High temperature oxidation of laser surface treated Fe-Cr alloys in HCl-containing atmosphere

摘要

Laser surface treatment of Fe-1, 2, 5, 10, 14 and 19Cr alloys was accomplished by CO, gas laser. High temperature oxidation behavior of laser treated alloys was investigated in HCl-containing atmosphere by thermogravimetric technique. Mass change of Fe-Cr alloys in 1HCl-50O-2-N-2 atmosphere at the temperature range from 1073-1273 K was effectively reduced by laser treatment. The effectivity of this treatment was most significant in case of Fe-14Cr alloy. From analyses of the scales formed in the initial stage and in the later stage, the mechanism of improvement in oxidation resistance in 1HCl atmosphere was discussed. (C) 1998 Published by Elsevier Science S.A. All rights reserved. References: 4