Passivation is a process commonly used to prevent corrosion on metal surfaces. It is aimed to obtain a passive surface resistant to oxidation.
In phosphate coating processes; after zinc, iron and manganese phosphating, ionic structures due to water impurity or hardness in rinsing processes can hold on the surface and salt formation may occur. Salt formation adversely affects the adhesion quality of the painted parts to the surface. As a result, the corrosion resistance of the treated parts is low. Passivation process eliminates such problems. It provides high corrosion resistance along with good adhesion capability for the painted parts.
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