材料科学
腐蚀
硼酸
金属
电偶腐蚀
点蚀
复合数
复合材料
阳极
极化(电化学)
冶金
电极
化学
物理化学
有机化学
出处
期刊:Materials Science Forum
日期:2016-11-01
卷期号:877: 530-536
被引量:7
标识
DOI:10.4028/www.scientific.net/msf.877.530
摘要
The corrosion behavior of Al-B 4 C metal matrix composites in H 3 BO 3 solutions with different Cl - contents was investigated using potentiodynamic polarization and zero resistance ammetry techniques. Results show that the corrosion of Al-B 4 C composites in H 3 BO 3 solution increases with increasing B 4 C volume fraction in the composites. The main corrosion characteristic of Al-B 4 C composites in H 3 BO 3 solution is the galvanic corrosion between Al matrix and B 4 C particles. In the galvanic couple, B 4 C particle acts as cathode and Al matrix acts as anode. The cathodic reaction is hydrogen revolution reaction, which controls the corrosion mechanism of Al-B 4 C composites. Pitting is not observed on the composite surface in the H 3 BO 3 solution with zero Cl - . However, with addition of Cl - in H 3 BO 3 solution, pitting occurs and the corrosion resistance remarkably decreases with increasing Cl - content. The corrosion resistance of Al-B 4 C composites in H 3 BO 3 solutions is compared with that in the standard 3.5% NaCl solution.
科研通智能强力驱动
Strongly Powered by AbleSci AI