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首页> 外文期刊>Corrosion Engineering, Science and Technology >Pitting corrosion of thixoformed, rheocast and gravity cast A356-T6 alloy in chloride media
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Pitting corrosion of thixoformed, rheocast and gravity cast A356-T6 alloy in chloride media

机译：触变，流变和重力铸造的A356-T6合金在氯化物介质中的点蚀

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摘要

In the research work presented here, the pitting behaviour of thixoformed A356-T6 alloy, with different reheating temperatures, was evaluated and compared with the pitting behaviour of rheocast and gravity cast A356-T6 alloys with the same composition. To study the pitting behaviour, linear sweep voltammetric tests were performed on thixoformed, rheocast and gravity cast A356-T6 alloys in a 3·5%NaCl solution. A simulation method was also used to identify local galvanic corrosion current density between local galvanic couples. Results obtained show that the resistance to pitting corrosion of thixoformed samples formed at 590°C was higher than that of the samples formed at 600°C as well as rheocast and gravity cast samples. The improvement in the pitting corrosion resistance due to the thixoforming process is attributed to morphological aspects of the silicon phase as well as the area effect as related to galvanic corrosion between the silicon particles and the eutectic aluminium phase.
机译：在这里提出的研究工作中，评估了具有不同再加热温度的触变成形A356-T6合金的点蚀行为，并将其与相同成分的流延和重力铸造A356-T6合金的点蚀行为进行了比较。为了研究点蚀行为，在3％5％NaCl溶液中对触变成形，流变铸造和重力浇铸的A356-T6合金进行了线性扫描伏安法测试。还使用一种模拟方法来识别局部电偶之间的局部电偶腐蚀电流密度。获得的结果表明，在590°C下形成的触变成型样品以及在流变和重力铸造样品下的抗点蚀性能都比在600°C下形成的样品高。触变成形工艺导致的耐点蚀性能的提高归因于硅相的形态以及与硅颗粒和低共熔铝相之间电偶腐蚀有关的面积效应。

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  • 来源
    《Corrosion Engineering, Science and Technology》 |2009年第5期|384-388|共5页
  • 作者

    Tahamtan S.; Boostani A. Fadavi; Nazemi H.;

  • 作者单位

    Department of Materials Science and Engineering, Isfahan University of Technology, Isfahan, Iran, Email: tahamtan@ma.iut.ac.ir;

    Department of Materials Science and Engineering, Isfahan University of Technology, Isfahan, Iran;

    Islamic Azad University, Majlesi Branch, Isfahan, Iran;

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