Influence of surface roughness on performance of zinc rich paint coatings
(1. Department of Chemistry, Zhejiang University, Hangzhou 310027, China;
2. State Key Laboratory for Corrosion and Protection of Metals,
Institute of Metal Research, The Chinese Academy of Sciences,
Shenyang 110016, China)
2. State Key Laboratory for Corrosion and Protection of Metals,
Institute of Metal Research, The Chinese Academy of Sciences,
Shenyang 110016, China)
Abstract: The influence of surface roughness on the performance of zinc-rich paint(ZRP) coatings was studied. Electrochemical impedance spectroscopy(EIS) measurements were used to assess the corrosion prevention performance of the ZRP coatings. Furthermore, the EIS data of the steel-ZRP-sea water system were interpreted according to equivalent circuit models and the corresponding parameters were derived to assess the coating deterioration with time. The results show that the rougher surface favors better protection effect of the ZRP coatings. The protection potential of ZRP coatings for the standards and codes of practice is -0.78V(vs SCE).
Key words: zinc-rich paints; surface roughness; electrochemical impedance spectroscopy; cathodic protection