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金属的电化学腐蚀与防护是高中化学的重要内容,也是近年高考的热点.该部分主要涉及金属的电化学腐蚀与防护,合金防护,隔离空气、水等物质的防护,下面根据教材内容和考试大纲的要求,对从实验探究角度考查电化学腐蚀与防护进行分类解析.一、钢铁吸氧腐蚀和析氢腐蚀的实验探究钢铁表面的电解质溶液与里面的铁和碳构成原电池,铁是负极,碳是正极.中性或酸性环境下负极本身都被腐蚀生成亚铁离子,正极上分别吸收空气
Metal electrochemical corrosion and protection is an important part of high school chemistry, but also hot in recent years college entrance examination .This part mainly involves the electrochemical corrosion and protection of metals, alloy protection, isolation of air, water and other substances protection, following the textbook content and examinations Outline requirements, from the perspective of experimental investigation of electrochemical corrosion and protection classification analysis.A steel oxygen absorption and hydrogen evolution of the experimental study of the electrolyte solution on the surface of the steel and iron and carbon inside the original battery, iron is negative, Carbon is positive. Neutral or acidic environment, the anode itself is corroded ferrous ions, the positive electrode were absorbed air