How to distinguish between cold and hot galvanizing

As an important accessory used in waterway pipelines, the corrosion resistance of malleable iron pipe fittings is of great significance due to their frequent contact with water and air. Malleable iron pipe fittings are generally treated for rust prevention by galvanizing the surface of the product.

As an important accessory used in waterway pipelines, the corrosion resistance of malleable iron pipe fittings is of great significance due to their frequent contact with water and air. Malleable iron pipe fittings are generally treated for rust prevention by galvanizing the surface of the product. Among them, galvanizing is further divided into two types: hot-dip galvanizing and cold galvanizing. So, how can we distinguish between cold and hot galvanized ductile iron pipe fittings? Tangshan Xinye Technology Casting introduces to you:

In terms of appearance, due to the uniform cold galvanized coating, its surface is close to the rough part, having the unique surface concavity and convexity of the rough product, looking smooth and bright. Due to the electrical shielding phenomenon, cold-galvanized parts generally have no galvanized layer inside (except for special galvanizing techniques). Hot-dip galvanized pipe fittings have a relatively thick zinc coating on their surface due to the late hot-dip galvanized layer and the poor fluidity of the zinc liquid. Moreover, as the surface of the hot-dip galvanized layer oxidizes to form a white protective layer, the color is generally rather dull, and the surface smoothness is far inferior to that of cold-dip galvanized products.