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Electrochemical corrosion behaviors of a stress-aged Al-Zn-Mg-Cu alloy

机译:应力时效Al-Zn-Mg-Cu合金的电化学腐蚀行为

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摘要

The effects of stress-aging processing on corrosion resistance of an Al-Zn-Mg-Cu alloy were investigated. It is found that the one-stage stress-aged alloy is strongly sensitive to the electrochemical corrosion. The poor corrosion resistance of the one-stage stress-aged alloy can be attributed to fine intragranular aging precipitates and continuous distribution of grain boundary precipitates. Meanwhile, the incomplete precipitation of solute atoms results in high electrochemical activity of aluminum matrix. However, when the alloy is two-stage stress-aged, the corrosion resistance is greatly improved. Furthermore, the corrosion resistance decreases firstly and then increases with increasing the first stage stress-aging temperature. Increasing external stress can enhance the corrosion resistance of the two-stage stress-aged alloy. These phenomena are mainly related to aging precipitates within grains and along grain boundaries. The coarse and relatively low-density intragranular aging precipitates, as well as the discontinuously distributed grain boundary precipitates can enhance the corrosion resistance of the stress-aged alloy.
机译:研究了应力时效处理对Al-Zn-Mg-Cu合金耐蚀性的影响。发现一级应力时效合金对电化学腐蚀非常敏感。一级时效时效合金的耐蚀性差可归因于细小的晶粒内时效沉淀物和晶界沉淀物的连续分布。同时,溶质原子的不完全沉淀导致铝基体的高电化学活性。但是,当合金处于两阶段的应力时效状态时,耐蚀性大大提高。此外,随着第一阶段的应力时效温度升高,耐蚀性首先降低,然后增加。增加外部应力可以增强两阶段应力时效合金的耐蚀性。这些现象主要与晶粒内和沿晶界的时效沉淀有关。粗大且密度相对较低的晶内时效析出物以及不连续分布的晶界析出物可以提高应力时效合金的耐蚀性。

著录项

  • 来源
    《Journal of Materials Research》 |2016年第16期|2493-2505|共13页
  • 作者单位

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China, Light Alloy Research Institute, Central South University, Changsha 410083, Hunan Province, China, and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China, and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China, and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China, and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China;

    SINTEF Materials and Chemistry, Blindern, 0314 Oslo, Norway;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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