添加CaO或Y的ZK40镁合金的腐蚀行为

• Published in: 中国有色金属学报（英文版） Vol. 28; no. 3; pp. 427 - 439
• Main Authors: Ricardo Henrique BUZOLIN, Marta MOHEDANO, Chamini Lakshi MENDIS, Beatriz MINGO, Domonkos TOLNAI, Carsten BLAWERT, Karl Ulrich KAINER, Haroldo PINTO, Norbert HORT
• Format: Journal Article
• Language: Chinese
• Published: Departamento de Ciencia de Materiales, Facultad de Ciencias Químicas, Universidad Complutense, Av. Complutense, s/n, 28040 Madrid, Spain%Magnesium Innovation Centre, Helmholtz-Zentrum Geesthacht, Max-Planck-Strasse 1, D 21502, Geesthacht, Germany 2018; Institute of Materials Science, Joining and Forming, Graz University of Technology, Kopernikusgasse 24/I, 8010 Graz, Austria%Magnesium Innovation Centre, Helmholtz-Zentrum Geesthacht, Max-Planck-Strasse 1, D 21502, Geesthacht, Germany; Brunel Centre for Advanced Solidification Technology, Brunel University London, Uxbridge, Middlesex, UB8 3PH, UK%Departamento de Ciencia de Materiales, Facultad de Ciencias Químicas, Universidad Complutense, Av. Complutense, s/n, 28040 Madrid, Spain%Magnesium Innovation Centre, Helmholtz-Zentrum Geesthacht, Max-Planck-Strasse 1, D 21502, Geesthacht, Germany%Department of Materials Engineering, University of Sao Paulo, Av. Joao Dagnone, 1100 Jd. Sta Angelina, 13563-120, Sao Carlos, Brazil; Magnesium Innovation Centre, Helmholtz-Zentrum Geesthacht, Max-Planck-Strasse 1, D 21502, Geesthacht, Germany
• Subjects: Y添加; 镁合金; Mg alloy; ZK40; corrosion behaviour; Y addition; CaO addition; CaO添加; 腐蚀行为
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(18)64676-X

研究了铸造 ZK40、添加2% (质量分数)CaO和添加1% (质量分数)Y 的ZK40 镁合金的微观组织,并表征了金属间化合物相的形貌和分布.利用ZK40晶界处分散的金属间化合物颗粒,将添加了CaO或Y的ZK40的微观组织调整为沿晶界分布的金属间化合物的半连续网络结构.微观组织中没有检测到CaO, Ca 存在于铸造过程中形成的金属间化合物Ca2Mg6Zn3中.析氢和电化学交流阻抗谱分析显示,添加CaO后合金的耐腐性略有提高,而添加 Y 却对 ZK40的耐腐蚀性有负面影响.浸泡试验结果显示,严重的局部腐蚀和沿金属间化合物的腐蚀对ZK40-Y合金的腐蚀过程有重要影响,而ZK40 和ZK40-CaO 合金的局部腐蚀不明显.ZK40合金中α-Mg 基体中的显微偏析明显高于加 CaO 或 Y 的 ZK40合金,这种作用结合合金表面形成了更加稳定的耐腐蚀层是ZK40-CaO合金的耐腐蚀性能提高的主要原因.