Effect of Heat Treatment on Corrosion Resistance of Mg-3Sn-2Al-1Zn-5Li Alloy
The Mg-3Sn-2Al-1Zn-5Li alloy was heat treated in different ways.The corrosion electrochemical behavior of the heat-treated alloy by different ways was studied by electrochemical testing in 3.5％NaCl solution.The corrosion morphology and the composition of corrosion products were analyzed by scanning electron microscopy,energy spectrum and X-ray diffraction.The results show that the corrosion resistance of the alloy was improved after solution and aging treatment,and the solution-treated Mg-3Sn-2Al-1Zn-5Li alloy had the best corrosion resistance.The corrosion characteristic of the alloy was filiform corrosion,and the main corrosion product was Mg(OH)2.
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