Construction Project Quality and Safety Supervision Station

Qingzhou, China

Construction Project Quality and Safety Supervision Station

Qingzhou, China
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Tan H.L.,University of Science and Technology Beijing | Zhou C.,University of Science and Technology Beijing | Liu X.H.,Construction Project Quality and Safety Supervision Station | Cao G.M.,University of Science and Technology Beijing | Zhang J.,University of Science and Technology Beijing
Journal of the Chinese Society of Corrosion and Protection | Year: 2017

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. © 2017, Chinese Society of Corrosion and Protection. All rights reserved.

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