Blue Zinc Knowledge Expansion
The difference between blue zinc-plated and blue white zinc-plated:
Appearance and colour: Blue zinc-plated is blue, blue white zinc-plated is silver.
Corrosion resistance: The corrosion resistance of blue zinc plated is greater than that of blue white zinc plated.
Blue white zinc plating is electric galvanizing, electric galvanizing was originally white, being blue after blue plating, which is called blue white zinc plating. Compared with other metals, it is a kind of relatively cheap and easy to plating metal, and it is a low value corrosion resistance electroplating, which is widely used to protect steel parts, especially to prevent atmospheric corrosion, and used for decoration.
Prevent iron from rusting, can be plated on the surface of the iron with a thin layer of zinc, according to the requirements can be blue and white zinc, can also be black zinc, color zinc, etc., this is based on the principle of electric conductor in the solution will absorb the atoms in the solution. Color galvanized passivation film is used for industrial parts, colorless galvanized passivation film is used in daily hardware, building hardware and other products requiring white even surface. The color depth of galvanized passivation film is also related to the thickness of the film layer. And the film thickness is related to the passivation time or the length of time in the air. In lowchrome and ultra low chromium passivation solution, passivation film is formed in solution, and if passivation time is long, the film is thick, and vice versa, if passivation time is short, the film is thin.
High quality passivation film should be complete with bright colours. The reddish-brown film layer is relatively loose, and the binding force with zinc layer is not good enough; Green passivation film may have a thin film layer, which may affect corrosion resistance. Therefore, we can judge the quality of passivated film from the appearance of passivated film, binding force with zinc layer, integrity of film, brightness and color of film layer.
Stainless Steel Eye bolts’ Application Scope
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