材料期刊网

滨海区地源热泵中材料耐腐蚀性研究是有效开展利用新能源的基础,具有重要意义.采用动电位极化扫描和电化学阻抗谱方法研究了不同植酸组装浓度和组装时间对316L不锈钢在地下咸水介质中耐蚀性的影响,并探讨了植酸与钼酸钠复配形成的自组装膜对316L不锈钢在地下咸水介质中耐蚀性的影响.结果表明:在Cl-质量浓度为10 g/L的NaCl溶液中,随着植酸浓度的增加,316L不锈钢自腐蚀电流密度呈先减小后增大的趋势,自组装膜对316L不锈钢的防护作用先增强后降低;随着自组装时间的延长,植酸自组装膜对316L不锈钢的缓蚀率先上升后下降.在自组装时间为6 h、植酸浓度为10 mmol/L时形成的自组装膜防护效果最好,缓蚀率达到84.17%.向植酸自组装液中添加钼酸钠后,形成的聚合钼酸根通过络合作用和静电作用使316L不锈钢的耐蚀性降低,说明植酸的复配对提高咸水介质中316L不锈钢的耐蚀性是有选择的.这为咸水地区地源热泵系统中316L不锈钢换热器的防护提供了理论指导.

Corrosion resistance of metal materials in ground source heat pump is the basis study for effective u-tilization of new energy sources in the coastal zone,and has important significance.The effects of phytic acid concen-trations,self-assembled times and the addition of sodium molybdate on the corrosion behaviour of 316L stainless steel were investigated by potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS).The ex-perimental results showed that with the increase of the self-assembled time and the phytic acid concentration,the pro-tective effect was dropped after a rise in the NaCl solution which contains 10 g/L Cl-.The protective effect gained a maximum of about 84.17% while the self-assembled time and the phytic acid concentration were 6 h and 10 mmol/L, respectively.After adding sodium molybdate in the self-assembled solution,the inhibition performance of phytic acid on 316L stainless steel showed antagonism effect due to the complexation and electrostatic effect of the polymeric mo-lybdate ions.It indicated that the combination of phytic acid with other inhibitor enhancing the corrosion resistance of 316L stainless steel was selective in salt water media.This research provides theoretical guidance for the protection of 316L stainless steel in the ground source heat pump.