X80钢及其焊缝在鹰潭土壤模拟溶液中的循环伏安行为  

The Cyclic Voltammogram Behaviors of Welded X80 Pipeline in Yingtan Simulated Soil Solution

作　　者：陈旭[1] 吴明[1] 何川[1] 王成详[1] 

机构地区：[1]辽宁石油化工大学石油与天然气学院,辽宁抚顺113001

出　　处：《石油化工高等学校学报》2010年第3期62-67,共6页Journal of Petrochemical Universities

基　　金：国家自然科学基金资助项目(50771053)

摘　　要：用循环伏安法研究了X80钢及其焊缝在鹰潭土壤模拟溶液中,溶液/电极界面上的电化学腐蚀反应。通过改变扫描速率、阳极电位上限、离子浓度、通气状态研究了钢的阳极极化和阴极析氢反应之间的相互作用。结果表明,酸性环境中的X80钢电化学行为是不可逆的电荷转移过程,钢的表面不能形成一个稳定的氧化膜。溶液中的侵蚀性离子使阳极极化和阴极析氢反应程度增加。阳极极化产生的稳定沉淀层对析氢反应起催化作用。氧气的存在能使钢表面能生成稳定的氧化膜,这会降低对析氢反应的催化作用。溶液中的CO2能增加焊缝的SCC敏感性。Cyclic voltammetry was used to comprehensively investigate the fundamentals of the electrochemical corrosion reactions occurring at the steel/solution interface in Yingtan soil simulated solution. The interrelation between anode polarization and the cathodic hydrogen evolution was studied by changing the sweep rate, the upper potential limit,ions concentration and gas conditions. The results show that the electronically behaviors of X80 steel are irreversible charge transfer process. There is no stable oxide film formed on the steel surface. The anode polarization and cathodic hydrogen evolution reaction are enhanced by the corrosive ions in the solution. The hydrogen evolution was catalyzed by the stable deposition film which generated during the anode polarizing. The introduction of oxygen could form a stable oxide film, which weakened the catalysis to the hydrogen evolution. The stress corrosion cracking sensitivity of the welded metal is increased by CO2 introduced to the solution.

关 键 词：X80钢 焊缝 循环伏安 腐蚀 

分 类 号：TG172.4[金属学及工艺—金属表面处理]