316L不锈钢、690合金在氢氧化钠溶液中的电化学性能  

Electrochemical Properties of 316L Stainless Steel and 690 Alloy in NaOH Solution

作　　者：李成涛[1,2] 李晓刚[1,2] 程学群[1,2] 董超芳[1,2] 

机构地区：[1]北京科技大学新材料技术研究院,北京100083 [2]腐蚀与防护教育部重点实验室,北京100083

出　　处：《腐蚀与防护》2011年第4期252-255,271,共5页Corrosion & Protection

基　　金：国家自然科学基金(No.50871020);国家科技基础条件平台建设项目(No.2005DKA10400)资助

摘　　要：采用动电位极化、电化学阻抗和电容测量等方法研究了316L、690合金在NaOH溶液中的电化学行为及生成钝化膜的半导体性质。在NaOH溶液中,316L不锈钢存在明显的钝化区间;316L不锈钢、690合金在NaOH溶液中电化学阻抗谱的阻抗模值相近。动电位电化学阻抗谱(DEIS)表明,随扫描电位正移,钝化膜的阻抗在测试溶液中具有明显不同的变化,DEIS结果与动电位极化曲线形成对应。在0.1V电位形成钝化膜的Mott-Schottky曲线表明,316L不锈钢在NaOH溶液中的平带电位E_(FB)为0V,而690合金在NaOH溶液中的平带电位E_(FB)为-0.3V。690合金与316L不锈钢在NaOH溶液中表现出不同的成膜特性。The electrochemical behaviors of passive film formed on 316L stainless steel and 690 alloy in NaOH solution were studied by potentiodynamic polarization, electrochemical impedance spectroscopy （EIS） and capacitance measurements. The results showed that there were significant differences between polarization curves of the two materials in NaOH solution. 316L stainless steel had a wide passive anodic region from 100 mV to 900 mV in NaOH solution. The impedance value of the passive film on 316L stainless steel in NaOH solution was similar to that of 690 alloy. Potentiodynamic electrochemical impedance spectroscopy （DEIS） results demonstrated that with the increase of potential the variation trend of passive film was different. The results of the DEIS were in accordance with the potentiodynamic polarization curves. Mott-Schottky analysis showed that EFB of the passive film on 316L stainless steel in NaOH solution was 0 V, however EFB of the passive film on 690 alloy in NaOH solution was -0.3 V. The properties of the film formed on 690 alloy in NaOH solution were different from those on of 316L stainless steel.

关 键 词：316L不锈钢 690合金 电化学阻抗 Mott-Schottky曲线 平带电位(EFB) 

分 类 号：TG172.6[金属学及工艺—金属表面处理]