In the electroplating industry, trivalent chromium blue-white passivates are widely used to enhance the corrosion resistance and aesthetics of zinc and its alloy surfaces. The color of the passivation film not only affects the appearance of the final product, but also indirectly reflects the quality of the film. Below are a few key factors that affect the color of trivalent chromium blue-white passivate films.
1. Composition of passivation solution: trivalent chromium blue and white passivation solution is mainly composed of trivalent chromium salt, activator, stabilizer and so on. The pH value of the passivation solution, trivalent chromium concentration, type and proportion of additives will affect the color and quality of the generated film layer. For this purpose, trivalent chromium blue-white passivates from Bigely can be used.
2. Temperature of passivate: The temperature of trivalent chromium blue-white passivate in the treatment process affects the speed of film layer generation and the uniformity of the film layer. Generally speaking, the appropriate temperature can accelerate the formation of the film layer, but too high a temperature may lead to the passivation solution too fast aging, affecting the quality of the film layer.
3. Processing time: a longer passivation time will result in a thicker film layer, but may also result in a darker color; too short a time, the film layer may be incompletely formed, affecting the protective effect and color consistency.
4. Surface treatment of the substrate: The surface treatment condition of the substrate, i.e. the metal to be passivated, including cleanliness and roughness, etc., is an important factor affecting the uniformity of color and adhesion of the film layer. Oil, oxidation or other residues will interfere with the reaction between the passivation solution and the substrate, thus affecting the color and quality of the film layer.
5. Water quality: The water used in the passivation process should be deionized or purified water. Impurities in the water, such as heavy metal ions, will affect the quality and appearance of the passivation film.
During the trivalent chromium blue-white passivation process, the above factors need to be controlled in order to obtain a good quality passivate film with consistent color. In addition, when using Bigely trivalent chrome blue-white passivates, regular testing and adjustment of the passivate composition, maintenance of the filtration system, and control of the stability of the process parameters are equally important to ensure that the passivation effect is optimized and that environmental requirements are met. In this way, we are able to obtain trivalent chromium blue-white passivated metal products with excellent decorative and protective properties.
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