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Evaluation of the effect of ageing heat treatment on corrosion resistance of Al-Ag alloy using electrochemical methods

机译：用电化学方法评估时效热处理对Al-Ag合金耐蚀性的影响

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摘要

The corrosion resistance behavior of age-treated at 250℃, 150℃ and solution-treated at 540℃ Al-4.2 wt%Ag alloys were investigated in a 3.5 wt% NaCl solution using cyclic potentiodynamic polarization (CPP) and electrochemical impedance spectroscopy measurements. Furthermore, the Vickers microhardness, microstructure, and phase analysis were studied by Vickers microhardness test, scanning electron microscopy (SEM), and x-ray diffraction. The Vickers microhardness test indicated significant increase in the hardness of the aged samples due to precipitation formation in the Al matrix. SEM images of all samples after corrosion tests showed pitting corrosion. Furthermore, it is found that the presence of ageing precipitates (Ag_2Al plates) in the age-treated samples created local galvanic cells and can led to the formation of the anodic and cathodic sites. Hence, the corrosion resistance decreased compared to the solution-treated sample without any precipitates. In addition, for more ageing temperature at 250℃ in comparison with 150℃, was made more anodic and cathodic sites due to more Ag_2Al precipitates formation, and decreased resistance to pitting corrosion. Besides, the aluminum and silver oxides were corrosion products. The major phase was aluminum oxide because the Al was the main element of the alloy.
机译：使用循环电位极化（CPP）和电化学阻抗谱测量方法，研究了在3.5 wt％的NaCl溶液中，分别对在250℃，150℃时效和540℃时效处理的Al-4.2 wt％Ag合金的耐蚀性能。此外，通过维氏显微硬度测试，扫描电子显微镜（SEM）和X射线衍射研究了维氏显微硬度，显微组织和相分析。维氏显微硬度测试表明，由于在铝基体中形成沉淀，老化样品的硬度显着增加。腐蚀测试后所有样品的SEM图像均显示点蚀。此外，发现在经过老化处理的样品中存在老化的沉淀物（Ag_2Al板）会产生局部原电池，并可能导致形成阳极和阴极。因此，与没有任何沉淀的固溶处理样品相比，耐腐蚀性降低。另外，与250℃相比，在250℃时效温度更高，由于形成了更多的Ag_2Al沉淀，降低了抗点蚀的能力，因此使阳极和阴极部位更多。此外，铝和银的氧化物是腐蚀产物。主相是氧化铝，因为Al是合金的主要元素。

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  • 来源
    《Journal of Materials Research》 |2016年第16期|2457-2464|共8页
  • 作者

    Pooria Afzali; Mardali Yousefpour; Ehsan Borhani;

  • 作者单位

    Faculty of Materials and Metallurgical Engineering, Semnan University, Semnan, 35131-19111, Iran;

    Faculty of Materials and Metallurgical Engineering, Semnan University, Semnan, 35131-19111, Iran;

    Faculty of Materials and Metallurgical Engineering, Semnan University, Semnan, 35131-19111, Iran;

  • 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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