Erosion-corrosion behavior of SAF3207 hyper-duplex stainless steel

Hong-liang Xiang; Yu-rui Hu; Hua-tang Cao; Dong Liu; Xuan-pu Dong

doi:10.1007/s12613-019-1825-6

Volume 26 Issue 11

Nov. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(11): 1415-1426

Hong-liang Xiang, Yu-rui Hu, Hua-tang Cao, Dong Liu, and Xuan-pu Dong, Erosion-corrosion behavior of SAF3207 hyper-duplex stainless steel, Int. J. Miner. Metall. Mater., 26(2019), No. 11, pp. 1415-1426. https://doi.org/10.1007/s12613-019-1825-6

Cite this article as:

Hong-liang Xiang, Yu-rui Hu, Hua-tang Cao, Dong Liu, and Xuan-pu Dong, Erosion-corrosion behavior of SAF3207 hyper-duplex stainless steel, Int. J. Miner. Metall. Mater., 26(2019), No. 11, pp. 1415-1426. https://doi.org/10.1007/s12613-019-1825-6

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Research Article

Erosion-corrosion behavior of SAF3207 hyper-duplex stainless steel

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Corresponding authors:
Hong-liang Xiang E-mail: hlxiang@fzu.edu.cn

Hua-tang Cao E-mail: chtpmd@163.com
Received: 16 May 2019; Revised: 28 July 2019; Accepted: 31 July 2019

Abstract

Abstract

Polarization curves and mass losses of SAF3207 hyper-duplex stainless steel under various conditions were measured. The damaged surfaces after erosion-corrosion tests were characterized by scanning electron microscopy. The results showed that an increase in flow velocity could enhance the electrochemical corrosion and consequently decrease the passivation properties of the steel. The erosion-corrosion damage of the samples increased substantially when the flow velocity exceeded the critical value of 4 m·s^-1. The mass loss rate increased as the sand content increased, reaching a maximum at 7wt% sand content, corresponding to the most severe electrochemical corrosion damage. When the sand content was increased further, however, the mass loss rate decreased and then tended stable. The mass loss was divided into incubation, sustained, and stationary periods, with a maximum mass loss rate of 12.97 g·h^-1·m^-2 after an erosion period of 2.5 h. The erosion-corrosion mechanism was investigated in detail.
- hyper duplex stainless steel;
- erosion corrosion;
- flow velocity;
- electrochemical corrosion;
- microstructure morphology

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