Comparative study on the stress corrosion cracking of {X70} pipeline steel in simulated shallow and deep sea environments
By Sun, Feilong; Ren, Shuai; Li, Zhong; Liu, Zhiyong; Li, Xiaogang; Du, Cuiwei
Published in Materials Science and Engineering: A
NULL
2017
Abstract
Abstract The stress corrosion cracking (SCC) behavior of {X70} steel in simulated shallow and deep sea environments was studied using potentiodynamic polarization measurement, a slow strain rate tensile (SSRT) test and scanning electron microscopy (SEM). The results indicate that the predominant cathodic reaction changes from an oxygen reduction reaction to the hydrogen evolution reaction as the dissolved oxygen (DO) content decreases. In the simulated deep sea environment, the {SCC} susceptibility of {X70} steel decreased first, reached its lowest point at 15 {MPa} and then increased as the simulated sea hydrostatic pressure (HP) further increased. This is consistent with the regularity for the change of the cathodic hydrogen evolution reaction current density iH at Ecorr, which indicates that the {HP} may influence the {SCC} susceptibility of {X70} steel by changing the permeated hydrogen concentration.
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