What is Zinc Plating?
Zinc Plating refers to the surface treatment technology of plating a layer of zinc on the surface of metals, alloys or other materials to play the role of aesthetics and rust prevention. Galvanized is divided into hot Zinc Plating and cold Zinc Plating, the main method used is hot Zinc Plating.
Zinc Plating
Steel is easy to rust in air, water or soil, or even completely damaged. The annual steel loss caused by corrosion accounts for about 1/10 of the entire steel production, on the other hand, in order to make the surface of steel products and parts have a special function, while giving its surface decorative appearance, so it is generally treated by electroZinc Plating.
The process principle
Because zinc is not easy to change in dry air, and in humid air, the surface can generate a very dense basic zinc carbonate film, which can effectively protect the interior from corrosion. And when for some reason, the coating is destroyed and the steel base is not too large, the zinc and the steel base form a microbattery, so that the steel base becomes the cathode and is protected.
Performance characteristics
- Zinc coating is thick, fine crystallization, uniform and no porosity, good corrosion resistance;
- The zinc layer obtained by Zinc Plating is pure, corroded slowly in acid, alkali and other fog, and can effectively protect the steel matrix;
- Zinc coating after chromic acid passivation form white, color, military green, beautiful and generous, with a certain decorative;
- Because the zinc coating has good ductility, it can be cold stamping, rolling, bending and other forms without damaging the coating.
Process steps
- Pickling: The steel plate is soaked in acid to remove the oxide and rust on the surface.
- Electrolysis: the pickling steel plate is put into the plating tank as the cathode, the zinc plate as the anode, the current is formed in the electrolyte, and a zinc layer is formed on the surface of the steel plate.
- Washing and drying: the plated steel plate is processed into the final product through washing, water removal, drying and other processes.
Scope of application
The application of Zinc Plating has been throughout the various production and research departments of the national economy. For example, machine manufacturing, electronics, precision instruments, chemical industry, light industry, transportation, weapons, aerospace, atomic energy and so on.
Advantages of Zinc Plating
- Good corrosion resistance and durability: zinc has high chemical stability, which can prevent metal materials from being oxidized and corroded, and extend the service life of metal materials.
- Good plasticity: Zinc has good plasticity, even after bending, stretching and other processing can still maintain a good surface coating.
- Low cost: Because zinc is a bulk raw material, the cost of Electroplating is lower than that of other anti-corrosion materials (such as stainless steel).
