Effect of Calcium on Atmospheric Corrosion Resistance of Bridge Steel

Authors

Dong-liang LI, School of Metallurgy, Northeastern University, Shenyang 110819, China;
Gui-qin FU, School of Metallurgy, Northeastern University, Shenyang 110819, China;
Miao-yong ZHU, School of Metallurgy, Northeastern University, Shenyang 110819, China;Follow

Corresponding Author

Miao-yong ZHU(myzhu@mail.neu.edu.cn)

Abstract

The corrosion behavior of bridge steel in simulated hot and humid industrial-marine atmosphere was investigated by mass loss analysis, XRD, SEM, electrochemical methods and a wet/dry alternate immersion corrosion test using 0.1 mol•L^-1 NaCl+0.01 mol•L^-1 NaHSO₃ solutions. The corrosion depth (W) of experimental steels before and after calcium treatment versus time (t) curves showed a good agreement with the power function of W=Atⁿ. The corrosion products were mainly composed of amorphous phase and a small amount of crystals including α-FeOOH, β-FeOOH, γ-FeOOH and Fe₃O₄. Trace calcium could promote the formation of ferrite and strengthen the protective film on steel surface to prevent the rapid corrosion of bare steel. It could also refine the grain of steel structure and inhibit the crystal transformation of corrosion products, accordingly, refine the particles of corrosion products and reduce the defects in rust layer, and finally, improve the density of rust layer.

Graphical Abstract

DOI Link

https://doi.org/10.13208/j.electrochem.161020

Publication Date

2017-12-28

Online Available Date

2016-12-01

Revised Date

2016-11-30

Received Date

2016-10-20

Recommended Citation

Dong-liang LI, Gui-qin FU, Miao-yong ZHU. Effect of Calcium on Atmospheric Corrosion Resistance of Bridge Steel[J]. Journal of Electrochemistry, 2017 , 23(6): 724-731.
DOI: 10.13208/j.electrochem.161020
Available at: https://jelectrochem.xmu.edu.cn/journal/vol23/iss6/11