1、观察济南铝板http://www.jngdly.com/颜色，已生成氧化膜的纯铝板表面是乳白色，铸铝，杂铝呈灰黑色。未生成氧化膜的表面呈透明的亮白色，有的还附有粉红或灰黑色的挂霜。
Jinan observed aluminum color, has generated pure aluminum oxide film surface is white, cast aluminum, aluminum miscellaneous grayish black. Did not generate a transparent oxide film surface was bright white, some gray with pink or black frost.
　　
2、测量济南铝板电阻，已生成氧化膜的检测时有电阻，常压下不导电，未生成氧化膜的检测时能导电。
Jinan aluminum measuring resistance, the generated oxide film has resistance detected when non-conductive under normal pressure, can be detected when the conductive oxide film is not generated.
　　
3、划痕，已生成氧化膜的济南铝板表面很硬，用针划时打滑，无划痕，未生成氧化膜的表面很软，用针划时有阻力和划痕。
Scratches, Jinan generated aluminum oxide film surface is very hard, when you draw with a needle slipping, no scratches, no surface oxide film is very soft, there is resistance and scratches with a needle scratch.
　　
4、听声，已生成氧化膜的济南铝板敲打时会发出清脆声，未生成氧化膜的敲打时发出闷声。
Listen to the sound, it will issue a crisp sound generated when the aluminum oxide film Jinan beat, beat of the oxide film at issue did not generate muffled.
　　
5、对济南铝板http://www.jngdly.com/进行着色检验，已生成氧化膜的在染色溶液中很快可以上色，未生成氧化膜的在染料溶液中染不上色。
Jinan colored aluminum plate test, the generated oxide film may be colored in a dye solution quickly, the oxide film is not generated in the dye solution, dye not color.