Alkaline zinc plating is a widely used metal surface anti-corrosion technology, which can effectively prevent metal corrosion and improve the dimensional stability and surface quality of metals. However, under some special conditions, such as salt spray environment, the anti-corrosion ability of alkaline zinc plating will be affected to a certain extent.
Author: Marisa
A. Mechanism of alkaline zinc plating's effect on salt spray
Alkaline zinc plating is a widely used metal surface anti-corrosion technology, which can effectively prevent metal corrosion and improve the dimensional stability and surface quality of metal. However, under some special conditions, such as salt spray environment, the anti-corrosion ability of alkaline zinc plating will be affected to a certain extent.
The main reasons are as follows:
1. The raw materials and components of alkaline zinc plating coatings are different, and the anti-corrosion ability is also different. Some coatings with more defects are prone to corrosion in salt spray environment.
2. Salt spray will damage the protective oxide film formed on the metal surface, and some alkaline zinc plating coatings have poor resistance to such damage, resulting in increased corrosion.
3. Under high temperature and high humidity, alkaline zinc plating coatings will deteriorate, crack, etc., which will also increase the degree of its influence by salt spray.
B. How to reduce the impact of alkaline zinc plating on salt spray
In order to reduce the corrosion of alkaline zinc plating coating in salt spray environment, we can take the following measures:
1. Select high-quality alkaline zinc plating coating and strictly control the composition and surface defects of the coating during the production process.
2. Apply a layer of appropriate protective coating on the coating, such as baking varnish, organic coating, etc., to increase the coating's resistance to salt spray as much as possible.
3. In a high temperature and high humidity environment, timely maintain and repair the alkaline galvanized coating to prevent the paint film from cracking or deteriorating.