Effect of Cr on Corrosion Resistance of Q420 Steel in Atmosphere with High Salinity

doi:10.11902/1005.4537.2016.041

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (3): 267-372 DOI: 10.11902/1005.4537.2016.041

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Effect of Cr on Corrosion Resistance of Q420 Steel in Atmosphere with High Salinity

Heling TAN¹,Cheng ZHOU¹(

),Xihui LIU²,Guoming CAO¹,Jing ZHANG¹

1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 Construction Project Quality and Safety Supervision Station, Qingzhou 262500, China

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Abstract

Effect of Cr on the corrosion resistance of Q420 steels with different Cr content (2%, 5% and 9% mass fraction) in atmosphere with high salinity was investigated by means of weight loss test, XRD and SEM. The results show that corrosion resistance of Cr modified Q420 steels is higher than that of simple Q420 steel. Among others the Q420 steel with 9%Cr shows the lowest corrosion rate and the highest corrosion resistance. The curve of corrosion rate versus time of the simple Q420 steel kept stable within a high level. While the corrosion rate of Cr modified steels increases in the initial stage and then increases, which indicates that the rust scale became compact and stable in the later stage. It was revealed that Cr can promote the formation of α-FeOOH, which is a stable phase and makes the rust scale much compact and stable so that to act as an effective barrier for the transfer process of the corrosive species.

Key words: Q420 Cr alloyed steel high salinity atmospheric environment corrosion resistance α-FeOOH

Received: 25 March 2016

Fund: Supported by National Natural Science Foundation of China (51271023)

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Cite this article:

Heling TAN,Cheng ZHOU,Xihui LIU,Guoming CAO,Jing ZHANG. Effect of Cr on Corrosion Resistance of Q420 Steel in Atmosphere with High Salinity. Journal of Chinese Society for Corrosion and protection, 2017, 37(3): 267-372.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.041 OR https://www.jcscp.org/EN/Y2017/V37/I3/267

Fig.1 Corrosion rate (a) and corrosion thinning (b) of four steels during cyclic immersion test

Fig.2 SEM images of Q420 (a, e), 2Cr (b, f), 5Cr (c, g) and 9Cr (d, h) steels after corrosion for 72 h (a~d) and 360 h (e~h)

Fig.3 Cross sections of rust layers formed on Q420 (a, b), 2Cr (c, d), 5Cr (e, f) and 9Cr (g, h) steels after corrosion for 72 h (a, c, e, g) and 360 h (b, d, f, h)

Fig.4 XRD patterns of Q420 (a), 2Cr (b), 5Cr (c) and 9Cr (d) steels after corrosion for 360 h and removing of the outer rust layer

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