摘要
氢氟酸用作烷基化油生产的催化剂时,对烷基化装置中常用的Q235钢具有很强的腐蚀性,2205双相不锈钢有望作为替代品,但目前对氢氟酸介质中2205双相不锈钢腐蚀行为的研究不多。通过浸泡试验,考察了2205双相不锈钢和Q235钢在5%HF溶液中的平均腐蚀速度,借助扫描电镜(SEM)观察了2种材料腐蚀后的表面形貌,通过动电位极化和电化学阻抗方法分析了其腐蚀机理。结果表明:Q235钢在5%HF溶液中阳极过程表现为活性溶解,而2205双相不锈钢在该介质中则出现了较宽的钝化区间和较低的维钝电流密度;2205钢的电荷转移电阻约是Q235钢的183倍,2205钢具有良好的抗氢氟酸腐蚀性能,这与其表面形成的钝化膜有关。
Average corrosion rate of 2205 duplex stainless steel and Q235 steel in 5%HF solution was studied by immersion test,and the scanning electron microscope was employed to observe the surface morphology of materials after corrosion test.The corrosion mechanism was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy.Results showed that Q235 steel in 5%HF solution behaved active dissolution,while 2205 duplex stainless steel in this corrosion medium performed a wide passive region and a low passive current density.Furthermore,the free corrosion current density of Q235 steel was almost 183 times to that of 2205 duplex stainless steel,which indicated that 2205 steel possessed excellent corrosion resistance in HF solution,due to the formation of passivation film on its surface.
出处
《材料保护》
CAS
CSCD
北大核心
2016年第11期18-20,共3页
Materials Protection
基金
辽宁省教育厅2012年科学研究一般项目(L2012127)
2013年度辽宁省普通本科高等学校实验教学示范中心建设项目资助
关键词
氢氟酸
2205双相不锈钢
Q235钢
耐蚀性
hydrofluoric acid
2205 duplex stainless steel
Q235 steel
corrosion resistance
