Can the Prior Cathodic Polarisation Treatment Remove the Air-Formed Surface Film and Is It Necessary for the Potentiodynamic Polarisation Test?

doi:10.1007/s40195-020-01031-1

金属学报英文版 ›› 2020, Vol. 33 ›› Issue (6): 839-845.DOI: 10.1007/s40195-020-01031-1

收稿日期:2019-11-17 修回日期:2020-01-06 出版日期:2020-06-10 发布日期:2020-06-17

Can the Prior Cathodic Polarisation Treatment Remove the Air-Formed Surface Film and Is It Necessary for the Potentiodynamic Polarisation Test?

Zheng-Rong Ye¹, Zhi-Chao Qiu¹, Zheng-Bin Wang²(), Yu-Gui Zheng², Ran Yi¹, Xiang Zhou¹

¹Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, 100083, China
²CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

Received:2019-11-17 Revised:2020-01-06 Online:2020-06-10 Published:2020-06-17
Contact: Zheng-Bin Wang

摘要/Abstract

Abstract:

This paper clarifies two issues related to the prior cathodic polarisation treatment (PCPT) for the potentiodynamic polarisation test: whether PCPT can (1) remove the air-formed surface film and (2) affect the polarisation test results. X-ray photoelectron spectroscopy analyses of fluoride ion-labelled samples show that PCPT cannot remove the surface film completely due to the low reaction rate. Potentiodynamic polarisation tests demonstrate that PCPT with proper operating parameters, - 1.0 V_SCE for 5 min with subsequent open circuit potential (OCP) stabilisation in this study, is necessary because it can improve the test reproducibility without affecting the corrosion parameters by unifying the initial surface state. However, PCPT with lower potentials, longer time or no OCP stabilisation has significant effects on the electrochemical corrosion parameters due to the hydrogen absorption under the conditions of this study.

Key words: Stainless steel, Prior cathodic polarisation treatment, Surface film, Potentiodynamic polarisation

. [J]. 金属学报英文版, 2020, 33(6): 839-845.

Zheng-Rong Ye, Zhi-Chao Qiu, Zheng-Bin Wang, Yu-Gui Zheng, Ran Yi, Xiang Zhou. Can the Prior Cathodic Polarisation Treatment Remove the Air-Formed Surface Film and Is It Necessary for the Potentiodynamic Polarisation Test?[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(6): 839-845.

图/表 4

Fig.1 Current density-time curves of prior cathodic polarisation tests at - 1.0 VSCE, - 1.2 VSCE and - 1.4 VSCE for a 5 min, b 10 min, c 30 min

Fig.2 Detailed F 1 s XPS spectra of pre-formed film containing fluoride ion (F-) before and after PCPT

Fig.3 Potentiodynamic polarisation curves after PCPT at a, b - 1.0 VSCE, c, d - 1.2 VSCE and e, f - 1.4 VSCE with a, c, e and without b, d, f OCP stabilisation. The potential scanning rate is 1 mV/s

Fig.4 Ecorr, Icorr, Ipass and Epit values obtained from the potentiodynamic polarisation curves of Fig. 3. The control group is the case without PCPT. The potential scanning rate is 1 mV/s

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Can the Prior Cathodic Polarisation Treatment Remove the Air-Formed Surface Film and Is It Necessary for the Potentiodynamic Polarisation Test?

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