Effect of Ni additives on the microstructure of galvanizing coating

The problem of "corrosion" covers all fields of the national economy, ranging from daily life to transportation, machinery, chemical industry, metallurgy, from cutting-edge science and technology to national defense industry. Especially in the steel industry, corrosion is the most serious. We usually use hot galvanizing technology to prevent steel corrosion. Ni is used as an additive duringhot dip galvanizing. How does the use of Ni as an additive affect the coating tissue?

First: he effect of Ni content on plating thickness.

Through data analysis and comparison, it was found that the Ni content was different and the plating thickness was different. With the increase of the Ni content of additives, the plating thickness became thinner and thinner. At the same time, when the plating thickness decreased, the variation trend of the zinc content was relatively consistent. However, we should also pay attention to proper amount when adding Ni.

Second: the effect of Ni addition on the coating tissue.

Viewed from the outside of the plating layer, the plating time of pure zinc coating was similar to that of zn-ni alloy coating for a short time. However, as the plating time was prolonged, the appearance of pure zinc coating was obviously different, and the coating was dull. With the increase of Ni content, the leadtime of gray coating is slower and slower.

In industrial production, hot dip galvanizing with Ni added directly is easy to operate, and the loss of Ni is reduced. Moreover, no changes are needed to the traditional hot dip galvanizing process parameters. After adding Ni, the coating surface quality is good and the corrosion resistance of the plating parts is good.

In the whole process of hot dip galvanizing, adding alloy is a very important link.