Inhibition Effects of Pyrazine and Piperazine on the Corrosion of Mg-10Gd-3Y-0.5Zr Alloy in an Ethylene Glycol Solution

Daobing Huang, Yuanqiang Tu, Guangling Song, Xingpeng Guo

Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, USA.
R & D Center of Wuhan Iron and Steel Co., Wuhan, China.
School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Hubei Key Laboratory of Materials Chemistry and Service Failure, Wuhan, China.

DOI: 10.4236/ajac.2013.46A005                

Abstract

The corrosion and inhibition effect of magnesium-based rare-earth containing alloy Mg-10Gd-3Y-0.5Zr (GW103) was studied in an ethylene glycol (EG) solution mixed with organic inhibitors. The inhibition efficiencies of piperazine and pyrazine inhibitors on the corrosion of GW103 were compared by means of potentiodynamic polarization curve, electrochemical impedance spectroscopy (EIS) and weight loss measurements. It was found that the corrosion process of GW103 alloy in EG solution was hindered by these two inhibitors and the inhibition of pyrazine was more effective than that of piperazine. It was implied that pyrazine could be an effective inhibitor for GW103 in an ethylene glycol coolant solution.

Keywords

GW103; Coolant; Inhibitor; Corrosion

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	X. Guo, J. Chang, S. He, et al., “Investigation of Corrosion Behaviors of Mg-6Gd-3Y-0.4Zr Alloy in NaCl Aqueous Solutions,” Electrochimica Acta, Vol. 52, No. 7, 2007, pp. 2570-2577. doi:10.1016/j.electacta.2006.09.010
[2]	S. M. He, X. Q. Zheng, L. M. Peng, et al., “Microstructure and Strengthening Mechanism of High Strength Mg-10Gd-2Y-0.5Zr Alloy,” Journal of Alloys and Compounds, Vol. 427, No. 1-2, 2007, pp. 316-323. doi:10.1016/j.jallcom.2006.03.015
[3]	S. M. He, X. Q. Zheng, L. M. Peng, et al., “Microstructure Evolution in a Mg-15Gd-0.5Zr Alloy during Isothermal Aging, ” Journal of Alloys and Compounds, Vol. 421, No. 1-2, 2006, pp. 309-312. doi:10.1016/j.jallcom.2005.11.046
[4]	G. Song and D. H. St. John, “Corrosion Behaviour of Magnesium in Ethylene Glycol,” Corrosion Science, Vol. 46, No. 6, 2004, pp. 1381-1399. doi:10.1016/j.corsci.2003.10.008
[5]	D. B. Huang, J. Y. Hu, G.-L. Song and X. P. Guo, “Inhibition Effect of Inorganic and Organic Inhibitors on the Corrosion of Mg-10Gd-3Y-0.5Zr Alloy in an Ethylene Glycol Solution at Ambient and Elevated Temperatures,” Electrochimica Acta, Vol. 56, No. 27, 2011, pp. 10166- 10178. doi:10.1016/j.corsci.2003.10.008