EFFECT OF POTENTIAL PERTURBATION POLARIZATION ON THE STRESS CORROSION CRACKING OF 1Cr18Ni9Ti STAINLESS STEEL
1Cr18Ni9Ti不锈钢应力腐蚀开裂的电位扰动极化效应

The SCC susceptibility of 1Cr18Ni9Ti austenitic stainless steel in 0.75mol·L-1HCl +0.25mol·L-1NaCl solution has been studied by slow strain rate tests(SSRT) and SEM. During the slow rate tensile process, the specimen was polarized with different potential perturbation modes such as potentiostatic, cyclic potential scan and cyclic potential step methods. The results indicated that potential scan rate and step frequency played an essential role in the initiation and propagation of crack. Potential step at high frequency led to much higher cracking susceptibility than potential scan within the same potential ranges.