What is the purpose of trivalent chromium blue zinc water passivation in the alkaline galvanizing process?
1. Enhance the corrosion resistance of the galvanized coating
As zinc is an amphoteric metal, it reacts with both acids and bases. Zinc itself is not prone to natural passivation. In the atmosphere, the electro-galvanized layer is quickly corroded, eventually forming white basic zinc carbonate corrosion products and growing white ash and white fuzz. The main purpose of passivation is to enhance the anti-corrosion ability of the zinc coating. A good color dull layer can increase the anti-corrosion ability by 5 to 40 times.
2. Endow the workpiece with various tones and certain functions
Direct passivation can result in various tones such as rainbow, blue-white, silver-white, golden yellow, and black, depending on the passivation process. After passivation, coloring or dyeing can also obtain a richer variety of colors. Black passivation has functions such as matting and heat absorption. Different tones can be matched with the overall color of the machine, making the appearance more harmonious and beautiful, and achieving a certain decorative effect.
3. Enhance the brightness of the galvanized coating
Passivation in trivalent chromium blue zinc water with chemical polishing effect can simultaneously enhance the brightness of the galvanized layer.
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Guangdong Bigely Technology Co., Ltd. ,founded in 2003, is a high-tech enterprise integrating R & D，production, sales and service, specializing in the production of electroplating additives. As a famous electroplating additives source manufacturer in China, Bigely has over 20 years' experience in electroplating additives production and own production base of 5000 square meters. We can produce 15,000 tons of electroplating additives every year, which can fully meet the needs of customers.
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