An Attempt to Estimate the Atmospheric Corrosivity by Multi-Channel Quartz Crystal Microbalance Sensors

Abstract

The corrosion rates of multiple metals were simultaneously monitored with the multi-channel quartz crystal microbalance sensors, and the measurement-based inverse estimation method for the concentrations of corrosive gases was studied. It was found that the relationship between the corrosion rates and the environmental factors could be formulated by regarding the corrosion rates of Ag, Co, and Cu as the function of SO₂, NO₂, H₂S and relative humidity. The inverse estimation of the concentrations of corrosive gases can be made on the basis of these approximate equations. The dependence of corrosion rate for each metal on the environmental factors is possibly influenced by the kind and the abundance ratio of corrosion products.