电化学工作站在金属腐蚀实验教学中的应用

发布时间：2018-05-04 03:13

本文选题：电化学工作站 + 腐蚀速率　；参考：《山东化工》2014年09期

【摘要】：传统金属腐蚀实验中,采用失重法来计算材料平均腐蚀速度,难以评价特定介质中材料的真实腐蚀速度与耐腐蚀能力,学生对腐蚀的规律缺乏科学认知。将电化学工作站引入金属腐蚀实验教学中,使得学生掌握如何利用电化学工作站来精确研究金属的腐蚀速度与耐腐蚀能力,可克服上述弊病。采用三电极体系,研究材料制备成工作电极,铂电极为对电极,Ag/AgCl电极为参比电极,放入待测介质中,测量开路电位E-t曲线,获得腐蚀电位;然后在腐蚀电位下测定塔菲尔图,获得腐蚀电流密度;最后测定交流阻抗谱,获得低频率区实部值。比较与分析腐蚀电位、腐蚀电流密度与低频率区实部值,可以科学客观的评价材料耐腐蚀能力。既提高了实验效果,也提高了学生的学习兴趣。
[Abstract]:In the traditional metal corrosion experiment, the weightlessness method is used to calculate the average corrosion rate of materials. It is difficult to evaluate the true corrosion rate and corrosion resistance of the materials in a specific medium, and the students lack scientific understanding of the corrosion law. By introducing the electrochemical workstation into the experimental teaching of metal corrosion, students can master how to use the electrochemical workstation to accurately study the corrosion rate and corrosion resistance of metals, which can overcome the above disadvantages. The working electrode was prepared by using three-electrode system, and the platinum electrode was used as the reference electrode of Ag / AgCl electrode, and the open circuit potential E-t curve was measured in the medium to be tested, and then the Tafel diagram was determined under the corrosion potential. The corrosion current density was obtained, and the AC impedance spectrum was determined to obtain the real value in the low frequency region. The corrosion resistance of materials can be evaluated scientifically and objectively by comparing and analyzing corrosion potential, corrosion current density and real value of low frequency region. Not only improve the experimental effect, but also improve the students' interest in learning.
【作者单位】：南京工程学院环境工程学院;
【基金】：江苏省省环保厅科研课题项目(2013023) 江苏省工业节水减排重点实验室开放基金重点项目(IWCER201202)
【分类号】：G642;TG171-4

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