酸性环境下Zn-Mg合金电化学腐蚀实验研究

EXPERIMENTAL RESEARCH ON ELECTROCHEMICAL CORROSION OF Zn-Mg ALLOY UNDER ACID ENVIRONMENT

目的:在酸性环境下,研究关于Zn-Mg合金发生电化学腐蚀的现象。方法:在恒温25℃温度下,取5.5gZn-Mg合金粉末,加入酸液后轻轻振荡。选取0.1~2mol/L盐酸溶液,设定不同体积,探究盐酸溶液体积不同对反应的影响。结果:Zn-Mg合金粉末浸泡在酸碱度在pH=6.8的盐酸溶液中,24小时后Zn-Mg合金的表面被腐蚀程度已经趋于稳定状态。结论:当Zn-Mg合金表面形成一个钝化膜之后,盐酸对Zn-Mg合金粉末的腐蚀就会受到阻碍,钝化膜保护着Zn-Mg合金,降低酸性环境对Zn-Mg合金的继续腐蚀。本文意图为中学化学教师和化学专业学生提供可借鉴的实验方案,从而使教师在进行Zn-Mg合金的教学时能成功实施此实验,也为化学专业学生在进行Zn-Mg合金实验时能得到有效数据。

To study the electrochemical corrosion of Zn-Mg alloy in acidic environment.Methods:5.5G Zn-Mg alloy powders were taken at constant temperature of 25℃ and added with acid solution,then gently oscillated.Choose 0.1-2 mol/L hydrochloric acid solution,set different volume,explore the effect of different volume of hydrochloric acid solution on the reaction.Results:Zn-Mg alloy powder was immersed in hydrochloric acid solution with pH=6.8.After 24 hours,the corrosion degree on the surface of Zn-Mg alloy tended to be stable.CONCLUSION:When a passivation film is formed on the surface of Zn-Mg alloy,the corrosion of Zn-Mg alloy powder will be hindered by hydrochloric acid.The passivation film protects the Zn-Mg alloy and reduces the corrosion of Zn-Mg alloy in acidic environment.The purpose of this paper is to provide a referential experimental scheme for middle school chemistry teachers and students majoring in chemistry,so that teachers can successfully carry out this experiment in the teaching of Zn-Mg alloys,and also provide effective data for students majoring in chemistry in the experiment of Zn-Mg alloys.