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Plasticity and corrosion resistance of magnesium alloy WE43

Wlake W., Hadasik E., Przondziono J., Kuc D., Bednarczyk I., Niewielski G.

Archives of Materials Science and Engineering

2011

Vol. 51, nr 1

16-24

Purpose: The purpose of this study was to assess the extent to which magnesium alloy WE43 is susceptible to metal forming and to assess its structure after hot forming. Corrosion resistance evaluation of WE43 alloy in NaCl solutions, after casting and extrusion forging, was also made. Basic groups of magnesium alloys for plastic forming were characterised. Design/methodology/approach: Formability of magnesium alloy WE43 was determined on the ground of uni-axial compression tests in the temperature from 200 to 450°C and with deformation rate within the range from 0.01 to 10 s-1. The structure of the alloy after hot forming was presented. Corrosion tests of magnesium alloy WE43 were carried out in solutions with concentration of 0.01-2 M NaCl with application of electrochemical testing system VoltaLabŽPGP201. Electrochemical corrosion resistance was evaluated on the ground of registered anodic polarisation curves by means of potentiodynamic method. Findings: It was proved that resistance of magnesium alloy WE43 in temperature range from 200 to 300°C is limited. It was found that recrystallization begins during strain application at the temperature of 350°C. Strain at the temperature of 450°C guarantees full recrystallization of the alloy. The results of carried out corrosion tests explicitly show deterioration of corrosion characteristics of magnesium alloy WE43 together with increase of molar concentration of NaCl solution. Practical implications: The tests results regarding the effect of strain parameters on magnesium alloy WE43 formability may be employed in preparation of metal forming technology for the alloy. In corrosion tests it was proved that irrespective of molar concentration of NaCl solution, pitting corrosion is present in the tested alloy. It proves it is necessary to apply protective layers on elements made of WE43 alloy, irrespective of its state of delivery. Originality/value: Tests of technological plasticity enabled to determine the dependence of yield stress on temperature and rate of strain. Electrochemical corrosion tests showed that WE43 alloy obtained in extrusion features slightly higher corrosion characteristics.