Corrosion Behavior of T91 Steel by Salt Spray with 0.1%NaHSO3 Solution

doi:10.11902/1005.4537.2016.211

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (6): 583-589 DOI: 10.11902/1005.4537.2016.211

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Corrosion Behavior of T91 Steel by Salt Spray with 0.1%NaHSO₃ Solution

Chao FENG^1,², Bicao PENG^1,², Yi XIE^1,², Jun WANG^1,², Minghuan LI³, Tangqing WU³(

), Fucheng YIN³

1 State Grid Hunan Electric Power Corporation Research Institute, Changsha 410007, China
2 Hunan Xiangdian Boiler & Pressure Vessel Test Center Ltd., Changsha 410007, China;
3 School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China

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Abstract

Corrosion behavior of T91 steel by neutral salt spray with 0.1% (mass fraction) NaHSO₃ was studied by means of mass loss measurement, macro-appearances observation and characterization of corrosion products with scanning electron microscope/energy dispersive spectrometer (SEM/EDS). Results showed the corrosion product on the steel surface increases gradually throughout the salt spray testing, and its coverage ratio, integrity and compactness increase accordingly, and finally the corrosion product completely covers the steel surface. The corrosion product composed mainly of FeOOH, Fe₂O₃3H₂O and Cr₂O₃ containing a little sulfur. The corrosion process of T91 steel by salt spray test can be expressed as follows: during the salt spray with NaHSO₃ solution, localized corrosion sporadically generates on the steel surface at the initial stage, and then these localized corrosion develops into big corrosion spots, and finally those big corrosion spots spread and connected each other to generate corrosion on large area.

Key words: T91 steel salt spray test SEM localized corrosion

Received: 26 October 2016

ZTFLH:

TG172.4

Fund: Supported by National Natural Science Foundation of China (51601164) and China Postdoctoral Science Foundation (2017M622594)

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	Chao FENG
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	Jun WANG
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	Tangqing WU
	Fucheng YIN

Cite this article:

Chao FENG, Bicao PENG, Yi XIE, Jun WANG, Minghuan LI, Tangqing WU, Fucheng YIN. Corrosion Behavior of T91 Steel by Salt Spray with 0.1%NaHSO₃ Solution. Journal of Chinese Society for Corrosion and protection, 2017, 37(6): 583-589.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2016.211 OR https://www.jcscp.org/EN/Y2017/V37/I6/583

Fig.1 Mass loss curve of T91 steel under salt spray with 0.1%NaHSO₃ solution

Fig.2 Macro-appearances of the corrosion products of T91 steel after salt spray test in 0.1%NaHSO₃solution for 25 h (a), 50 h (b), 75 h (c) and 100 h (d)

Fig.3 Surface micro-appearance of the corrosion product film formed on T91 steel after salt spray test for 25 h (a) and the magnified image of the square area in Fig.3a (b)

Table 1 EDS results of the corrosion products formed on T91 steel after salt spray test in 0.1%NaHSO₃ solution for 25 h

Fig.4 Surface micro-appearance of the corrosion product film formed on T91 steel after salt spray test in 0.1%NaHSO₃ solution for 50 h (a) and the magnified image of the square area in Fig.4a (b)

Fig.5 Surface micro-appearance of the corrosion product film formed on T91 steel after salt spray test in 0.1%NaHSO₃solution for 75 h (a) and the magnified image of the square area in Fig.5a (b)

Fig.6 Surface micro-appearance of the corrosion product film formed on T91 steel after salt spray test in 0.1%NaHSO₃solution for 100 h (a) and the magnified image of the square area in Fig.6a (b)

Fig.7 XRD patterns of the corrosion products formed on T91 steel after salt spray test for different time

Fig.8 Corrosion morphologies of T91 steel after salt spray test for 25 h (a), 50 h (b), 75 h (c) and 100 h (d)

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