外加拉应力对X80管线钢点蚀电化学行为的影响

运用电化学噪声测试技术，结合动电位极化方法研究了外加拉应力对X80管线钢在NaHCO₃ + NaCl体系中点蚀电化学行为的影响。结果表明，较小的外加拉应力（σ ≤100 MPa）对X80管线钢点蚀的发生有抑制作用，且抑制作用随应力的增大而增大；较大的外加拉应力（σ ≥200 MPa）对X80管线钢点蚀的发生有促进作用，且促进作用随应力的增大而增大。

Influences of Applied Tensile Stress on the Pitting Electrochemical Behavior of X80 Pipeline Steel

Abstract：The influence of applied tensile stress on the pitting electrochemical behavior of X80 pipeline steel in NaHCO₃ + NaCl solution was investigated by using electrochemical noise measurement combining with potentiodynamic polarization measurement. The results showed that the pitting of X80 pipeline steel was inhibited when the applied tensile stress lower than 100 MPa, and the lower the stress was, the weaker the inhibition was. The pitting of X80 pipeline steel was promoted when applied tensile stress higher than 200 MPa, and the higher the stress was, the stronger the promotion role was.