ELECTROCHEMICAL INVESTIGATION ON THE ANTI-CORROSION PROPERTIES OF ZINC-RICH COATING FILM AGAINST THE DEFECTS

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  • ジンクリッチ塗膜の傷部に対する防食特性に関する電気化学的検討

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<p> The zinc-rich coating film has been used as an anti-corrosion primer of the heavy-duty paint coating for the steel structures exposed to the atmospheric environment. However, there are many unclear points about the corrosion protection properties of zinc-containing paints on those regions in steel structure, where the rainwater accumulated, and wet-dry cycles repeated. Moreover, the electrochemical mechanism of steel substrates between coating defects has not been investigated with elucidating its anti-corrosion properties. The objective of this research is to electrochemically elucidate the anti-corrosion properties of the steel substrate exposed at the adjacent coating defects of the organic and inorganic zinc-rich paints, focusing on the stagnated water and repeated wet-dry cyclic condition. Therefore, the model specimens were fabricated to simulate coating defects, and the time-dependent macrocell currents and AC impedance were monitored. Their test results revealed that for the inorganic zinc paints with relatively small diameters of defects, the anti-corrosion acts effectively due to the sacrificial anodic effects of zinc powder and compounds shielding. Nevertheless, the anti-corrosion effect of the organic zinc-rich coating is difficult to generate against the steel substrate.</p>

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