H<sub>2</sub>S浓度和pH值对X65海管钢焊接接头腐蚀行为的影响

doi:10.11902/1005.4537.2013.124

中国腐蚀与防护学报

2014, Vol. 34

Issue (3): 231-236 DOI: 10.11902/1005.4537.2013.124

本期目录 | 过刊浏览

H₂S浓度和pH值对X65海管钢焊接接头腐蚀行为的影响

邢云颖, 刘智勇, 杜翠薇(

), 李晓刚, 刘然克, 朱敏

北京科技大学腐蚀与防护中心教育部腐蚀与防护重点实验室北京 100083

Influence of H₂S Concentration and pH Value on Corrosion Behavior of Weld Joint of X65 Subsea Pipeline Steel

XING Yunying, LIU Zhiyong, DU Cuiwei(

), LI Xiaogang, LIU Ranke, ZHU Min

Key Laboratory of Corrosion and Protection of Ministry of Education, Corrosion and Protection Center University of Science and Technology Beijing, Beijing 100083, China

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摘要:

采用高压釜模拟海底集输环境,通过电化学测试技术、浸泡实验、SEM和XRD技术研究了H₂S浓度和pH值对X65钢焊接接头腐蚀行为的影响。结果表明,X65钢焊接接头中热影响区的开路电位最负,焊缝最正,母材介于两者之间,腐蚀电流密度从大到小的顺序为：热影响区>母材>焊缝；焊接接头平均腐蚀速率在0.1~0.25 mm/a之间,硫化物浓度增加、pH值降低均可导致腐蚀速率增加；X65钢海管焊接接头在模拟现场工况条件下以均匀腐蚀为主,焊缝区腐蚀程度低于热影响区。

关键词 ： X65钢, 焊接接头, 海底, 腐蚀, H₂S浓度, pH值

Abstract：

With an autoclave the environment of submarine gathering system was simulated, then in which the influence of concentration of H₂S and pH value on the corrosion behavior of weld joints of X65 pipeline steel was investigated by electrochemical techniques, immersion test, SEM and XRD analysis technique. The results show that the free corrosion potential of different portion of the X65 pipeline steel weld joint exhibited a tendency of decrease, but the corrosion density of increase, corresponding to the following order as: the weld seam, the heat affected zone and the base material. The average corrosion rate of the steel weld joints is in the range of 0.1~0.25 mm/a, the increase of the concentration of H₂S and the reduction of the pH value can both lead to the increase of corrosion rate. The corrosion mode of weld seam of X65 steel is mainly the uniform corrosion in the simulated environment, and the corrosion of weld seam is slighter than that of the heat affected zone.

Key words： X65 steel weld joint submarine corrosion H₂S concentration pH value

收稿日期: 2013-08-07

ZTFLH:

TG172.5

基金资助:国家科技支撑计划项目 (2011BAK06B01-01-02)资助

作者简介: null

邢云颖，女，1988年生，硕士生，研究方向为材料的腐蚀与防护

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引用本文:

邢云颖, 刘智勇, 杜翠薇, 李晓刚, 刘然克, 朱敏. H₂S浓度和pH值对X65海管钢焊接接头腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2014, 34(3): 231-236.
Yunying XING, Zhiyong LIU, Cuiwei DU, Xiaogang LI, Ranke LIU, Min ZHU. Influence of H₂S Concentration and pH Value on Corrosion Behavior of Weld Joint of X65 Subsea Pipeline Steel. Journal of Chinese Society for Corrosion and protection, 2014, 34(3): 231-236.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2013.124 或 https://www.jcscp.org/CN/Y2014/V34/I3/231

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