摘要
为了明确氢氟酸(HF)溶液中的氧对双相不锈钢(DSS)腐蚀性能的影响,通过动电位极化、电化学阻抗、Mott-Schottky曲线等电化学方法以及浸泡试验,研究了2205DSS在不同溶解氧(DO)含量的氢氟酸溶液中的腐蚀行为,采用金相显微镜观察了腐蚀后的表面形貌。结果表明:随着HF溶液中DO含量从7.8 mg/L下降到1.7mg/L,2205DSS的开路电位逐渐变负,自腐蚀电流密度和维钝电流密度区间逐渐增大,钝化电位区间逐渐减小,钝化膜电阻和电荷转移电阻逐渐变小;随着DO含量的降低,2205DSS表面腐蚀凹坑数量逐渐增多,腐蚀越发严重,这主要是因为氧含量的大小影响了2205DSS表面钝化膜的形成速度和钝化膜的缺陷数量。
In order to understand the effect of dissolved oxygen （DO） in hydrofluoric acid （HF） solution on the corrosion resistance of duplex stainless steel （DSS） , the corrosion behavior of 2205DSS in HF solution with different DO contents was studied by potentiodynamie polarization curves, electrochemical impedance spectroscopy, Mott-Schottky curves and immersion test, and the morphology after corrosion was observed by metallographie microscope. Results showed that with the decrease of DO from 7.8 mg/L to 1.7 mg/L, the open circuit potential of 2205DSS became more negative, and the corrosion current density and passive current density region increased, as well as the passive region decreased. Meanwhile, the passive film resistance and charge transfer resistance also decreased. The observation of immersion sample presented that with the decrease of DO content, the number of corrosion pits on the surface of 2205DSS increased gradually, and the corrosion became more serious, which was mainly due to the influence of oxygen content on the formation rate and surface quality of the passive film on 2205DSS surface.
作者
逄旭光
张云霞
迟嘉鹏
史艳华
梁平
PANG Xu-guang1, ZHANG Yun-xia2, CHI Jia- peng3, SHI Yan-hua1, LIANG Ping1(1. School of Mechanical Engineering, 2. School of Extended Education, Liaoning Shihua University, Fushun 113001, China; 2. PetroChina Fushun Petrochemical Company, Fushun 113007, Chin)
出处
《材料保护》
CAS
CSCD
北大核心
2018年第4期12-15,46,共5页
Materials Protection
基金
辽宁省教育厅科学研究项目(L2012127)资助
关键词
2205双相不锈钢
溶解氧
氢氟酸
钝化膜
耐蚀性
2205 duplex stainless steel
dissolved oxygen
hydrofluoric acid
passive film
corrosion resistance
