Zinc Plating

Zinc plating, also known as cold galvanizing in the industry, which is the process of using electrolysis to form a uniform, dense, and well-bonded metal or alloy deposition layer on the surface of the part.

Compared with other metals, zinc is a relatively cheap and easily plated metal. It is a low-value anti-corrosion electroplating layer and is widely used to protect steel parts, especially to prevent atmospheric corrosion. It's also wildly used in decoration.

Clear Zinc Plating

1. Principle

Because zinc is not easy to be changed in dry air, and when it comes to humid air, the surface zinc will form a very dense zinc carbonate film, which can effectively protect the interior from corrosion. And when the plating layer is damaged for some reason and exposed a modest substrate, the zinc and steel substrate would form a micro-battery, and the fastener substrate would become the cathode and get protected.

 Zinc Plated Fasteners

2. Performance characteristics

The zinc coating has many good characteristics. Such as thick, fine crystals, uniformity and no porosity, and good corrosion resistance. The zinc coating is relatively pure after galvanized, and the corrosion of the zinc coating is slow in the mist of acid and alkali, which can protect the fastener matrix effectively. The zinc coating will form many colors after chromic acid passivation, which is beautiful and decorative. Such as white, colorful, military green, etc. Due to the galvanized layer has good ductility, it can be cold punched, rolled, bent and without damaging the coating.

3. Scope of application

The zinc plating field is becoming more and more extensive. The application of fastener products has spread to machinery, galvanized chain link fence, electronics, precision instruments, chemicals, transportation, aerospace, etc.

Rainbow Zinc Plating

The rainbow zinc plating is a rainbow-colored passivation film which is obtained by do one-time treatment to the galvanized layer in a chromate solution. And the dominant color is Yellow.

Parts with Rainbow Zinc Plating

Generally, the structure of the film is the complex mixture which composed of basic chromium chromate and basic zinc chromate, chromium chromate, zinc chromate,  zinc and chromium oxides. The galvanized layer can greatly improve its corrosion resistance when it passed the passivation treatment and became iridescent color. The colorful zinc plating is mainly used for the protection of steel parts.