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 ,但对该现象是吸氧腐蚀、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。图 1　制取氧气装? After learning the knowledge of primary batteries, students can easily understand the principle of hydrogen evolution corrosion in electrochemical corrosion. Although it is known that iron and steel in the daily life is prone to rust in humid air, it is difficult to understand the phenomenon of oxygen corrosion and galvanic reaction. If the following demonstration experiment can be done, the cognitive process of students will be large. There are benefits. First, experimental device Experimental device shown in Figure 1, Figure 2. Figure 1 Preparation of oxygen equipment?