An investigation has been carried out to determine the corrosion protection that an inorganic sealing agent provides for micropores of spray coating films. The sealing agent used is composed of silicate compounds and easily penetrates the micropores of spray coating films. Generally speaking, its stability under ultraviolet light is much higher than any organic sealing agents available. In this study, the sealing capability of the inorganic agent was tested using several kinds of spray-coated specimens. In addition, observations were made about the anticorrosion characteristics of these sealed specimens. The samples used for this study were Zn/Al spray coated steel and pure aluminum spray coated steel. The inorganic silicate-sealing agent was applied to all of the specimens. However, some of them were ground until the sealing agent was completely removed from the surface of the specimens. For the latter case, the silicate-sealing agent remained only in the micropores of the spray-coated films. These specimens were observed by SEM-EDX to observe the sealing condition. Their corrosion characteristics were also observed by performing a CASS test. Using these results, we were able to evaluate the sealing agent’s protective capability for spray coatings.

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