金属间化合物基层状复合材料Ti/Al3Ti的腐蚀行为

来源期刊:中国有色金属学报2016年第7期

论文作者:姜风春 王帅 韦宁霞 果春焕 刘郢 孟国哲

文章页码:1420 - 1427

关键词:金属间化合物;层状复合材料;腐蚀性能;电化学测试

Key words:intermetallic compound; laminar composite; corrosion resistance; electrochemical testing

摘    要:以TC4钛合金箔片和纯Al箔片为原料,采用真空热压烧结工艺制备单相金属间化合物Al3Ti和金属间化合物基层状复合材料Ti/Al3Ti。采用动电位极化曲线和交流阻抗谱等测试技术,研究对供货态的TC4、随炉热处理的TC4、单相金属间化合物Al3Ti、金属间化合物基层状复合材料Ti/Al3Ti在模拟海水环境下的腐蚀性能,并对腐蚀之后材料表面的形貌及腐蚀产物进行观察和标定,获得单相金属间化合物Al3Ti和金属间化合物基层状复合材料Ti/Al3Ti的耐海水腐蚀性能。结果表明:金属间化合物Al3Ti的耐海水腐蚀性能比层状复合材料Ti/Al3Ti的腐蚀性能要好,但腐蚀性能都比复合材料单元TC4合金的要差;层状复合材料海水浸泡的腐蚀产物主要分布在界面处,且有局部腐蚀现象出现。

Abstract: The monolithic intermetallic tri-aluminide Al3Ti and metal-intermetallic-laminate composite Ti/Al3Ti were synthesized by Ti and Al foils using vacuum sintering process. The corrosion behaviors of TC4 alloys with and without heat treatment, monolithic intermetallic Al3Ti alloy and metal-intermetallic-laminate composite Ti/Al3Ti in marine environments were studied using potentiodynamic polarization curve, AC impedance. The surface morphologies and corrosion products of these materials were observed and analyzed,the corrosion-resistance monolithic intermetallic tri-aluminide Al3Ti and metal-intermetallic-laminate composite Ti/Al3Ti were obtained. The experimental results show that the monolithic intermetallic tri-aluminide Al3Ti has a good corrosion resistance comparing with the laminated composite Ti/Al3Ti, while their corrosion resistances are both poor than that of TC4 alloy. The corrosion products mainly distribute at the interface, and a local corrosion is found to occur in the metallic intermetallic laminate composite in marine environments.

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