Evaluation of Initial Atmospheric Corrosion Resistance of Galvanized Steels by Surface pH Distribution Measurement
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概要
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Initial atmospheric corrosion resistance of galvanized steels has been evaluated by the corrosion test with thin water film and the surface pH distribution measurement. Scanning chemical microscope (SCHEM) was applied for the measurement of the surface pH distribution. Zn and Zn-55%Al coated steels, a part of which surfaces had been dissolved by an acidic solution, were used for the corrosion test and the pH measurement. As a result of the corrosion test, the dissolution of zinc was observed at the interface between the coating and the steel, and the white corrosion product was deposited on the steel. Though Zn-55%Al coated steel also showed almost the same corrosion behavior as Zn coated steel, the amount of the corrosion product was small. As a result of pH measurement, it was found that the coating of Zn coated steel tended to dissolve in comparison with Zn-55%Al coated steel. The surface pH distribution measurement using SCHEM is useful for the estimation of the initial corrosion performance of galvanized steels in an atmospheric environment.
- Japan Society of Colour Materialの論文