Simple test anodic oxide film 5 Ways

The quality of the oxide film can be detected by the following method ;

1 View of colors. Generated surface oxide film is a milky white Aluminum Alloys , cast aluminum , miscellaneous aluminum grayish black . Did not generate the surface oxide film was transparent bright white , some black or gray with pink hanging cream.

2 The measured resistance . Generated when the detection of the oxide film resistor , pressure not conductive. The oxide film is not generated when a detection conductor .

3 scratches the surface of the oxide film has generated very hard, when you draw with a needle slipping, no scratches, the surface of the oxide film is not generated very soft, with a needle and scratch resistance when planning .

4 Listen to the sound of banging oxide film has been generated will be issued when the crisp sound, the oxide film is not generated when issuing muffled beat

5 coloration test. Oxide film has been generated in the dye solution soon be colored oxide film is not generated in the dye solution dyed not color