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ã€China Aluminum Industry Network】 Aluminum and aluminum alloys can be electroplated in the electrolyte to form a coating, but the coating adhesion is not strong and easy to peel. Therefore, aluminum can be first deposited in the aqueous solution containing zinc oxide compounds and then electroplating, this method is either zinc displacement or deposition. It is also possible to first obtain a thin porous oxide film on the surface of aluminum and aluminum alloys by anodizing the power supply to perform electroplating.
Conventional aluminum and aluminum alloy plating process The aluminum and aluminum alloy plating process consists of three parts: pre-plating, electroplating, and post-plating. Pre-plating treatment is a relatively key process related to the quality of electroplated products. Its main purpose is to remove the grease on the surface of aluminum and aluminum alloys, naturally forming oxide films and other contaminants.
The conventional general process flow is: degreasing-washing-demineralization-washing-pickling-washing-activation-washing-primary zincation-washing-dezincification-washing-secondary zincation-washing-neutral nickel-plating-washing- Subsequent plating.
As the traditional pre-treatment of aluminum and aluminum alloys agrees with the above deficiencies, they must be improved.
Improved general-purpose aluminum and aluminum alloy electroplating pretreatment process Degreasing alkali etching combo-washing-pickling-washing-ashing-washing-alkaline activation-zinning-washing-neutral nickel plating-washing-sequential electroplating.
The new process aims at the actual defects of the current aluminum alloy electroplating, combined with the special physical and chemical properties of the aluminum alloy itself, and it is improved on the basis of the original technology, and the following advantages are as follows:
1. The process flow is short. By selectively dissolving other metals on the surface layer of the aluminum alloy, the purity of the aluminum alloy surface is improved, and the adhesion of the plating layer is improved.
2. Alkaline activation was used instead of the acid activation process to completely remove the residual silicon and silica gel on the surface of the rate alloy during the pre-plating process, effectively increasing the plating adhesion.
3. After alkaline activation without direct washing and direct zinc immersion, it can avoid the formation of an oxide layer by exposure to air in the acidic activation and secondary zinc immersion.
4. Just a simple zinc immersion can be, the bond strength of the coating is significantly better than the secondary zinc leaching and complex multi-component cyanogen leaching zinc process.
5. The versatility of the process is almost used for all types of aluminum alloy plating pretreatment.
6. The one-time pass rate of product electroplating is obviously higher than the traditional one. If the evaluation of the bond strength of a simple coating is good, the product's pass rate is close to 100%.
7. The actual production process is simple and convenient.
8. The actual production of a large-scale automatic production line for a long time has proved that the improved pretreatment of the new aluminum alloy plating is very stable.
9. Facilitate the process improvement based on the traditional aluminum alloy plating process.
10. The use of Haocheng aluminum oxidation power supply can achieve rapid increase in the film speed, shorten the film on time, save resources, to achieve cost-effectiveness.
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