Electrochemical characteristics of the dynamic progression of erosion-corrosion under different flow conditions and thei
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ORIGINAL PAPER
Electrochemical characteristics of the dynamic progression of erosion-corrosion under different flow conditions and their effects on corrosion rate calculation Yunze Xu 1,2
&
Liang Liu 1 & Chenbing Xu 1 & Xiaona Wang 3 & Mike Yongjun Tan 4 & Yi Huang 1
Received: 26 March 2020 / Revised: 12 July 2020 / Accepted: 1 August 2020 / Published online: 6 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract 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. Keywords Erosion-corrosion . Dynamic progression . Electrochemical parameters . Critical impact energy
Introduction Material degradation caused by the synergistic effect of erosion and corrosion is a highly challenging issue for steel pipelines transporting corrosive slurries [1–3]. Under such condition, the metal atoms are firstly oxidized into ions before they leave the metal substrate during an electrochemical corrosion process, whereas metal atoms are physically peeled from the
metal surface during an erosion process [1, 4]. The total metal loss induced by erosion-corrosion can be expressed as follows [1]: ˙ t¼W ˙ cþW ˙ e¼W ˙ 0þW ˙ eþW ˙ 0þW ˙ c W c c e e
ð1Þ
˙ t is the total metal loss rate, W ˙ c is the metal loss rate where W ˙ e is the metal loss rate induced by induced by corrosion, W 0 ˙ is the pure corrosion rate without the appearance erosion, W c
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10008-020-04795-9) contains supplementary material, which is available to authorized users. * Mike Yongjun Tan [email protected] * Yi Huang [email protected] 1
School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Linggong Road 2#, Ganjingzi District, Dalian 116024, Liaoning Province, China
2
School of Civil Engineering, Dalian University of Technology, Dalian 116024, China
3
School of Physic and Optoelectronic Engineering, Dalian University of Technology, Dalian 116024, China
4
School of Engineering, Deakin University, Geelong, VIC 3216, Australia
˙ 0 is the pure erosion rate without the appearance of erosion, W e ˙ e is the erosion enhanced corrosion rate and of corrosion, W c
˙ c is the summa˙
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