1987 Volume 22 Issue 1 Pages 44-51
Specimens of carbon steel were exposed to the atmosphere and air pollutants weremeasured at 7 sites in Tokyo. The relationship between corrosion rate of the steel and air polltion data was studied from the comparison of those taken at the sites and those temporal trends. Corrosion ratewas extremely high in the early 1970, s andthereafter but it gradually decreased and showed about 70% decrease for subsequent 10 years period. It seemed most likely that the decrease was due to the decreaseof air polluants, especially SO2 concentration and the amount of fall dust.
The single correlation coefficient showed strong relationship between corrosion rate and air pollutants such as SO2, fall dust soluble, meteorological factors such as temperature and relative humidity. Multiple linear regression was used to analyse the relatinship between corrosion behavior of this steel and the collected environmental data. From this analysis and the R value of observed and predicted values showed good correlation and both SO2, humidity were especially significant to the rate of corrosion.
