低铬X65管线钢CO<sub>2</sub>腐蚀产物膜的特征及形成机制

金属学报

2009, Vol. 45

Issue (1): 84-90

论文

本期目录 | 过刊浏览

低铬X65管线钢CO₂腐蚀产物膜的特征及形成机制

孙建波¹;柳伟¹;常炜²;张忠铧³;李忠涛²;于湉²; 路民旭¹

1 北京科技大学材料科学与工程学院; 北京 100083
2 中海石油(中国)有限公司研究中心; 北京 100027
3 宝山钢铁股份有限公司技术中心; 上海 201900

CHARACTERISTICS AND FORMATION MECHANISM OF CORROSION SCALES ON LOW--CHROMIUM X65 STEELS IN CO₂ ENVIRONMENT

SUN Jianbo¹;LIU Wei¹;CHANG Wei²;ZHANG Zhonghua³;LI Zhongtao²;YU Tian²;LU Minxu¹

1 School of Materials Science and Engineering; University of Science and Technology Beijing; Beijing 100083
2 Research Center; China National Offshore Oil Corporation; Beijing 100027
3 Technology Center; Baoshan Iron and Steel Corp.; Ltd.; Shanghai 201900

引用本文:

孙建波柳伟常炜张忠铧李忠涛于湉路民旭. 低铬X65管线钢CO₂腐蚀产物膜的特征及形成机制[J]. 金属学报, 2009, 45(1): 84-90.
, , , , , , . CHARACTERISTICS AND FORMATION MECHANISM OF CORROSION SCALES ON LOW--CHROMIUM X65 STEELS IN CO₂ ENVIRONMENT[J]. Acta Metall Sin, 2009, 45(1): 84-90.

全文: PDF(1041 KB)

摘要:

利用高温高压CO₂腐蚀模拟实验以及ESEM, EDS, XPS和SEM等分析技术, 研究了4种不同含Cr量的X65管线钢的腐蚀速率、腐蚀形态和腐蚀产物膜结构特征. 结果表明: 含Cr量高的钢平均腐蚀速率小, 无Cr和含1\%Cr的钢的腐蚀形态为局部腐蚀, 含3%和5%Cr的钢的腐蚀形态为全面腐蚀. 在高温高压CO₂腐蚀环境中, 含Cr钢的腐蚀产物膜为FeCO₃和Cr(OH)₃竞争沉积形成的多层结构, 其中1Cr-X65和3Cr-X65的腐蚀膜具有3层结构, 5Cr-X65的腐蚀膜是双层结构. Cr在腐蚀产物膜层中出现局部富集, 远高于基体中的Cr含量. 高含Cr量使腐蚀产物膜中的Cr(OH)₃含量高, 并提高了腐蚀膜的保护性能, 从而引起腐蚀形态发生转变, 腐蚀速率降低. FeCO₃和Cr(OH)₃共沉积层膜对低铬钢的抗CO₂腐蚀性能具有关键的影响.

关键词 ：低铬X65钢, 腐蚀产物膜, 腐蚀速率, 腐蚀形态, CO₂腐蚀

Abstract：

The corrosion rates of X65 steels with different Cr contents were measured in CO₂ environment under high temperature and high pressure condition. ESEM, EDS, XPS and SEM were employed to analyze the morphologies and characteristics of corrosion scales on the steels. The results show that the corrosion rate significantly decreased with increasing Cr content in the steels. An increase in Cr content< leads to a lower susceptibility to local corrosion. When the Cr content reaches up to 3%, the local corrosion can be eliminated. The competitive deposition of FeCO₃ and Cr(OH)₃ on low-chromium steels results in a multilayer structure of the scales. The scales on 1Cr-X65 and 3Cr-X65 steels have three-layer structure and scale on 5Cr-X65 steel has two-layer structure. Cr exists mainly as amorphous compound Cr(OH)₃ in specific layer of the corrosion scales on low-chromium X65 steels. The Cr(OH)₃ content of the scale increases remarkably with increasing Cr content in the steels. The high Cr(OH)₃ content improves the protection performance of the scales and the corrosion resistance of low-chromium X65 steels. The rate of general corrosion and susceptibility to local corrosion are mainly dependent on the formation of codeposition layer of FeCO₃ with Cr(OH)₃ on low-chromium steels.

Key words： low-chromium X65 steel corrosion scale corrosion rate corrosion morphology CO₂ corrosion

收稿日期: 2008-07-10

ZTFLH:

TG172.9

基金资助:

国家自然科学基金资助项目50571014

作者简介: 孙建波, 男, 1975年生, 博士生

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