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| Electrochemical Noise Behavior of X70 Steel and Its Weld in Cl--containing High pH Solution |
LI Hongjin, WANG Qishan, LIAO Zihan, SUN Xiangrui, SUN Hui, ZHANG Xinyang, CHEN Xu( ) |
| College of Petroleum Engineering, Liaoning Petrochemical University, Fushun 113001, China |
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Abstract The electrochemical corrosion behavior of X70 steel and its weld in a Cl--containing Na2CO3+NaHCO3 solution by various applied potentials was studied by means of electrochemical noise (EN) technique. Statistical analysis was conducted on the EN data to obtain the specific spectrum to characterize the initiation and development of the pitting. The results showed that the EN technique could effectively monitor the pitting process of X70 steel, while the amplitude of current noise reflected the initiation and development process of localized corrosion. When X70 steel was anodic polarized, the energy density spectrum (EDP) of EN moved from low-order zone to high-order zone, correspondingly, the pitting developed from metastable state to steady state. When the applied potential was in the activation-passivation zone, the EDP located in the metastable pitting zone. When the applied potential rose to stable passivation zone, the EDP of the substrate corresponds a pitting initiation period and the pitting resistance of the substrate was better. While the EDP for the weld with higher energy indicated that a small amount of steady-state pitting has been formed. By the same applied potential, the fluctuation range of EN and energy density of the substrate was small in comparison with the weld, indicating that the passivation film of the weld had a poor re-healing ability and was prone to be attacked. Due to that the weld had higher energy density, therefore, on which pitting developed faster than on the substrate.
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Received: 09 December 2020
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| Fund: Key Project of the Education Department of Liaoning Province of China(L2017LZD004);and;Chunhui Plan Cooperative Scientific Research Project of Ministry of Education of China |
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Corresponding Authors:
CHEN Xu
E-mail: cx0402@sina.com
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About author: CHEN Xu, E-mail: cx0402@sina.com
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