件下浸入到成膜溶液中，反应时间为8min。然后用自来水将试样清洗干净，再用蒸馏水清洗，吹干。 Put 60g of Mariv's salt, 50g of zinc nitrate, 1g of copper sulfate, 0.8g of EDTA, and 1g of nickel nitrate into 800mL of distilled water in sequence. After all the substances are dissolved, add distilled water to 1L to form a film-forming solution. The above-mentioned pretreated magnesium alloy sample was immersed in the film-forming solution at room temperature, and the reaction time was 8 minutes. Then clean the sample with tap water, rinse with distilled water, and blow dry.
7、封闭处理 7. Closed treatment
将硅酸钠30g、氢氧化钠5g放入800mL的蒸馏水中，待各物质全部溶解后添加蒸馏水至1L配成封闭处理溶液。将上述成膜试样浸入封闭处理溶液中，温度控制在95℃下处理5min。将封闭处理后的试样用自来水清洗干净，再用蒸馏水清洗，吹干。 Put 30 g of sodium silicate and 5 g of sodium hydroxide into 800 mL of distilled water, and after all the substances are dissolved, add distilled water to 1 L to prepare a sealing treatment solution. The above-mentioned film-forming sample was immersed in the sealing treatment solution, and the temperature was controlled at 95° C. for 5 minutes. Clean the sealed sample with tap water, then with distilled water, and dry it.
最后制得了黑色的镁合金转化膜，该附有黑色转化膜的镁合金耐蚀性明显提高了。 Finally, a black magnesium alloy conversion film is obtained, and the corrosion resistance of the magnesium alloy with the black conversion film is obviously improved.
性能检测 performance testing
耐蚀性测试 Corrosion Test
采用上海晨华仪器公司生产的CHI660E型电化学工作站来测试转化膜的稳态电流-电位（I-E）极化曲线。参比电极用饱和甘汞电极，辅助电极用铂电极，工作电极用待测试试样，扫描速率为2.5mV/s。测试结果如图1所示。结果表明形成转化膜后的镁合金腐蚀电位较镁合金基体明显正移了，腐蚀电流也明显下降了，说明转化膜对镁合金有很好的保护作用。 The CHI660E electrochemical workstation produced by Shanghai Chenhua Instrument Co., Ltd. was used to test the steady-state current-potential (I-E) polarization curve of the conversion film. A saturated calomel electrode was used as the reference electrode, a platinum electrode was used as the auxiliary electrode, and the sample to be tested was used as the working electrode, and the scan rate was 2.5mV/s. The test results are shown in Figure 1. The results show that the corrosion potential of the magnesium alloy after the formation of the conversion film is obviously shifted positively compared with the magnesium alloy substrate, and the corrosion current is also significantly decreased, which shows that the conversion film has a good protective effect on the magnesium alloy.
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| CN114134496A (en) * | 2021-09-28 | 2022-03-04 | 河南北方红阳机电有限公司 | Alkali-free oxidation process suitable for high-strength steel and copper alloy combination |
| CN114134496B (en) * | 2021-09-28 | 2023-09-05 | 河南北方红阳机电有限公司 | Alkali-free oxidation process suitable for high-strength steel and copper alloy combination |
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