The mechanoelectrochemical effect on the electrochemical corrosion of austenitic stainless steel

Abstract

In this paper, the mechanoelectrochemical effect on the electrochemical corrosion of 316 L austenitic stainless steel was investigated by theoretical, experimental and simulated methods. The modified piecewise formula φa,eq=φa,eq0−ΔPmVmzF−TRzFln(KN0εp+1) for calculating the strain on anode equilibrium potential of austenitic stainless steel was proposed. It is demonstrated that the corrosion current increases from 8.03×10−6A⋅cm−2 to 28.38×10−6A⋅cm−2 within 20% strain, especially within 10%, which is in better agreement with the experimental results. This modification not only made the physical meaning of parameters clearer, simplified the formula, but also made the calculation results more accurate. Moreover, the localized galvanic corrosion caused by non-uniform deformation had been verified by finite element model. The results revealed that the non-uniform strain at the initial stage of strain (εp<0.05) has a greater influence on the corrosion resistance.

Keywords

• Corrosion
• Austenitic stainless steel
• Mechanoelectrochemical effect
• Finite element model