Before the experiment, sandpaper sh

实验前，应使用砂纸打磨钢板。请注意，砂纸的目数应从低到高。研磨后，用蒸馏水洗涤。洗涤后，脱脂，最后干燥24小时再称重。<br>在实验过程中，将准备好的500 ml 3％NaCl水溶液放入500 ml宽口瓶中，连接CO2钢瓶，将CO2引入瓶中的溶液中直至其饱和（pH≈4.6），停止通风并密封。

Before the experiment, sandpaper should be used to polish the steel sheet. Note that the mesh number of sandpaper should be from low to high. After grinding, wash with distilled water. After washing, degrease, and finally dry for 24 hours before weighing.<br>During the experiment, put the prepared 500 ml 3% NaCl aqueous solution into a 500 ml wide mouth bottle, connect the CO2 steel cylinder, introduce CO2 into the solution in the bottle until it is saturated (pH ≈ 4.6), stop ventilation and seal.

实验前，用砂纸打磨钢板。注意砂纸的网目数应该从低到高。研磨后，用蒸馏水清洗。清洗后，脱脂，最后干燥24小时后称重。<br>实验过程中，将配制好的500ml 3%NaCl水溶液放入500ml宽口瓶中，连接CO2钢瓶，将CO2注入瓶中溶液至饱和（pH≈4.6），停止通风密封。<br>