TA15合金Cr-Si复合渗层的热腐蚀行为  

Hot Corrosion Behavior of Cr-Si Co-Alloyed layer in TA15 Alloy

作　　者：裴秋旭 梁文萍[1] 缪强[1] 任蓓蕾[1] 王昉[1] 贲能军[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京211100

出　　处：《热处理》2016年第2期6-11,共6页Heat Treatment

基　　金：国家自然科学基金(51474131);江苏高校优势学科建设工程资助项目;江苏省普通高校研究生科研创新计划项目(KYLX15_0309)

摘　　要：采用双层辉光等离子表面冶金技术对TA15合金进行了Cr-Si复合渗处理,以形成Cr-Si复合渗层。随后将TA15合金置于700℃硫酸钠(Na_2SO_4)盐浴中热腐蚀100 h,以研究Cr-Si复合渗层能否提高TA15合金的热腐蚀性能。结果表明,经Cr-Si复合渗的TA15合金热腐蚀增重较无Cr-Si复合渗层的TA15合金大大减小,即Cr-Si复合渗明显提高了TA15合金的耐热腐蚀性能。其原因是,Cr-Si复合渗层均匀、致密,在热腐蚀过程中形成Cr_2O_3和SiO_2氧化膜,保护合金不受腐蚀。The impregnation of TA15 alloy with both chromium and silicon was performed by employing a double glow plasma surface metallurgy technology to form a Cr-Si co-alloyed case. Subsequently, the TA15 alloy was subjected to hot corrosion in a molten sodium sulphate （Na2SO4 ） salt at 700 ℃ for 100 h to reveal whether the Cr- Si co-alloyed case could render the resistance to hot corrosion of the TA15 alloy better. The results indicate that surrosion of the TA15 alloy with the Cr - Si co-alloyed ease is much less than that of the TA15 alloy free from the Cr-Si co-alloyed case,i, e., the resistance to hot corrosion of the TA15 alloy is significantly improved due to the Cr- Si co-alloyed case, because the Cr-Si co-alloyed case is uniform and dense, and oxide films such Cr203 and SiO2 are formed in course of hot corrosion on its surface, thus protecting the alloy from being corroded.

关 键 词：TA15合金 双层辉光等离子表面冶金技术 Cr-Si复合渗层 热腐蚀 

分 类 号：TG156.8[金属学及工艺—热处理]