What coating is used on Galvanized plate products?
Passivation treatment after hot-dip galvanizing is the core of basic protection. About 76% of industrial products adopt trivalent chromium passivation (Cr-III), forming a 0.2-0.5μm thick conversion film on the zinc layer surface. In the salt spray test (ISO 9227), the appearance time of red rust is delayed to 2.3 times that of conventional galvanized sheets. …
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