Abstract
Pitting and crevice corrosion tests were conducted on Alloy 600 in both the sensitized and unsensitized conditions, using ferric and cupric chloride solutions at room temperature. This was a prelude to slow strain rate tests in these same solutions, as well as in liquid mercury and in the presence of hydrogen. The intentions were to seek connections between the different forms of a) localized corrosion and b) environmental assisted cracking. The corrosion tests demonstrated a propensity for crevice corrosion and for undercutting of pits under deposits. This suggested, based on previous work, that stress corrosion cracking would be minimal. Nevertheless, stress corrosion cracking was noted in sensitized alloys. In both heat treated states, Alloy 600 proved to be highly susceptible to both hydrogen and liquid metal embrittlement. In sensitized alloys, intergranular cracking was usual; both intergranular and transgranular cracking occurred in the solution treated state.
