ELECTROCHEMICAL BEHAVIOR OF ANTI-CORROSIONCOATING WITH DIFFERENT PIGMENTS/FILLERSIN NaCl SOLUTION

摘要

In order to analyze the performance of different pigments/fillers, three anti-corrosionrncoatings are prepared with the same resin and different pigments/fillers that is respectively titaniumrndioxide, complex ferrotitanium powder, and quartz powder. The electrochemical corrosion behavior ofrnthese coatings in sodium chloride solution was studied by various electrochemical testing methods,rnwhich mainly include self-corrosion potential monitoring, polarization voltage test. This paper givesrnthe testing data of self-corrosion potential, polarization voltage of above five anti-corrosion coatings.rnBased on the obtained testing data and relevant graphs, the anti-corrosion performance andrnanti-penetration capacity of these anti-corrosion coatings are studied, and the performance sequence ofrnabove five coatings in anti-corrosion and anti-penetration capability is determined. By studying thernpigment/filler particles’ microscopic morphology and their distribution in coating layer, the reason thatrnthese coatings have different anti-penetration capacity and anti-corrosion capability is discussed, thernway how the chlorine ions penetrate into the coating layer is analyzed, and then the difference of thernanti-corrosion and anti-penetration capacity of above pigments/fillers is determined. Furthermore, thernstudy results in this paper will have guiding meaning in further pigment/filler selection for developmentrnof new anti-corrosion coatings.