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学习原电池知识后,学生对电化腐蚀中的析氢腐蚀原理容易理解。对日常生活中钢铁在潮湿空气中容易生锈虽有所了解,但对该现象吸氧腐蚀,发生了原电池反应却难以理解,若能做以下演示实验,对学生的认知过程会大有益处。一、实验装置实验装置见图1,图2。A,B都是用八号铁丝折成W状再锤打成的铁片。
After learning the original battery knowledge, students can easily understand the principle of hydrogen evolution in electrochemical corrosion. Steel in the daily life in the humid air is easy to rust Although we understand the phenomenon of oxygen corrosion, the original battery reaction is difficult to understand, if we can do the following demonstration experiments, the cognitive process of students will be great benefit. First, the experimental device Experimental device shown in Figure 1, Figure 2. A, B are used on the 8th wire folded into W-shaped and then hammer into pieces.