摘要
滨海地区地下咸水对地源热泵换热系统中不锈钢材料的腐蚀十分严重。采用动电位极化扫描和电化学阻抗谱等方法研究了模拟咸水中不同阴离子协同作用下316L不锈钢的腐蚀行为。结果表明:随着Cl-浓度的增加,316L不锈钢耐蚀性降低。SO42-与Cl-协同作用时,高浓度的SO42-抑制了Cl-对316L不锈钢表面膜的破坏,增强其耐蚀性,低浓度的SO42-则降低其耐蚀性;而HCO3-与Cl-的协同作用对316L不锈钢耐蚀性影响的规律与之相反。当这3种阴离子共存时,其协同作用加速了316L不锈钢的腐蚀。这为不同地下水环境条件下地源热泵系统的选材提供了参考。
Saline groundwater in coastal area causes serious corrosion of stainless steel materials in heat exchanger system of ground source heat pump. The electrochemical features of 316L stainless steel under the combined effect of different anions were studied by potentiodynamic polarization curves and electrochemical impedance spectroscopy （EIS）. The results showed that corrosion resistance of 316L stainless steel decreased with the increasing of Cl^- concentration. When SO4^2- and Cl^- coexisted in saline groundwater, the high concentration of SO4^2- inhibited the damage to 316L stainless steel induced by Cl^-, thus improved the corrosion resistance of 316L stainless steel, while the low concentration of SO4^2- increased the damage to 316L stainless steel. The rule of combined effect of Cl^- and HCO3- was opposite to that of Cl^- and SO4^2-. When the three anions coexisted in saline groundwater, their combined effect accelerated the corrosion of 316L stainless steel. These results can provide a guide for material selection in different groundwater environmental conditions.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2015年第4期107-111,共5页
Materials Reports
基金
国家科技支撑计划(2013BAJ09B04)
关键词
地下咸水
阴离子协同作用
316L不锈钢
点蚀
saline groundwater, combined effect of anions, 316L stainless steel, pitting corrosion
