Aluminum alloy die cast metal surface treatment method
Date：
2021-02-25
How much do you know about the metal surface treatment of aluminum alloy die casting electroplating process of hard chrome? Aluminum alloy die casting metal surface treatment technology has a high demand in the market, especially the electroplating process of hard chrome. Why aluminum alloy die casting electroplating process of hard chrome will have such a good reputation?
It is clear to develop a new energy-saving chemical polishing technology with phosphoric acid monosulfuric acid as the base liquid. In order to achieve zero NOx emission and get rid of the quality defects of similar technologies in the past, the key to the new technology is to add some chemical substances with special effects in the base liquid to replace nitric acid. For this reason, it is necessary to analyze the tri acid chemical polishing process of aluminum, especially the effect of nitric acid. The main effect of nitric acid in aluminum chemical polishing is to inhibit spot corrosion and improve polishing luster. Combined with the chemical polishing experiment in simple phosphoric acid sulfuric acid, it is felt that the special chemical substances added in phosphoric acid sulfuric acid should be able to inhibit spot corrosion and alleviate overall corrosion, At the same time, it must have good leveling and lighting effects
Electrochemical surface strengthening treatment of aluminum and its alloys_ 2WO_ 4. In the neutral mixed system, the concentration of the film forming accelerator is controlled to be 2.5 ～ 3.0g/l, and the concentration of the complexing film forming agent is 1.5 ～ 3.0g/l_ 2WO_ 4. The concentration value is 0.5 ～ 0.8g/l, the peak current density is 6 ～ 12A/dm~2, and weak stirring can obtain A complete, uniform and glossy gray series inorganic non-metallic film with a thickness of 5-10 μ m. The micro strength is 300~540HV, and the corrosion resistance is excellent. The neutral system has good adaptability to aluminum alloy, and the film can be formed on various series of aluminum alloys such as rust proof aluminum and forged aluminum
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