Studies on galvanic corrosion of iron-magnesium couple by scanning electrochemical microscopy in 0.1 M NaCl solution

X. Joseph Raj; T. Nishimura

Journal of Industrial and Engineering Chemistry, Vol.41, 141-150, September, 2016

DOI10.1016/j.jiec.2016.07.020 Export Citation

Studies on galvanic corrosion of iron-magnesium couple by scanning electrochemical microscopy in 0.1 M NaCl solution

X. Joseph Raj^{1, 2, †}, and T. Nishimura^{1, 3}

¹Materials Recycling Design Group, Research Center for Strategic Materials, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba,Ibaraki 305-0047, Japan
²Department of Chemistry, Vel Tech Dr.RR & Dr.SR Technical University, Avadi, Chennai 600 062, Tamil Nadu, India
³, Japan

E-mail:

Scanning electrochemical microscopy (SECM) was used to monitor the corrosion processes occurring at Fe/Mg couple immersed in 0.1 M NaCl aqueous solution. The release of Fe2+ ions, Mg2+ ions and the consumption of dissolved oxygen was successfully monitored as a function of time by setting the tip potential at +0.60 V, -1.6 V and -0.75 V respectively. The results revealed that the Fe/Mg couple away from each other showed a decrease in current values with time. The decrease in current at Fe/Mg is due to the formation of oxide layer of Mg and the corrosion products over the Fe with times.

Keywords:SECM;Galvanic couple;Corrosion;Iron;Magnesium

[References]

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Bastos AC, Simoes AM, Gonzalez S, Gonzalez-Garcıa Y, Souto RM, Prog. Org. Coat., 53, 177 (2005)

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[2] Khobaib M, Rensi A, Matakis T, Donley MS, Prog. Org. Coat., 41, 266 (2001)

[3] He J, Gelling VJ, Tallman DE, Bierwagen GP, J. Electrochem. Soc., 147(10), 3661 (2000)

[4] Souto RM, Gonzalez-Garcia Y, Gonzalez S, Prog. Org. Coat., 65, 435 (2009)

[5] Santana JJ, Gonzalez-Guzman J, Fernandez-Merida L, Gonzalez S, Souto RM, Electrochim. Acta, 55(15), 4488 (2010)

[6] Gonzalez S, Santana JJ, Gonzalez-Garcia Y, Fernandez-Merida L, Souto RM, Corrosion Sci., 53, 1910 (2011)

[7] Bastos AC, Simoes AM, Gonzalez S, Gonzalez-Garcıa Y, Souto RM, Electrochem. Commun., 6, 1212 (2004)

[8] Lister TE, Pinhero PJ, Electrochim. Acta, 48(17), 2371 (2003)

[9] Eckhard K, Etienne M, Schulte A, Schuhmann W, Electrochem. Commun., 9, 1793 (2007)

[10] Davoodi A, Pan J, Leygraf C, Norgren S, Electrochim. Acta, 52(27), 7697 (2007)

[11] Simoes AM, Bastos AC, Ferreira MG, Gonzalez-Garcıa Y, Gonzalez S, Souto RM, Corrosion Sci., 49, 726 (2007)

[12] Izquierdo J, Santana JJ, Gonzalez S, Souto RM, Electrochim. Acta, 55(28), 8791 (2010)

[13] Souto RM, Gonzalez-Garcia Y, Gonzalez S, Corrosion Sci., 50, 1637 (2008)

[14] Souto RM, Gonzalez-Garcia Y, Izquierdo J, Gonzalez S, Corrosion Sci., 52, 748 (2010)

[15] Tada E, Satoh S, Kaneko H, Electrochim. Acta, 49(14), 2279 (2004)

[16] Bastos AC, Simoes AM, Gonzalez S, Gonzalez-Garcıa Y, Souto RM, Prog. Org. Coat., 53, 177 (2005)