Electrochemical investigation of the influence of laser surface melting on the microstructure and corrosion behaviour of ZE41 magnesium alloy – An EIS based study |
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| Authors: | P Chakraborty Banerjee RK Singh Raman Y Durandet G McAdam |
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| Affiliation: | aDepartment of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia;bCAST Cooperative Research Centre, Hawthorn, VIC 3122, Australia;cDepartments of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia;dIndustrial Research Institute Swinburne (IRIS), Swinburne University of Technology, Hawthorn, VIC 3122, Australia;eDefence Science and Technology Organisation, Fishermans Bend, VIC 3207, Australia |
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| Abstract: | Surface melting of a magnesium alloy, ZE41 (4%-Zn, 1%-RE) was performed to achieve electrochemical homogeneity at the surface by microstructure refinement. Large secondary precipitates are particularly known to cause severe pitting in magnesium alloys. The corrosion resistance of the laser treated and untreated alloy was investigated by potentiodynamic polarisation and electrochemical impedance spectroscopy. Contrary to the reported behaviour of other magnesium alloys (such as AZ series alloys), laser surface melting did not significantly improve the corrosion resistance of ZE41. This observation is attributed to the absence of beneficial alloying elements such as Al in ZE41 alloy. |
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| Keywords: | A Magnesium B EIS B Polarisation |
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