ANODIC STRESS CORROSION CRACKING SUSPECTIBILITY OF NICKEL AND NICKEL-CHROMIUM ALLOYS CONTAINING MOLYBDENUM AND IRON IN BICARBONATE PLUS CHLORIDE SOLUTIONS AT 90°C

NATALIA S. ZADOROZNE; MABEL C. GIORDANO; RAÚL B.REBAK; ALICIA E. ARES; RICARDO M. CARRANZA

CORROSION

NATL ASSOC CORROSION ENG

Lugar: Houston, TX 77084, USA; Año: 2015 p. 420 - 432

0010-9312

It is reported in the literature that alloy C-22 (N06022) wasfound to be susceptible to stress corrosion cracking (SCC) inpresence of bicarbonate ions, at temperatures higher than60°C and anodic applied potentials in the order of 400 mVSCE,(where SCE is the saturated calomel electrode) when usingslow strain rate tests (SSRTs). This potential range of crackingsusceptibility was associated with the instability of a film thatmay form on the surface. In order to elucidate the role of thealloying elements on the SCC susceptibility of nickel (Ni)-basedalloys, four alloys?C-22 (N06022), 600 (N06600), 800H(N08800) and Ni-201 (N02201)?were tested under the sameconditions. Results showed that even though C-22, 600, and800 may have similar electrochemical anodic behavior, onlyC-22 may present a clear case of SCC at anodic potentials.