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Zinc Phosphate Voted as Most Promising Anti-corrosive Pigment for Coating Protection

SpecialChem / Jan 2, 2013

Organic coatings provide a protective barrier film for metal substrates. However, organic coatings are not impervious to moisture and do not provide corrosion resistance. When moisture penetrates through the coating and comes in contact with the metallic surface, the metallic surface can undergo corrosion. One of the options to protect the metal surface from corroding is to incorporate anti-corrosive pigments into the coating. For example, zinc phosphate provides corrosion protection to steel substrates via the following mechanism: zinc phosphate (Zn3(PO4)2) hydrolyzes in water to produce zinc ions (Zn2+) and phosphate ions (PO43-). The phosphate ions act as anodic corrosion inhibitors by phosphating the steel and rendering it passive. The zinc ions act as cathodic corrosion inhibitors. Corrosion protection is also important to prevent loss of adhesion (blistering) between the paint and metal surface.

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