Estimation of Pollutant by X-ray Analysis of Rust Layers on Several Metals

Atmospheric Corrosion of Metals in Inland Industrial Districts (Gunma Pref.). (Part 2)

Abstract

In view of the accelerated atmospheric rusting in Shibukawa area, Gunma, presumably due to the presence of HCl released from chemical plants, a series of atmospheric exposure tests has been carried out for one year starting in Sept. 1972. Data were obtained with steel, zinc and silver specimens at polluted area, Osaki and Nakamura, the others at less polluted area, Toriba and Shinto. Corrosion products on the exposed specimens were analyzed by X-ray and the weight loss of specimens was measured. The result of X-ray analysis showed that amounts of Cl on all specimens and produced AgCl on silver are higher at Nakamura than other areas. Amounts of S on steel and zinc are similarly higher at Nakamura. On the basis of these data, it is estimated that corrosion at Nakamura is mainly due to HCl and Sulphur pollutants.