Surface of the slow extension rate test specimen failed in H₂S-saturated NACE TM-0177 solution (0.5% acetic acid and 5% NaCl) as a function of applied potential: (a) cathodically polarized N5 (5% Ni) at 1.5 mA.cm², (b) naturally corroding N0 (0% Ni), and (c) anodically polarized N5 (5% Ni) at 1.8 mA.cm². Adapted with permition from Yoshino, Y. & Minozaki, Y. “Sulfide stress cracking resistance of low-alloy nickel steels.” Corrosion 42, 222-233, doi: 10.5006/1.3586000 (1986).