Environment friendly chromate-free passivation solution based on silicate, and passivation technology thereof

Abstract

The invention belongs to the technical field of electroplating processing, and particularly relates to an environment friendly chromate-free passivation solution based on silicate, and a passivation technology thereof. The environment friendly chromate-free passivation solution based on the silicate provided by the invention comprises water, low mass molecule alcohol, sodium silicate, potassium silicate, sodium metasilicate, silane hydrolysate, diphenol propane, diethylene glycol monobutyl ether, sorbitol, phytic acid, glacial acetic acid, tannin, boric acid, sodium metasulfite, sodium nitrate, sodium hydrogen sulfite and other components, has excellent stability and can be stably stored for more than three months; and in the aspect of a passivation performance, a passivated coating has excellent corrosion resistance, blackening resistance and high temperature baking resistance. A passivation technology of the environment friendly chromate-free passivation solution based on the silicate provided by the invention comprises the steps of steeping, airing, ageing and the like. The environment friendly chromate-free passivation solution based on the silicate and the passivation technology thereof are simple and convenient to operate, economical in cost and stable and reliable in quality, and have higher popularization and application values.

Description

technical field [0001] The invention belongs to the technical field of electroplating processing, and in particular relates to a silicate-based environment-friendly chromium-free passivation solution and a passivation process thereof. Background technique [0002] Compared with metal parts, plastic electroplating products can not only achieve a good metal texture, but also reduce the weight of the product. While effectively improving the appearance and decoration of the plastic, it also improves its electrical, thermal and corrosion resistance. Performance; In addition, plastic parts have excellent comprehensive properties, are easy to process and shape, and the surface of the material is easy to erode to obtain high coating adhesion. Therefore, plastic electroplating has been widely used. However, the traditional plastic electroplating process is not only costly, but also inevitably causes certain environmental pollution. For example, the precious metal palladium is used in...

AI Technical Summary

Problems solved by technology

However, the traditional plastic electroplating process is not only costly, but also inevitably causes certain environmental pollution, such as the use of precious metal palladium in the activation process, and the use of highly polluted chromium in the passivation process.

In response to many defects, people have further developed palladium-free activation processes and chromium-free passivation processes. However, these processes still face many challenges in the process of replacing traditional processes.

Taking the chromium-free passivation process as an example, the existing chromium-free passivation process has problems such as unstable passivation solution, difficult long-term storage, and insufficient passivation effect.