Hydrogen in chromium : influence on corrosion potential and anodic dissolution in neutral NaCl solution

• The influence of hydrogen charging, outgassing, pickling and passivation of mechanically polished chromium was investigated with respect to corrosion potential and anodic dissolution in 0.3 M NaCl solution. Secondary ion mass spectroscopy measurements were used to detect hydrogen after hydrogen charging by means of cathodic polarization. The results show that hydrogen in chromium decreases the corrosion potential and increases the anodic dissolution rate. Passivation in HNO3 and pickling in HNO3 + HF increases the corrosion potential, whereas no significant effect on the anodic dissolution could be observed, probably due to a hydrogen uptake in these surface treatments.

Nyckelord

chromium

polarization

SIMS

hydrogen adsorption

passivity

temperature oxidation-kinetics

oxide-growth mechanisms

stainless-steel

scale adherence

film

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