高温高湿度大気中におけるニッケルの腐食挙動と腐食生成物上での水蒸気の吸着挙動

抄録

Humid-environment corrosion of nickel and water vapor adsorption on its corrosion products were investigated at temperatures from 40° to 80°C, relative humilities from 50 to 95% and SO₂ concentrations from 0 to 20ppm. Quartz crystal microbalance (QCM) was used to determine the corrosion rate, and X-ray photoelectron spectroscopy (XPS) was used to determine the composition of corrosion products. Corrosion kinetics for nickel without SO₂ pollutant was described by cubic rate law. On the other hand, corrosion kinetics containing SO₂ more than 1ppm was linear. Dependence on relative humidity of corrosion rate was same as adsorption isotherm by Frenkel-Halsay-Hill theory on its corrosion product. Dependence on ralative humidity of corrosion rate was discussed in connection with adsorption behavior of water.