What are the surface treatment methods for metal steel grating?

Introduction to Hot-Dip Galvanizing for Steel Grating

Hot-dip galvanizing is a commonly used treatment method and is very economical and practical. After hot-dip galvanizing, steel grating forms a thick zinc alloy layer, up to 80 microns thick, which adheres tightly to the original steel. Without damaging the galvanized surface, hot-dip galvanized steel grating can have a static service life of over 30 years. Hot-dip galvanized steel grating has a bright silver surface after manufacture, which turns dark gray after oxidation. Unless subjected to physical damage, the zinc coating will not be damaged, making it a simple way to distinguish hot-dip galvanized steel grating. Introduction to Cold-Dip Galvanizing (Electroplating) for Steel Grating

Cold-dip galvanized steel grating is made by electrolyzing the steel grating after rust removal and polishing, then placing it in a zinc bath containing zinc salts. This process allows the zinc to adhere to the surface. Because the galvanizing process does not require heating, it is called cold-dip galvanizing. Electro-galvanized steel grating typically contains very little zinc on its surface, and scraping it will cause the zinc layer to fall off. It is also prone to rust in dark, damp areas. While cold-dip galvanized steel grating is slightly cheaper than hot-dip galvanized steel grating, its price-performance ratio is not as high as that of hot-dip galvanized steel grating. The surface of cold-dip galvanized steel grating has a pale yellowish appearance, and scraping it will cause the zinc layer to fall off.

Introduction to Spray Painting for Steel Grating

Spray-painted steel grating is generally suitable for decorative applications. The color can be freely adjusted, and it is the most affordable of the three surface treatments. Spray-painted steel grating typically uses metallic paint, which provides sun protection and long service life. The production process is as follows: rust removal, a coat of anti-rust primer, and then a coat of colored metallic paint. Due to the special properties of the paint, it is also very good to use it in some dry places.