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SO2-₄对X100管线钢在盐渍性溶液中点蚀行为的影响
石志强¹,张秀云²,王彦芳¹,刘明星¹,唐康¹,　司爽爽¹,　李豪¹
(1.中国石油大学机电工程学院,山东青岛 266580;2.广西天然气管道有限责任公司,广西北海　536000)

摘要:

通过电化学测试技术研究X100管线钢在不同质量分数SO2-₄的盐渍性土壤模拟溶液中的点蚀行为,并利用扫描振动电极技术(SVET)分析其腐蚀机制,建立腐蚀模型。结果表明:试样在不同质量分数SO2-₄的土壤模拟溶液中均表现为典型的活性溶解;随着SO2-₄质量分数增加,极化电阻显著增加,自腐蚀电流密度降低,说明X100管线钢发生点蚀的倾向性减小,SO2-₄在库尔勒土壤中属于抑制性腐蚀阴离子。其腐蚀机制主要是SO2-₄与Cl-通过竞相吸附作用优先吸附在蚀坑表面,抑制Cl-对X100管线钢的腐蚀,同时生成的FeS腐蚀产物膜覆盖在腐蚀孔表面,降低了腐蚀速率。

关键词: X100管线钢盐渍性土壤模拟溶液 SO2-₄ Cl- 点蚀

DOI：10.3969/j.issn.1673-5005.2016.01.018

分类号::TG 172.4

基金项目:国家“863”计划项目(2012AA09A203);山东省自然科学基金项目(ZR2014EMM006);中央高校科研业务专项(11CX04032A)

Effects of SO2-₄ on pitting corrosion behavior of X100 pipeline steel in alkaline solution

SHI Zhiqiang¹, ZHANG Xiuyun², WANG Yanfang¹, LIU Mingxing¹, TANG Kang¹, SI Shuangshuang¹, LI Hao¹

(1.College of Mechanical ＆ Electronic Engineering in China University of Petroleum, Qingdao 266580, China;2.Guangxi Gas Pipeline Company Limited, Beihai 536000, China)

Abstract:

The pitting corrosion behaviors of X100 pipeline steel in simulative soil solutions with various mass fraction of SO2-₄ were investigated by electrochemical measurement. The synergistic effects of SO2-₄ and Cl-on the corrosion of X100 pipeline steel were analyzed by scanning vibrating electrode technique (SVET), and the corrosion mechanism models were established in this paper. The results show that X100 pipeline steel is characterized by a typical active dissolution, there is no obvious passive region in the simulated soil solution containing various mass fraction of SO2-₄ and Cl-. With the increase of SO2-₄ mass fraction , the polarization resistance increases significantly and the corrosion current density decreases, which indicates that X100 pipeline steel decreases the pitting corrosion tendency with the mass fraction of SO2-₄ increasing, and SO2-₄ plays a role of inhibitory corrosion anion in simulative soil solution. The corrosion mechanism is that SO2-₄ is adsorbed preferentially on the surface of the corrosion pits by competing adsorption with Cl-, the corrosion product FeS is formed simultaneously and then covers the surface of corrosion holes, thereby reduces the corrosion rate.

Key words: X100 pipeline steel alkaline solution SO2-₄ Cl- pitting corrosion