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Technological process of aluminum plating

2022-07-19

Degreasing - > alkaline corrosion - > activation - > zinc replacement - > activation - > electroplating - > chromium plating or passivation - > drying
Application of common plating seeds
1) Black plating, such as black zinc, black nickel, etc., are used in optical electronics and medical devices.
2) Gold plating and silver plating are the best conductors of electronic products. At the same time, they can also improve the high decoration of products, but the price is relatively expensive. They are generally used in the conductivity of electronic products, such as the electroplating of high-precision wire terminals.
3) Copper, nickel and chromium are the most popular mixed plating species in the field of modern science. Both in terms of decoration and corrosion resistance, they are the most popular plating species in the world at present. It is cheap and can be used in sports equipment, lighting and most electronic industries.
4) Among the copper plating species, white tin copper is developed in the 1970s and 1980s for environmental protection. It is white and bright, and is the first choice in the jewelry industry. Bronze (lead tin copper can be used to imitate gold, so it is a better decorative plating species) but the anti tarnishing property of copper is relatively poor, so its development is relatively slow.
5) Zinc electroplating: the zinc coating is cyan white and soluble in acid and alkali. Since the standard potential of zinc is negative than that of iron, it can provide reliable electrochemical protection for steel. Zinc can be selected as the protective layer for steel products used in industrial atmosphere and marine atmosphere.
6) Hard chromium, the chromium coating deposited under certain conditions has high hardness and wear resistance, reaching hv900-1200kg/mm. Chromium is the coating with the highest hardness in common coatings, which can improve the wear resistance of parts and prolong the service life. Such as tooling, mold, measurement, fixture, etc. Therefore, this kind of plating is an indispensable treatment method for cylinder, oil pressure and transmission system.

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