A method of evaluation of the effectiveness of inhibitor protection of steels from stress-corrosion failure

Contribution of anodic dissolution and hydrogen embrittlement to corrosion-fatigue crack growth

“…This is one of important additional advantages of the application of the AEA-criterion. Since the increment of the CGR in the environment caused by HE is explained by the action of hydrogen formed at the crack tip as a result of the electrochemical reaction and diffusion into the zone of maximum tensile stresses, it can be determined by using the following formula [17]:…”

“…If we assume that the increment of the CFC growth rate in an environment is caused by LAD, then, in the first approximation, we arrive at the following expression based on the Faraday law [17,29]:…”

“…To determine the contributions of LAD and HE to the CGR in environments, we used the electrochemical parameters proposed for the evaluation of the efficiency of inhibitors [17][18][19][20]: AEA = Esc -Ere and AEH =E, -Etc. These parameters characterize the intensity of the mechanisms of LAD and HD, respectively.…”

“…The method is based on the use of electrochemical parameters characterizing the intensity of LAD and hydrogen depolarization (HD) at the tip of a corrosion fatigue crack (CFC). These criteria were previously used for the assessment of the efficiency of inhibitor protection [17][18][19][20]. The proposed method is also based on the use of the results of fatigue CGR (FCGR) tests of metals in air and corrosive media and takes into account the electrochemical conditions at the tip of the CFC (TCFC).…”