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Microstructure and corrosion behavior of Al3Ti/ADC12 composite modified with Sr
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作者 bao-biao yu hong yan +2 位作者 qing-jie wu zhi hu fan-hui chen 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第7期840-848,共9页
In this study, we investigated the effect of the addition of Sr (0wt%, 0. lwt%, 0.2wt%, and 0.3wt%) on the microstaalcture and cor- rosion behavior of A13Ti/ADC12 composite by optical microscopy, X-ray diffraction, ... In this study, we investigated the effect of the addition of Sr (0wt%, 0. lwt%, 0.2wt%, and 0.3wt%) on the microstaalcture and cor- rosion behavior of A13Ti/ADC12 composite by optical microscopy, X-ray diffraction, sca^lning electron microscopy, mid energy diffraction spectroscopy. The results reveal that the c^-A1 phases were nearly spherical mid 40 gin in size and that the eutectic Si phases became round in the composite when the Sr content reached 0.2wt%. The A13Ti paxticles were distributed uniformly at the grain boundary. The results of the corrosion examination reveal that the A13Ti/ADC12 composite exhibited a minimum corrosion rate of 0.081 g.m 2,hl for an Sr content of 0.2wt%, which is two thirds of that of umnodified composite (0.134 g.m4.h 1). This improved corrosion resistaalce was due to galvamc cor- rosion, 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 resistmlce. 展开更多
关键词 Sr modification A13Ti/ADC 12 composite microstxucture corrosion behavior
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