The effect of Pigment volume concentration on corrosion protection of new sacrificial coating

摘要

AbstractA new type of sacrificial coating (named SA coating) was developed by adopting anodic pigment of aluminum based alloy powder to make the underlying metal more negative than its corrosion potential. The effects of the Pigment Volume Concentration (PVC) on corrosion protection for the substrate metal were studied by potential monitoring, AC impedance measurement, salt water immersion, and routine tests. Optimum pigment volume concentration range was determined to provide satisfactory corrosion protection and the protective mechanisms were proposed to explain the experimental results.