摘要
通过推导恒电位-恒电流(P-G)瞬态响应测试过程中吸附、脱附电流的动力学表达式,得到了有吸附的钝化体系的P-G响应曲线的数学模型。由自行研制的SHFF型电化学瞬态响应测试仪,采用电位台阶和恒电位连续P-G测试技术研究了吸附型缓蚀剂哌啶和癸胺对AISI304SS在0.5mol/L NaCl溶液中孔蚀的抑制作用。实验结果证实了所建立的模型能很好地反映有吸附的钝化体系的P-G响应特征。结合表面形貌照片,分析了缓蚀剂对孔蚀发生和发展的不同阶段的抑制作用。研究结果表明:癸胺和哌啶能阻滞孔蚀的发生,对孔蚀的发展也有一定的抑制作用。
In this paper,a kinetic expression of the adsorption-desorption current in Potentiostatic-Galvanostatic (P-G)measurement was deduced. Further,a mathematical model was set up for the P-G response curve of the passive system in the presence of adsorption. Using self-made Model SHFF electrochemical transient response instrument,the effect of the adsorption inhibitors,piperidine and n-de-cylamine,on the pitting corrosion of AISI 304SS in 0. 5mol/L NaCl solution was studied. Combined with the surface morphology ,the possible mechanism for the inhibition effect on the different stages of pitting process was discussed. The results proved that the new model can illustrate well the P-G response characteristics of the passive systems with adsorption. Piperidine and decylamine not onlyblock strongly the pitting initiation, but also retard the pitting propagation to some extent.
出处
《中国腐蚀与防护学报》
CAS
CSCD
1993年第2期117-125,共9页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金
中科院腐蚀科学开放研究实验室资助项目
