Effect of Crystallographic Orientation on Dissolution Behavior of Stainless Steels Single Crystal

The effects of surface orientation on dissolution rate of type 310S and Alloy 600 single crystals were investigated by potentiostatic etching in the active region in H2SO4–NaCl solution. (100) and (111) planes were prepared by cutting at the given angles of single crystals. The dissolution rate changed with etching potential and surface orientation. Residual plans were determined from these dissolution rate ratios. Residual planes changed in the sequence of {100}→{100}+{111}→{111} as the potential increases from the corrosion potential. These resuls imply an important relationship between fracture surface in stress corrosion cracking and faceting dissolution.