In the production process of trivalent chromium color passivation, the gloss of the passivation film is one of the important indicators of its quality. However, the problem of poor passivate film gloss is often encountered in practice. This phenomenon involves a variety of factors, including the composition of the trivalent chromium colored zinc passivator, the quality of the plating layer, and the control of the passivation process.
First of all, the composition of the trivalent chromium colored zinc passivator has a crucial influence on the gloss of the passivate film. The concentration of trivalent chromium ions in the passivate solution directly affects the film formation reaction. When the trivalent chromium concentration is low, the film formation speed is slow, the passivate film is thin and easy to color, the gloss is naturally poor; with the trivalent chromium concentration increases, the film formation speed is accelerated, the film thickness increases, the gloss will be improved; but the concentration is too high, the film formation speed is too fast resulting in yellowing of the film layer, the surface is loose, the same will reduce the gloss.
Secondly, the quality of the plating layer is also an important factor affecting the gloss of the passivation film. The flatness, gloss and purity of the surface of the plating layer will affect the appearance of the passivated layer. If there are defects in the plating layer itself, such as roughness of the surface, lack of gloss or low purity, then the gloss of the passivated film will also be affected.
Furthermore, the control of the passivation process should not be overlooked. The time, temperature and degree of agitation of the passivation reaction must be strictly controlled to ensure the uniformity and appearance of the film. Loss of control in any one of these areas can result in a loss of passivation film gloss.
To solve these problems, Bigely trivalent chromium colored zinc passivator BZ-208 is recommended, which has good resistance to ferrous impurities and provides a pleasing iridescent coating appearance under normal operation. At the same time, BZ-208 performs well in improving the corrosion resistance of the coating, providing good surface protection and an attractive appearance.
About Bigely Technology
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, our products are widely used to meet the plating needs of different industries and exported to many countries from all over the world. They can meet the environmental protection standard after use, mainly used in automobile parts, sanitary ware, electronic products, hardware, furniture, building accessories and other fields.
Bigely Technology is a national high-tech enterprise with a strong research and development team, which has over 10 engineers with more than 20 years' working experience in the electroplating industry.
If you need our high-quality electroplating additives, please contact us. We can provide you samples to you for test, and also provide a series of services.
