EFFECTS OF TEMPERATURE ON LECTROCHEMICAL CORROSION OF DOMESTIC NUCLEAR-GRADE 316L STAINLESS STEEL IN Zn-INJECTED AQUEOUS ENVIRONMENT

doi:10.3724/SP.J.1037.2013.00416

Acta Metall Sin

2014, Vol. 50

Issue (1): 64-70 DOI: 10.3724/SP.J.1037.2013.00416

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EFFECTS OF TEMPERATURE ON LECTROCHEMICAL CORROSION OF DOMESTIC NUCLEAR-GRADE 316L STAINLESS STEEL IN Zn-INJECTED AQUEOUS ENVIRONMENT

LIU Xiahe, WU Xinqiang(

), HAN En-hou

Enviromental Corrosion center, Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Cite this article:

LIU Xiahe, WU Xinqiang, HAN En-hou. EFFECTS OF TEMPERATURE ON LECTROCHEMICAL CORROSION OF DOMESTIC NUCLEAR-GRADE 316L STAINLESS STEEL IN Zn-INJECTED AQUEOUS ENVIRONMENT. Acta Metall Sin, 2014, 50(1): 64-70.

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Abstract

The effects of temperature (T) on oxide films for 316L stainless steel (316L SS) in borated and lithiated water without and with Zn injection were investigated by in situ potentiodynamic polarization curves and electrochemical impedance spectra (EIS). The protective property of oxide films in the Zn-free/Zn-injected solution degraded with increasing temperature. With increasing temperature, the structure of the oxide film varied from a single layer to double layers, the Cr-rich oxide layer played a key role on retarding further oxidation. Compared to the Zn-free case, the corrosion rate decreased significantly in the Zn-injected solution due to the formation of compact Zn-bearing oxide films, but the instinct growth mechanism of the oxide films remained unchangeable. The solubilities and structure model of oxides were proposed to discuss the formation mechanism of oxide films on 316L SS in the hydrothermal solution.

Key words: 316L stainless steel Zn-injected water chemistry EIS potentiodynamic polarization curve oxide film

Received: 16 July 2013

ZTFLH:

TG172.9

Fund: Supported by National Natural Science Foundation of China (No.51371174), National Science and Technology Major Project (No.2011ZX06004-017) and National Basic Research Program of China (No.2011CB610505)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00416 OR https://www.ams.org.cn/EN/Y2014/V50/I1/64

Fig.1

316L SS在323.15~603.15 K区间, B+Li水环境中预氧化48 h后的极化曲线

Fig.2

316L SS在B+Li水环境中预氧化48 h后的i_p, E_corr与T的关系

Fig.3

无Zn和加Zn还原性水环境中已形成稳定氧化物表面的金属的Evans图解

Fig.4

316L SS在323.15~603.15 K区间, B+Li水环境中预氧化48 h后的Nyquist图

Fig.5

阻抗谱的等效电路

表1 316L SS在323.15~603.15 K, B+Li水环境中氧化膜EIS等效电路的拟合结果

表2 316L SS在323.15~603.15 K, B+Li加Zn水中氧化膜EIS等效电路的拟合结果

在298.15~603.15 K, 无Zn或加Zn水环境中316L SS表面可能形成的氧化物的溶解度

Fig.7

298.15~573.15 K水环境中316L SS表面氧化膜形成图解

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