徐秋发
,
庞晓露
,
刘泉林
,
高克玮
金属学报
doi:10.3724/SP.J.1037.2014.00027
利用浸泡实验与电化学实验研究了低合金耐候钢CortenA和碳钢Q235在90℃地下水模拟溶液中的缝隙腐蚀行为.采用SEM,EDS和Raman光谱分析了缝内腐蚀产物膜的形貌和成分.结果表明,2种钢均发生了缝隙腐蚀,且随着腐蚀时间的延长缝隙腐蚀越严重;CortenA的缝隙腐蚀比Q235严重;在中性或偏酸性的溶液中,耐候钢的耐腐蚀性能优于碳钢,而在pH值为1的溶液中,耐蚀性则相反;合金元素Cr,Cu和Si对CortenA在溶液中的耐缝隙腐蚀性能不利.
关键词:
高放废物
,
地下水
,
低合金钢
,
碳钢
,
缝隙腐蚀
X.H Luo
,
T.J. Su
,
C.G Fan
,
Y Y Liand CX Shi(Institute of Metal Research
,
Chinese Academy of Sciences
,
Shenyang 110015
,
China)X Chen and A.M Guo (Iron & Steel Research Institute
,
Wuhan Iron & Steel (Group) Company
,
Wuhan 430083
,
China)
金属学报(英文版)
1.25Cr-0.5Mo steels with different Ti-B or Al-B treatment were exposed in 18 MPa hydrogen atmosphere at 480℃ fo f 100, 500 and 1000 h respectively. Tensile and bend properties of steels before and after hydrogen changing were tested. The results show that the different mechanical properties of the steels with different B content have different responses to high temperature high pressure hydrogen charging processes.After hydrogen changing, more loss of ductility can be found in the steel not treated with B than those in the steels treated with B. Metallographic analyses indicated that decarburization occurred in all the steels. Furthermore, many methane bubbles were found by SEM analysis in the surface decarburization layer in the steel without B,while only a few bubbles, the number and size of which decreased with increasing B content, were found in steels with B treatment. In addition, hydrogen determination results manifested that after being exposed in hydrogen atmosphere the steel containing no B had higher hydrogen content than that of steels containing B. All this suggests that B treatment improved the HA resistance of 1.25Cgr-0.5Mo steel, and the more B the steel contained the more perceptible the effect.
关键词:
boron
,
null
,
null
,
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