The Role of Zinc-Nickel Alloy in Hot-Dip Galvanizing - Mitigating Issues of Excessive Coating Thickness and Poor Adhesion

During the hot-dip galvanizing process, especially when dealing with materials such as silicon-containing reactive steels, conventional galvanizing often results in issues such as excessive coating thickness and poor adhesion. The addition of zinc-nickel alloy can effectively mitigate these problems. Incorporating a small amount of nickel into the molten zinc can inhibit the rapid growth of the ζ-phase in the Fe-Zn alloy layer, resulting in a thinner alloy layer and thus improving the adhesion and appearance quality of the coating. For specific materials such as silicon-killed steels, the addition of zinc-nickel alloy can also eliminate the issue of excessive coating thickness caused by the Zindel effect.