Effect of Copper Addition on Corrosion Resistance of Commercial Al-Zn-Mg Alloy Welds(Materials, Metallurgy & Weldability)
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An investigation has been made on the effect of copper addition of 0.17wt% on the corrosion resistance of commercial Al-Zn-Mg alloy welds by means of electrochemical measurement and transmission electron microscopy. The weld cracking was hardly observed in the welds with 0.17wt% copper, and weldability was good. Distributions of hardness in the heat affected zone of welds with copper was similar to that without copper. The corrosion resistance of base metal (T5) was not affected by the copper addition. The corrosion resistance of the bond area of the welds was improved by the copper addition, for the reason of the improvement of microstructure such as grain boundary precipitates, the width of precipitation free zone, and improvement of electrochemical characteristics.
- 大阪大学の論文
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