Investigation of Limiting Potential of Protection of Stainless Steel in Electrochemical Protection (Part 2)

Comparison of Parameters Determining Limiting Potential of Protection and Possibility of Prediction of Rupturing Time

Abstract

To obtain an orientation for rapid and precise evaluation in a constant load method, a limiting potential of protection of two-phase stainless steel (SUS 329J4L) was investigated at a stress in plastic region. In the tests under this conditions, the limiting potential of protection (-0.85V vs. Ag/AgCl) could be rapidly and precisely determined by using parameters of relative elongation percentage (ε_r), decreasing percentage of area (A), tensile strength (S_T), yield stress (σ_y), rupturing stress (σ_r) and total length of cliff (L_c). In particular, parameters, A and σ_r, were effective in consideration of working efficiency. A rupturing time of steel was able to be determined by a measurement of steady strain rate (R_ss), which was an effective parameter in a prediction of rupturing time.