The erosion-corrosion performance of X65 carbon steel at different flow conditions was electrochemically studied. Results show that the anodic polarization branch would have a significant distortion in the flowing electrolytes, leading to an overestimation of the Stern-Geary coefficient using the traditional Tafel extrapolation. It is found that the critical impact energy for the initiation of erosion-corrosion is around 0.016 μJ. Surface morphology was obviously changed from “flow mark” appearance to continuous craters with the initiation of erosion-corrosion. The results indicate that the synergy of erosion and corrosion is the main factor contributing to the erosion-corrosion damage under active corrosion. The dynamic progression of erosion-corrosion is associated with the propagation of impingement pits at anodic sites and the wear of the corrosion product film at cathodic sites.

电化学研究了X65碳钢在不同流动条件下的腐蚀性能。结果表明，阳极极化分支在流动的电解质中将具有明显的畸变，从而导致使用传统的塔菲尔外推法过高估计了斯特恩-格里系数。已发现，引发腐蚀腐蚀的临界冲击能约为0.016μJ。随着腐蚀的开始，表面形态明显地从“流痕”外观变为连续的凹坑。结果表明，腐蚀与腐蚀的协同作用是造成主动腐蚀条件下腐蚀与腐蚀破坏的主要因素。