The Galvanic Corrosion Behaviors of 13Cr-N80 Steel Couples in NaCl Solution at Different Temperature

Abstract

Electrochemical method was employed to investigate galvanic corrosion behaviors of super13Cr and N80 couples in 5% NaCl solution at different temperature. Corrosion morphologies and products of the couples were analyzed by SEM, EDS and XRD. The results show that there existed distinct potential difference between super13Cr and N80 with different degree of corrosion in 5% NaCl solution at different temperature. N80 was accelerated to corrode as anode, however, super 13Cr was protected as cathode when their coupling. In order to avoid galvanic corrosion, the super 13Cr-N80 couples could not be used without any protection of N80 from 25°C to 80°C. Corrosion current density of the super13Cr-N80 couples increased with increasing temperature in 5% NaCl solution, as well as the more serious corrosion of N80, of which corrosion products are Fe3O4.