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利用模拟闭塞电池研究Cr18Ni9Ti奥氏体不锈钢在NaCl溶液中,闭塞区内化学和电化学状态的变化。当电流通过闭塞区时,溶液pH值随时间下降,电流密度愈大,下降也愈大,可达负值,电极所通过的电量与溶液pH成函数关系。Cl~-在闭塞区内的浓集倍数与时间成直线关系,最高测到浓集达9—10倍。在一定电流密度下,与单位阳极面积相应的Cl~-迁入量与时间成正比。若以电流密度对单位时间、单位阳极面积相应的Cl~-迁入量作图或以电流强度对每小时Cl~-迁入量作图,均得直线关系。
Simulated occluded cells were used to study the chemical and electrochemical changes of Cr18Ni9Ti austenitic stainless steel in NaCl solution. When the current through the occlusion zone, the pH value of the solution decreases with time, the greater the current density, the greater the decline, up to negative, the electrode through the power and pH as a function of the solution. Cl ~ - concentration in the occlusion zone concentration times a linear relationship with the time, the highest measured concentrations of up to 9-10 times. At certain current density, the amount of Cl ~ - corresponding to the unit anode area is proportional to the time. If the current density of the unit of time, the unit anode area corresponding Cl ~ - migration amount plot or current intensity on the amount of Cl ~ - migration into the plot, have a straight line.