不同浓度NaCl、NaS·9H_2O溶液对316L不锈钢电化学性能影响  

Effects of Different Concentrations of NaCl,NaS·9H_2O Solution on the Electrochemical Performance of 316L

作　　者：马云霖[1] 

机构地区：[1]甘肃蓝科石化高新装备股份有限公司,甘肃兰州730070

出　　处：《石油化工设备》2014年第2期5-10,共6页Petro-Chemical Equipment

摘　　要：采用动电位极化、交流阻抗和电容测量等方法,研究了316L不锈钢在不同浓度的NaCl、NaS·9H2O溶液中的电化学行为以及生成钝化膜的半导体性质。试验研究结果表明:①随着NaCl浓度的增加,316L不锈钢点蚀电位及点蚀孔内溶液电阻下降很快,耐点蚀能力下降。随着NaCl浓度增加,316L不锈钢生成半导体钝化膜困难,钝化膜结构由n、p型转化为p型,钝化膜杂质含量增加,耐点蚀能力下降。②随着NaS·9H2O浓度的增加,316L不锈钢点蚀电位以及点蚀孔内溶液电阻下降很快,耐点蚀能力下降。在不同浓度的NaS·9H2O溶液中,316L不锈钢生成的半导体钝化膜均为n、p型,钝化膜杂质含量随着NaS·9H2O浓度的增加而增加,耐点蚀能力下降。Using potentiodynamic polarization, AC impedance and capacitance measurement methods to study the electrochemical behavior and generate passive film semiconductor properties of 316L stainless steel in different concentrations of NaCI, NaS · 9H20 solution. The results show that： as the increasing of NaC1 concentration, stainless steel pitting, potential and pitting solution resistance decreased rapidly, pitting resistance decreased. It is difficult for 316L stainless steel to generate semiconductor passivation film with the increasing of NaC1 concentration , the structure of passivation film converted from model n, model p into model p, the impurities of the passivation film increased, and the resistance to pitting corrosion decreased With the increasing of NaS · 9H20 concentration, 316L stainless steel pitting potential and pitting hole solution re- sistance decreased rapidly, pitting resistance decreased;in different concentrations of NaS · 9H20 solution, 316L stainless steel passivation film generated semiconductor model n and model p, the passivation film impurity increased as the increasing of NaS · 9H20 concentration, resistance to pitting corrosion decreased.

关 键 词：316L不锈钢 NACL溶液 NaS·9H2O溶液 电化学性能 钝化膜 点蚀 

分 类 号：TQ050.9[化学工程] TG172.6[金属学及工艺—金属表面处理]