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用恒电位浸蚀方法在高压釜中研究了供货态316 L钢在尿素介质中发生非敏化态晶间腐蚀与电位区段的关系,并在常温硫酸溶液中研究了316 L钢非敏化态晶间腐蚀的发展过程及其与电位值的关系。结果表明,固溶态316 L钢在活化或活化—钝化过渡电位区仅产生全面腐蚀。而在过钝化电位区,既产生全面腐蚀,也产生晶间腐蚀。在过钝化电位区进行恒电位浸蚀时,在等电量条件下,随着浸蚀电位值升高,晶间腐蚀所占比例逐渐减小;在非等电量条件下,随浸蚀时间推移(即随浸蚀电量增加),晶间腐蚀深度和宽度都增加,腐蚀断面形态呈“V”字形。使用高纯不锈钢可以减轻非敏化态晶间腐蚀。
The relationship between the non-sensitized intergranular corrosion and the potential zone in 316L steel supplied by 316L steel in urea solution was studied by potentiostatic etching in autoclave. Development of Intergranular Intergranular Corrosion and Its Relationship with Potential. The results show that the solid solution 316L steel in the activation or activation - passivation transition potential region only produce full corrosion. In the passivation potential area, both to produce a comprehensive corrosion, but also produce intergranular corrosion. Under the condition of constant potential etching in the passivation potential region, the proportion of intergranular corrosion gradually decreases with the increase of the etching potential under the condition of the same power. Under the condition of non-equal power, with the erosion time (That is, as the etching power increases), intergranular corrosion depth and width are increased, the corrosion cross-section was “V” shape. Use of high purity stainless steel can reduce non-sensitized intergranular corrosion.