Research Progress of plastic Electroplating-substitute Chromium coating.
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Substitute chromium coating refers to the coating whose appearance, hardness, wear resistance and corrosion resistance are similar to those of hexavalent chromium coating [2]. There are mainly decorative chromium coating and hard chromium coating [3]. Chromium plating can fundamentally avoid the production of waste water containing chromium (VI). At present, the main decorative chromium coatings are Sn-Co, Co-W and Ni-W alloy coatings, and according to the deposition characteristics of hard chromium coatings, there are mainly electroplating Ni-Co, Ni-W, Ni-B and their ternary alloy coatings, electroless plating Ni-P, Ni-B and their ternary alloy coatings, composite plating Ni-P, Ni-B, Ni-W-based composite coatings and so on.
Characteristics and Application of Chromium plating.
The electroplated chromium coating has a beautiful color, which is light blue and silvery white, and the electrode potential of chromium is very negative (the standard electrode potential is-0. However, due to the strong passivation ability of metal chromium, it is easy to form a very thin oxide film on the surface of chromium coating in air, which makes the chromium coating have better corrosion resistance. For iron and steel substrate, chromium plating layer belongs to negative polarity coating.
According to the purpose, electroplated chromium coating can be divided into two categories: protective-decorative chromium coating and functional chromium coating, as well as black chromium coating and loose hole chromium coating. Protective-decorative chromium coating mainly has non-crack chromium coating, micro-crack chromium coating and microporous chromium coating, which can be used on some bright accessories; functional chromium coating mainly refers to hard chromium coating, which is mainly used for parts with high wear resistance and hardness; black chromium plating layer can prevent reflection; a large number of microholes on the surface of loose hole chromium plating layer can absorb lubricating oil to reduce wear and friction, and can be used as antifriction coating.
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