Microstructure and corrosion behavior of Al3Ti/ADC12 composite modified with Sr
来源期刊：International Journal of Minerals Metallurgy and Materials2018年第7期
论文作者：Bao-biao Yu Hong Yan Qing-jie Wu Zhi Hu Fan-hui Chen
文章页码：840 - 848
摘 要：In this study, we investigated the effect of the addition of Sr（0 wt%, 0.1 wt%, 0.2 wt%, and 0.3 wt%） on the microstructure and corrosion behavior of Al3Ti/ADC12 composite by optical microscopy, X-ray diffraction, scanning electron microscopy, and energy diffraction spectroscopy. The results reveal that the α-Al phases were nearly spherical and 40 μm in size and that the eutectic Si phases became round in the composite when the Sr content reached 0.2 wt%. The Al3Ti particles were distributed uniformly at the grain boundary. The results of the corrosion examination reveal that the Al3Ti/ADC12 composite exhibited a minimum corrosion rate of 0.081 g×m–2×h–1 for an Sr content of 0.2 wt%, which is two thirds of that of unmodified composite(0.134 g×m–2×h–1). This improved corrosion resistance was due to galvanic corrosion, which resulted from the low area ratio of the cathode to anode regions. This caused a low-density corrosion current in the composite, thereby yielding optimum corrosion resistance.
Bao-biao Yu，Hong Yan，Qing-jie Wu，Zhi Hu，Fan-hui Chen
School of Mechanical and Electrical Engineering, Nanchang University
摘 要：In this study, we investigated the effect of the addition of Sr（0 wt%, 0.1 wt%, 0.2 wt%, and 0.3 wt%） on the microstructure and corrosion behavior of Al3Ti/ADC12 composite by optical microscopy, X-ray diffraction, scanning electron microscopy, and energy diffraction spectroscopy. The results reveal that the α-Al phases were nearly spherical and 40 μm in size and that the eutectic Si phases became round in the composite when the Sr content reached 0.2 wt%. The Al3Ti particles were distributed uniformly at the grain boundary. The results of the corrosion examination reveal that the Al3Ti/ADC12 composite exhibited a minimum corrosion rate of 0.081 g×m–2×h–1 for an Sr content of 0.2 wt%, which is two thirds of that of unmodified composite(0.134 g×m–2×h–1). This improved corrosion resistance was due to galvanic corrosion, which resulted from the low area ratio of the cathode to anode regions. This caused a low-density corrosion current in the composite, thereby yielding optimum corrosion resistance.
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