Influence of Micro/Nano-Ti Particles on the Corrosion Behavior of AZ31-Ti Composites  

作　　者：Jinchao Jiao Jin Zhang Yong Lian Shengli Han Kaihong Zheng Fusheng Pan 

机构地区：[1]Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 10083,China [2]Beijing Key Laboratory for Corrosion Erosion and Surface Technology,Beijing 100083,China [3]Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510650,China [4]National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 404100,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第3期484-498,共15页金属学报（英文版）

基　　金：funded by the Guangdong Major Project of Basic and Applied Basic Research (Grant No.2020B0301030006)。

摘　　要：Adding Ti particles to magnesium alloy simultaneously enhances its strength and ductility.However,how these particles influence on Mg alloy’s corrosion performance is seldom reported.The corrosion behavior of AZ31-Ti composites containing titanium nanoparticles(1.5 and 5 wt%)and micron particles(10 wt%)prepared by powder metallurgical in 3.5 wt%NaCl solution was investigated.The results indicate that Ti particles serve as the primary location for the cathodic hydrogen reduction reaction,resulting in intense galvanic corrosion between the Ti and Mg matrix.Ti nanoparticles distributed at the interface of the original AZ31 powder were in a discontinuous mesh structure,thus failing to act as a barrier against corrosion.The corrosion products with the existence of numerous cracks gradually peel off during the corrosion process and cannot protect the matrix.The average corrosion rate P_(w) of AZ31,AZ31-1.5%Ti,AZ31-5%Ti,and AZ31-10%Ti after 7 days of immersion is 27.55,105.65,283.67,and 99.35 mm/y,respectively.Therefore,AZ31-Ti composites can be considered as potential candidates for degradable fracturing tools.Otherwise,it is recommended to improve their corrosion resistance through surface treatment.

关 键 词：AZ31-Ti composite NANO-TI MICRO-TI Corrosion behavior Scanning Kelvin probe force microscopy(SKPFM) 

分 类 号：TB331[一般工业技术—材料科学与工程] TG174.3[金属学及工艺—金属表面处理]