摘要
用电化学方法、实验室全浸实验和X射线应力分析技术研究了退火温度对碳化硅颗粒增强 2 0 2 4铝 (SiCp/2 0 2 4Al)基复合材料腐蚀行为的影响 ,并用扫描电子显微镜 (SEM )观察了腐蚀前后的微观形貌 .结果表明 ;高温退火条件下材料的腐蚀电位Ecorr和孔蚀电位Epit均有较大程度的负移 ,但退火温度的不同对SiCp/ 2 0 2 4Al基复合材料抗局部腐蚀能力影响不大 ;退火温度升高 ,由于富铜相析出增加及热失配造成的微缝隙增多而使材料的腐蚀坑变多、变浅、均匀化程度加深 .
The influence of anneal temperature on the corrosion behavior of SiCp/2024Al composite was investigated by electrochemical method and laboratory immersion test and X-ray stress analyze technique,also SEM was used to observe the micrograph.The results show that E pit and E corr are more negative at high anneal temperature,but the anneal temperature shows little effect on local corrosion resistance of SiCp/2024Al;The number of corrosion pits obviously increased but the pits became smaller and shallower with the increase of anneal temperature,which may resulted in increament of precipitated rich-Cu phase,and then more crevics may be promoted due to thermal mismatch between SiC particle and Al matrix.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2004年第3期144-146,共3页
Corrosion Science and Protection Technology
