Anodic characteristics and stress corrosion cracking behavior of nickel rich alloys in bicarbonate and buffer solutions

C. M. GIORDANO; R. B. REBAK; A. ARES; N. S. ZADOROZNE; R. M. CARRANZA

CORROSION SCIENCE

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2016 vol. 108 p. 1 - 10

0010-938X

tThe aim of this work is to investigate which alloying element in C-22 is responsible for the crackingsusceptibility of the alloy in bicarbonate and two buffer solutions (tungstate and borate). Six nickel basedalloys, with different amount of chromium (Cr) and molybdenum (Mo) were tested using electrochemicalmethods and slow strain rate tests (SSRT) at 90◦C. All Cr containing alloys had transgranular cracking athigh anodic potential; however, C-22 containing high Cr and high Mo was the most susceptible alloy tocracking. Bicarbonate was the most aggressive of three tested environments of similar pH.