为探讨局部腐蚀对探针读数的影响，采用扫描电镜、金相显微镜、能谱等表征方法对20号碳钢探针的失效进行了研究。宏观和微观形貌表明，探针表面随机分布着大小不均的腐蚀坑；金相结果表明，探针材质合格，晶体组织均匀；能谱分析表明，腐蚀坑内存在氯离子和硫元素的局部聚集现象。不均匀的覆盖物在探针表面的形成，以及在电位差及腐蚀介质的影响下，探针表面发生了局部电化学腐蚀，较多腐蚀坑的出现引起了感应电阻信号的跳动，产生了数据的失真。
The data distortion of a 20# steel probe was analyzed by SEM,metallographic microscopy and EDS.The macro and micro morphologies showed that some corrosion pits were distributed on the surface of the probe.The results of metallographic analysis revealed that the material of the probe was qualified and the crystal structure was uniform.The results obtained from EDS indicated that some chloride ions and sulfur element were accumulated in the corrosion pits.The un-uniform covering and the influence of corrosive medium caused the localized electrochemical corrosion and even induced some corrosion pits.More corrosion pits resulted in moer change of the value of resistance and thus induced the data distortion.
参考文献
| [1] | 郑丽群,万泽贵,高楠,张承峰.炼化装置腐蚀监测技术应用及进展[J].石油化工腐蚀与防护,2012(02):4-7,50. |
| [2] | 周玉波,邵丽艳,李言涛,侯保荣,于志刚.腐蚀监测技术现状及发展趋势[J].海洋科学,2005(07):77-80. |
| [3] | 陈学群,常万顺,陈德斌.碳钢中夹杂物诱发点蚀的规律和特性研究[J].海军工程大学学报,2004(06):30-36. |
| [4] | 曹玉亭,申海平.石油加工中的环烷酸腐蚀及其控制[J].腐蚀科学与防护技术,2007(01):45-48. |
| [5] | 董家梅,孙绪新.缓蚀剂防腐及其在石油机械中的应用[J].石油机械,2000(05):18-21. |
| [6] | 张恒,陈学群,常万顺.冶金因素对钢点蚀诱发敏感性的影响[J].中国腐蚀与防护学报,2009(02):127-131. |
| [7] | 赵景茂,左禹,熊金平.碳钢在点蚀/缝隙腐蚀闭塞区模拟溶液中的腐蚀行为[J].中国腐蚀与防护学报,2002(04):193-197. |
| [8] | 陈惠玲,李晓娟,魏雨.碳钢在含氯离子环境中腐蚀机理的研究[J].腐蚀与防护,2007(01):17-19. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%