Effect of Calcium on Atmospheric Corrosion Resistance of Bridge Steel

doi:10.13208/j.electrochem.161020

Abstract

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.

CLC Number:

TG174.2

LI Dong-liang, FU Gui-qin, ZHU Miao-yong. Effect of Calcium on Atmospheric Corrosion Resistance of Bridge Steel[J]. Journal of Electrochemistry, 2017, 23(6): 724-731.

References

[1] Xu Z B (许中波). Influence of inclusion content and morphology on mechanical properties of steel [J]. Journal of Iron and Steel Research (钢铁研究学报), 1994(04): 18-23.

[2] Wu Y Q (吴亦泉), Yang J (杨健), Zhu K (祝凯), et al. Effect of Ca content on inclusion evolution in shipbuilding structure steel [J]. Bao-Steel Technology (宝钢技术), 2014(04): 1-5.

[3] Lu F (陆丰), Cao F Y (曹凤豫), Li C J (李承基), et al. Alloying behavior of Ca in 58CrV steel [J]. Acta Metallurgica Sinica (金属学报), 1992,28(06): 7-12.

[4] Gao D C (高德春), Li C J (李承基), Cao F Y (曹凤豫). Effect of Ca on microstructures and impact toughness of 42MnCr steel [J]. Transactions of Metal Heat Treatment (金属热处理学报), 1993, 14(03): 9-14.

[5] Li D J (李大经), Pan J W (潘健武). Ca-treatment of seawater-resistant low alloy steels and its effects on properties of steels [J]. Journal of Anhui University of Technology (马鞍山钢铁学院学报), 1984(2): 24-33.

[6] Hu Y L (胡裕龙), Sun W (孙巍), Kong X D (孔小东), et al. Effect of calcium-treatment on resistance against pitting corrosion of AH36 hull structural steel [J]. Materials Science & Technology (材料科学与工艺), 2015, 23(04): 121-128.

[7] Kim K Y, Chung Y H, Hwang Y H, et al. Effects of calcium modification on the electrochemical and corrosion properties of weathering steel [J]. Corrosion, 2002, 58(6): 479-489.

[8] Luo X B (罗小兵), Chai F (柴锋), Su H (苏航), et al. Corrosion resistant ship hull in wet-dry environments contained H₂S [J]. Journal of Iron and Steel Research (钢铁研究学报), 2013, 25(08): 51-57.

[9] Liang C F (梁彩凤), Hou W T (侯文泰). Atmospheric corrosivity for steels [J]. Journal of Chinese Society for Corrosion and Protection (中国腐蚀与防护学报), 1998, 18(1): 1-6.

[10] Cui L (崔雷), Yang S W (杨善武), Wang S T (王树涛), et al. Corrosion behavior and corrosion products of a low carbon bainite steel in three kinds of typical environments [J]. Journal of University of Science and Technology Beijing (北京科技大学学报), 2009, 31(3), 306-311.

[11] Dong J (董杰), Dong J H (董俊华), Han E H (韩恩厚), et al. Corrosion behavior of rusted mild steel under means of wet/dry alternate conditions [J]. Corrosion Science and Protection Technology (腐蚀科学与防护技术), 2006, 18(6): 414-417.

[12] Oh S J, Cook D C, Townsend H E. Atmospheric corrosion of different steels in marine, rural and industrial environments [J]. Corrosion Science, 1999, 41(9): 1687-1702.

[13] Suzuki I, Masuko N, Hisamatsu Y. Electrochemical properties of iron rust [J].Corrosion Science, 1979,19(8): 521-535.

[14] Chen W J (陈文娟), Hao L (郝龙), Dong J H (董俊华), et al. Effect of SO₂ on corrosion evolution of Q235B steel in simulated coastal-industrial atmosphere [J]. Acta Metallurgica Sinica (金属学报), 2014, 50(7): 802-810.

[15] Dong J H (董俊华), Ke W (柯伟). The accelerated test of simulated atmospheric corrosion and the rust evolution of low carbon steel [J]. Journal of Electrochemistry (电化学), 2009, 15(2): 170-178.