含Ce2O3氧化物对改善双相不锈钢亚稳态点蚀的机理研究*

doi:10.11896/j.issn.1005-023X.2017.016.017

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Abstract By means of scanning electron microscope (SEM), atomic force microscopy (AFM), potentiostatic pulse technique (PPT), pitting initiation mechanism of 2205 stainless steel in neutral chloride ion environment caused by oxide was studied. It was found that contact potential difference (CPD) increased sharply at MgO segregation in the MgO-Al₂O₃ inclusions and CaO enrichment zone in the MgO-CaO-Al₂O₃ inclusions. The enrichment of CaO was easy to cause the appearance of micro cracks on the surface and the exposure of matrix, which leads to galvanic corrosion. After treated by Ce, the inclusions were transformed into complex inclusions containing Ce₂O₃·11Al₂O₃ or Ce₂O₃·Al₂O₃. CPD decreased and pitting initiation phenomenon did not emerge. Finally, the pitting initiation mechanism caused by oxides inclusions and mechanism of Ce reacted with inclusion were explained.

Key words： Ce₂O₃-contained oxide metastable pitting contact potential difference potentiostatic pulse test

Published: 07 May 2018

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TF764+.1

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	Articles by authors
	PANG Zongxu
	ZHU Rong
	TU Kailu
	TANG Tianping
	ZHANG Yibo

Cite this article:

PANG Zongxu,ZHU Rong,TU Kailu, et al. Study on Mechanism of Improving Metastable Pitting of Duplex Stainless Steel by Ce₂O₃-contained Oxide[J]. Materials Reports, 2017, 31(16): 81-88.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.016.017 OR http://www.mater-rep.com/EN/Y2017/V31/I16/81

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