Untersuchungen zur H-induzierten Rißkorrosion – Teil 2: Vergleichende Untersuchungen zur Wasserstoffpermeation und Spannungsrißkorrosion

Investigation into the hydrogen induced cracking corrosion – Part 2: Comparative investigations into hydrogen permeation Creep specimens of cold rolled pure iron with different strengths have been stressed in H₂SO₄ + As₂O₃ undercathodic polarisation. The critical stress level for stress corrosion cracking is proportional to the yield strength ranging about 60% ys. At higher stresses the life times decrease with increasing strengths. No correlation exists with permeation rate and hydrogen content, but with time lag. Low alloy steel types show similar relationships in the same and in H₂S containing environments. Metallographic examinations show no relation between stress corrosion cracks and surface or inside blisters. SEM examinations show manyfold types of fracture surfaces without systematics.