Metal release of Cr, Ni and Fe from stainless steel alloys and the pure metals.

摘要

The objective of this study has been to demonstrate differences in release rates of chromium, nickel and iron from stainless steel alloys (grade 304 and 316) and pure metals exposed under identical conditions. The results are based on laboratory investigations in a specially designed chamber which permits artificial rain to be introduced at a given rain composition and intensity. Metal release rates, and its kinetics as a function of rain duration and volume, were investigated during continuous eight-hour rain events of constant intensity (approx =4 mmhr~(-1)) and pH (4.3). In addition, changes in surface composition with time were monitored with XPS for the stainless steel alloys.