In modern industrial production, Hot Dipped Galvanized Coils have become an indispensable material in many fields due to their excellent corrosion resistance and processing performance. However, different application scenarios have different requirements for the surface treatment of Hot Dipped Galvanized Coils. This article will analyze the common surface treatment types and characteristics of Hot Dipped Galvanized Coils, providing a reference for selecting an appropriate surface treatment.
surface treatment types and characteristics of Hot Dipped Galvanized Coil
No treatment
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Oiling only
This surface treatment can reduce the generation of white rust on the surface of the product during transportation and storage. The anti-rust oil applied is generally not used as rolling oil and stamping lubricant for subsequent processing. Oiling is the most common basic surface treatment, with good versatility and strong adaptability, but its protective ability is obviously not as good as the subsequent film surface treatment.
Chromic acid passivation and chromium-free passivation (organic)
This surface treatment can reduce the white rust on the surface of the product during transportation and storage. In the case of chromium-free passivation, the hexavalent chromium substances in the passivation film that are harmful to human health are restricted. The passivation film can also reduce the friction between the material and the mold and has a certain lubrication ability, but the main purpose is still corrosion protection, and lubrication is only an incidental attribute.
Chromium-free fingerprint resistance
This surface treatment can reduce the white rust on the surface of the product during transportation and storage, and the fingerprint-resistant film can improve the sweat stain resistance of the surface of electronic or electrical products. Chromium-free anti-fingerprint film restricts hexavalent chromium substances that are harmful to human health (in compliance with the requirements of the RoHS directive). Anti-fingerprint coatings are often used in the manufacture of household appliances, which can effectively prevent the corrosion of parts by finger sweat during assembly and maintenance. Anti-fingerprint film also has a certain stamping lubrication effect.
Self-lubrication
This surface treatment can reduce the white rust on the surface of the product during transportation and storage, and the self-lubricating film can better improve the forming performance of the steel plate. It takes into account both rust prevention and lubrication and belongs to the film type product.
Inorganic solid lubrication
The solid lubricating film produced by this surface treatment can better improve the forming performance of the steel plate. This surface treatment has different definitions in different manufacturers. After consulting some information, it is found that the inorganic solid lubrication of some manufacturers is essentially a pre-phosphating surface treatment. This process has good surface hardness and excellent stamping lubrication effect, but the anti-rust ability is slightly poor.
