CN88103137A - Cloisonne on aluminum base - Google Patents

Abstract

The invention belongs to surface treatment technology. This scheme provides the technological process of making imitation cloisonné on the aluminum billet. It uses the method of secondary oxidation and tertiary coloring of aluminum, and its process generally includes: pretreatment of aluminum billet→electropolishing→sulfuric acid anodizing treatment→dyeing gold→printing→corrosion→porcelain oxidation→secondary dyeing→dye discharge. Its characteristics maintain the style of cloisonné, suitable for mass production, low cost, wide application range, and can be used for surface decoration of medium and high-end daily necessities, handicrafts, household appliances and other products.

Description

Aluminum cloisonne

The present invention belongs to the field of surface treatment technology for obtaining special artistic effect, and relates to a technological process for imitating aluminium cloisonne on aluminium blank.

Cloisonne is a traditional technique peculiar to China, is formed in Beijing area during the Ming Dynasty cloisonne, is formed by welding copper wire patterns on a copper tire, filling enamel colored glaze, sintering and then gilding the protruded pattern part on the surface, and the enamel colored glaze is mostly blue so as to be called cloisonne. It is luxurious and elegant, so it is rather popular among all people today and abroad. This process is a manual operation and therefore costly and low throughput. The surface decoration treatment for making imitation cloisonne enamel (short for cloisonne enamel) on aluminium blank is to improve the anodic oxidation process of aluminium blank and to make the effect similar to that of aluminium enamel by using secondary oxidation and three-time colouring method. According to the search, no complete process for manufacturing aluminum cloisonne on aluminum products is found, and both U.S. patents obtained in the search have similar local processes, (1) U.S. Pat. No. 4, 4021315 'process for anodizing and electrolytically coloring aluminum or aluminum alloy body', and (2) U.S. Pat. No. 3, 4375391 'manufacturing method for coloring aluminum polyhedron with two colors'. (1) The aluminum or aluminum alloy object is first anode oxidized in sulfuric acid or arylsulfonic acid containing tank and then cathode in metal salt and boric acid containing electrolytic bath, and is painted through DC electrolysis. The method is characterized in that only one color can be printed, the color is uniform, the color can be changed by replacing metal salt, and the two steps of operations can be repeated for deepening the coloring.

(2) And (3) soaking the black-colored substrate in an acid solution for activation treatment and anodic oxidation treatment, and then coloring the substrate with a decorative bright color by using some anode oxidation and coloring technical arrangements. It features that it can be colored in two colors, and uses the rib of polygon as boundary, so there is no measure and effect of artistic pattern.

The invention aims to provide a process operation for realizing special technical effect of cloisonne-imitating cloisonne on an aluminum blank, fully exerting the skill of electrochemical reaction, and adopting the technical processes of secondary oxidation and tertiary coloring. The scheme has the characteristics of realizing batch production and reducing cost so as to meet the requirements of consumption levels of different levels.

According to the conception, the process method for manufacturing the imitation cloisonne on the surface of the aluminum blank adopts the processes of secondary oxidation and tertiary coloring, and the process flow is as follows: aluminum blank → polishing → degreasing → electropolishing → sulfuric acid anodizing → dyeing gold → sealing → printing → inspection → corrosion → porcelain oxidation → second dyeing → discharge → sealing → inspection → polishing.

The specification of each process in the aluminum cloisonne process is as follows:

1. electrolytic polishing: 85-90% of phosphoric acid, 15-10% of chromic acid and the balance of distilled water, the temperature is 80-105 ℃, and the current density is 10-30A/dm²Lead plates for cathodes were used for 60 seconds × 4 times. The purpose is to improve the surface condition of the part and achieve the mirror finish.

2. Anodic oxidation of sulfuric acid: 16 to 18 percent of sulfuric acid and the balance of distilled water, the temperature is 5 to 10 ℃, and the current density is 0.4 to 0.6A/dm²And the time is 45-60 minutes. The method aims to form a bright and transparent aluminum oxide film with pores on the surface of an aluminum blank so as to adsorb dye, increase the hardness, protect parts and prevent corrosion and abrasion.

3. Dyeing golden color: the dye is 10% of alizarin yellow or 0.08g/l of signet-earth: 5-10% of potassium permanganate, 3-5 ml/l of sulfuric acid, and the balance of distilled water at room temperature. The purpose is to make the dye adsorbed on the oxide film golden yellow.

4. And (3) corrosion: 5-10% of caustic soda, 80-100 ℃ of temperature and 20-30 seconds of time. The purpose is to remove the first oxide film of the unprinted parts.

5. Oxidation of porcelain: 30-40 g/l chromic acid, 2-3 g/l boric acid, 38-45 ℃, 60 minutes time and 1-1.2A/dm current density²Electricity, electricityThe pressure is 45-60V. The purpose is to form a porcelain oxide film on the unprinted parts.

6. And (3) secondary dyeing, namely adopting a high-temperature dyeing process: the dye is acid intermediate blue B10%, direct brown BN10% or other colors, the temperature is 40-50 ℃, and the time is 5 minutes. The purpose is to color the porcelain oxide film.

7. Discharge dyeing, i.e. third coloring: 50-80% of chromic acid, 10-30% of sulfuric acid and the balance of distilled water, and the temperature is room temperature and the time is 10-20 minutes. The aim is to remove the color dyed by the part needing to be dyed for the second time, and restore the original milk white color to form a third color.

In the printing process, after golden is dyed, a special printing machine is used for printing the flowers of the printing ink on the surface, and the parts covered by the printing ink are golden edges and golden flowers left on the surface of a finished product. The technological process includes twice sealing treatment, including steam sealing treatment in available technology, washing dyed oxide film with water and sealing treatment, and aims at fixing dye in the film to raise the anticorrosive capacity and color fastness of the film. The etching after printing is to remove the oxide film outside the ink covering part to lower the etched surface by several microns, and then to oxidize the ceramic on the lower surface to form smooth, glossy, high-hardness and opaque ceramic oxide film, which is colored for the second time and the third time in local area. And finally, after the finish polishing is closed, the cloisonne imitating effect with the protruded golden pattern is formed.

The process of the invention has the advantages that: the method has the advantages of fully playing the electrochemical treatment technology, obtaining the effect and the style of the antique and antique color of the cloisonne by a mechanical batch production method, greatly reducing the cost by replacing aluminum with copper and coloring with gold plating, greatly reducing the cost which is one tenth of the cost of the manual cloisonne, improving the performance of the product which is higher than the manual cloisonne, having high surface hardness, wear resistance and corrosion resistance, having crisp and brittle colored glaze and afraid of the manual cloisonne, having non-wear-resistant gold plating surface of a convex part, improving and enriching the level of anodic oxidation of the aluminum product, widening the use field, having wide application range of the aluminum cloisonne process, and being capable of being used for surface decoration of various middle-high-grade artworks, daily necessities, household appliances and light-duty products.

Example (b): the initial implementation field of the scheme is that the scheme is used on a pen and a ball-point pen sleeve, and the prior technical scheme is proved to be stable and mature through experiments after being searched for many times for a long time. Four kinds of floral patterns are designed on the pen cap, including a cloisonne pattern with a little white color on the Murda flower, and a cloisonne pattern imitating the color pattern of brown or other colors. The technology has wide application range, and can be used for daily necessities such as lighters, vacuum cups and pens, artware, household appliances such as table lamps and table fans. The process is suitable for mass production, and can greatly reduce cost and meet the requirements of consumers of different levels.

Claims (6)

1. A processing method for making surface decoration imitating cloisonne on an aluminum billet, which is characterized in that it adopts a process of secondary oxidation and three colorings, and the process flow is as follows: aluminum blank → polishing → degreasing → electrolytic polishing → sulfuric acid Anodizing→golden dyeing→sealing→printing→inspection→corrosion→porcelain oxidation→second dyeing→discharge dyeing→sealing→inspection→finishing; among them, its second dyeing is a high-temperature dyeing process, and the specification is that the dye is Acidic medium bleach B10% or direct brown BN10% or other colors, activator acetic acid, strengthen stirring, temperature 40-50°C, time 5 minutes. Its discharge dyeing process specification is 50-80% of chromic acid, 10-30% of sulfuric acid, the rest of distilled water, the temperature is room temperature, and the time is 60-120 minutes. 2. According to the processing method of aluminum billet imitating cloisonne according to claim 1, it is characterized in that the specification of electrolytic polishing in its technological process is 85-90% phosphoric acid, 15-10% chromic acid, the remaining distilled water, and a temperature of 80 ~105°C, current density 10~30A/dm ² , lead plate for cathode, time 60 seconds x 4 times. 3. According to the processing method of aluminum billet imitating cloisonne according to claim 1, it is characterized in that the standard of sulfuric acid anodic oxidation in its technological process is 16-18% of sulfuric acid, and the remaining distilled water, temperature 5-10°C, current density 0.4-0.6A/dm ² , time 45-60 minutes. 4. According to the processing method of aluminum billet imitating cloisonne according to claim 1, it is characterized in that its process specification for dyeing gold is 10% dye Alizarin Yellow or Indixin Golden 0.08g/l Indixin Orange Yellow 0.28g/l, the rest distilled water, temperature at room temperature, time 30-60 seconds, color developing solution is potassium permanganate 5-10% sulfuric acid 3-5ml/l, the rest distilled water. 5. The processing method of aluminum billet imitating cloisonne according to claim 1, characterized in that the corrosion process specification in its process flow is 5-10% caustic soda, temperature 80-100°C and time 20-30 seconds. 6. According to the processing method of aluminum billet imitating cloisonne according to claim 1, it is characterized in that the process specification of porcelain oxidation in its process flow is chromic acid 30-40g/l, boric acid 2-3g/l, temperature 38-45°C, time 60 minutes, current density 1-1.2A/dm ² , voltage 45-60V.