Galvanizing is a commonly used metal anti-corrosion method that protects the base metal from corrosion by forming a zinc layer on the metal surface. In order to evaluate the corrosion resistance of the galvanized layer, a salt spray test is usually performed. So, what is the time standard for the galvanized salt spray test?
Author: Marisa
Galvanizing is a commonly used metal anti-corrosion method that protects the base metal from corrosion by forming a zinc layer on the metal surface. In order to evaluate the corrosion resistance of the galvanized layer, a salt spray test is usually performed. So, what is the time standard for the galvanized salt spray test?
1. Salt spray test time of electrogalvanizing
Electrogalvanizing is the process of depositing a zinc layer on a metal surface by electrochemical methods. Since its coating is relatively thin, the salt spray test time is relatively short. Generally speaking, an electrogalvanized layer without additional treatment can withstand a 24-36-hour salt spray test. However, if post-treatments such as blue-white passivation are performed after electrogalvanizing, the salt spray time can be increased to no less than 72 hours.
2. Salt spray test time of hot-dip galvanizing
Hot-dip galvanizing is the process of immersing metal parts in molten zinc to form a thicker zinc layer on its surface. Due to the thicker coating, hot-dip galvanizing usually performs better in salt spray tests than electrogalvanizing. Under standard salt spray test conditions, hot-dip galvanized layers can withstand hundreds to thousands of hours of salt spray tests. If additional anti-corrosion treatments such as passivation, sealing or coating are performed, this time may be longer.
3. Factors affecting the salt spray test time
In addition to the galvanizing process and post-treatment methods, the salt spray test time is also affected by other factors, such as the thickness of the coating, the quality of the galvanizing process, and the conditions of the salt spray test. These factors may lead to differences in the salt spray test time.
4. Methods to improve the salt spray resistance of the galvanized layer
In order to extend the salt spray resistance time of the galvanized layer, some measures can be taken to improve the quality of the galvanized layer. For example, optimize the galvanizing process parameters, strengthen post-plating treatment, and select high-quality galvanizing additives. These measures are helpful to improve the density and adhesion of the galvanized layer, thereby improving its corrosion resistance.
In short, the time standard of the galvanized salt spray test varies depending on the galvanizing process and post-treatment method. When choosing galvanized products and post-treatment methods, they should be comprehensively considered according to their final use environment and requirements.
Hebei Ruisite (RST) produces kinds of electroplating machines and electroless plating machines. They can be zinc(galvanizing) plating, nickel plating, chrome plating, copper plating, phosphating, gold plating, tin plating, cadium plating etc. Welcome to contact sales manager Ms.Marisa whatsapp 0086-18132654670 for details.