Application of Scratching Electrode Method for Corrosion Fatigue

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  • 引かき電極法の腐食疲労への応用
  • ヒッカキ デンキョクホウ ノ フショク ヒロウ エ ノ オウヨウ

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It has been demonstrated that anodic dissolution rate of the bare surface of steels, which is produced in the process of crack propagation, is much greater than that of the steady-state surface near corrosion potential in NaCl aqueous solutions. In order to understand the roll of anodic dissolution on corrosion fatigue crack growth rate, both the corrosion fatigue and the bare surface polarization behavior were investigated on SCM435 steel in 3% NaCl aqueous solution. Corrosion fatigue tests were carried out under various potentials (-900--600mV) and frequencies (0.03-3Hz). Bare surface polarization curves were measured by scratching electrode method with various pH and dissolved oxygen content (DO).<br>The results showed that the enhanecd acceleration of growth rate was observed when the potential was -600mV and the growth rate tended to increase as the frequency decreased. The theoretical curves calculated from anodic dissolution model predicted well the acceleration of the growth rate. It appaers to have a great possibility that the anodic dissolution is the rate-controlling factor in corrosion fatigue at low ΔK levels.

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