Effect of indium addition on corrosion of AP65 magnesium alloy

Abstract

The effect of indium addition on the corrosion behavior of AP65 Mg alloy was examined. The indium modified AP65 exhibits accelerated pitting corrosion and overall corrosion, but there is almost no incubation period at the onset of corrosion. Polarization curve measurements indicate that the indium modified AP65 has more negative corrosion potential, which is an improvement aspect of the electrochemical activation. The corrosion current density increases from 0.126 to 0.868 mA/cm² with and without 2.0% (mass fraction) indium addition. The mean potentials of AP65 negatively shift from −1.491 V to −1.584 V by adding 2.0% indium. The effect of indium addition on the corrosion performance of AP65 seems to be associated with the decrease of cathode-to-anode area ratio of the alloy, which may change the electrochemical anode and cathode polarization behavior of the alloy.

Keywords

magnesium alloy / corrosion / electrochemical properties / indium

References

[1] FengY., WangR.-c., PengC.-q., WangN.-guang.. Influence of Mg₂₁Ga₅Hg₃ compound on electrochemical properties of Mg-5%Hg-5%Ga alloy [J]. Transactions of Nonferrous Metals Society of China, 2009, 19(1): 154-159

[2] RenukaR.. Influence of allotropic modifications of sulphur on the cell voltage in Mg-CuI(S) seawater activated battery [J]. Materials Chemistry and Physics, 1999, 59(1): 42-48

[3] DoronA., GurukarS. S., ElenaL., ArielM., OrenM., OritC., MichelaB.. Progress in rechargeable magnesium battery technology [J]. Advanced Materials, 2007, 19: 4260-4267

[4] RenukaR.. AgCl and Ag₂S as additives to CuI in Mg-CuI seawater activated batteries [J]. Journal of Applied Electrochemistry, 1997, 27(12): 1394-1397

[5] SongG.-ling.. Effect of tin modification on corrosion of AM70 magnesium alloy [J]. Corrosion Science, 2009, 51(9): 2063-2070

[6] FengY., WangR.-c., YuK., PengC.-q., ZhangJ.-p., ZhangChun.. Activation of Mg-Hg anodes by Ga in NaCl solution [J]. Journal of Alloys and Compounds, 2009, 473(1/2): 215-219

[7] MaZ.-q., LiW.-x., YuK., WangR.-c., LiangY., CaoJ.-j., YiN., LiX.-hai.. Electrochemical characteristics of magnesium alloys in synthetic seawater [J]. Materials Protection, 2002, 35(1): 16-18

[8] QuQ., MaJ., WangL., LiL., BaiW., DingZ.-tao.. Corrosion behaviour of AZ31B magnesium alloy in NaCl solutions saturated with CO₂ [J]. Corrosion Science, 2011, 53(4): 1186-1193

[9] ZhaoH.-y., BianP., JuD.-ying.. Electrochemical performance of magnesium alloy and its application on the sea water battery [J]. Journal of Environmental Sciences, 2009, 21(Supplement): 88-91

[10] SONG Guang-ling. Corrosion and protection of Mg alloys [M]. Beijing Chemical Industry Press, 2006: 38–40.

[11] ZhaoM.-c., LiuM., SongG.-l., AtrensA.. Influence of the β-phase morphology on the corrosion of the Mg alloy AZ91 [J]. Corrosion Science, 2008, 50(7): 1939-1953

[12] WangN.-g., WangR.-c., PengC.-q., FengY., ZhangX.-yu.. Corrosion behavior of Mg-Al-Pb and Mg-Al-Pb-Zn-Mn alloys in 3.5% NaCl solution [J]. Transactions of Nonferrous Metals Society of China, 2010, 20(10): 1936-1943

[13] WangN.-g., WangR.-c., PengC.-q., FengY., ZhangX.-yu.. Influence of aluminum and lead on activation of magnesium as anode [J]. Transactions of Nonferrous Metals Society of China, 2010, 20(8): 1403-1411

[14] ZazouaA., AzzouzN.. An investigation on the use of indium to increase dissolution of Al Zn anodes in sea water [J]. Materials and Design, 2008, 29(4): 806-810

[15] HuoH.-w., LiY., WangF.-hui.. Corrosion of AZ91D magnesium alloy with a chemical conversion coating and electroless nickel layer [J]. Corrosion Science, 2004, 46(6): 1467-1477

[16] LiuW.-j., CaoF.-h., ChangL.-r., ZhangZ., ZhangJ.-qing.. Effect of rare earth element Ce and La on corrosion of behavior of AM60 magnesium alloy [J]. Corrosion Science, 2009, 51(6): 1334-1343

[17] SongG.-l., AtrensA.. Understanding magnesium corrosion-A framework for improved alloy performance [J]. Advanced Engineering Materials, 2003, 11(5): 837-858

[18] SongG.-ling.. Recent progress in corrosion and protection of Mg alloys [J]. Advanced Engineering Materials, 2005, 7(7): 563-586

[19] AmbatR., AungN. N., ZhouW.. Evaluation of micro-structural effects on corrosion behavior of AZ91D magnesium alloy [J]. Corrosion Science, 2000, 42(8): 1433-1455

[20] ZhaoM.-c., LiuM., SongG.-l., AtrensA.. Influence of pH and chloride ion concentration on the corrosion of Mg alloy ZE41 [J]. Corrosion Science, 2008, 50(11): 3168-3178

[21] ShiZ.-m., LiuM., AtrensA.. Measurement of the corrosion rate of magnesium alloys using Tafel extrapolation [J]. Corrosion Science, 2010, 52(2): 579-588