Detection device and method of anodic oxide film

Abstract

A device for detecting an anodic oxide film during an anodic oxidation treatment includes a container receiving an electrolyte therein, an aluminum sheet immersed in the electrolyte, a power source supplying a current to the aluminum sheet to form an anodic oxide film on the aluminum sheet, a data acquisition unit measuring a potential of the anodic oxide film at a time, a data processor unit calculating a differential value of the potential, and a display unit displaying a differential curve generated according to the differential values of the potentials at different times. The quality of the anodic oxide film can be judged by reading the shape of the differential curve.

1 . A method for detecting an anodic oxide film during an anodic oxidation treatment, comprising steps of:
 acquiring potentials of the anodic oxide film at different anodizing times by a data acquisition unit;   calculating differential values of the potentials at the different anodizing times by a data processor unit;   generating a differential curve according to the differential values of the potentials and displaying the differential curve on the display unit; and   judging a pore formation capability of the anodic oxide film according to a shape of the differential curve.   
   
   
       2 . The method of  claim 1 , further comprising generating a potential-time curve according to the potentials of the anodic oxide film at the different anodizing times, and displaying the potential-time curve associated with the differential curve on the display unit. 
   
   
       3 . The method of  claim 2 , wherein during a period of the anodizing times from a time when a corresponding potential of the anodic oxide film reaches a maximum to a time when a corresponding potential of the anodic oxide film starts to become constant, if only one valley is formed on the differential curve, the anodic oxide film is excellent, and if more than one valleys are formed on the differential curve, the anodic oxide film is bad. 
   
   
       4 . A device for detecting an anodic oxide film during an anodic oxidation treatment, comprising:
 a container receiving an electrolyte therein;   an aluminum article extending into the electrolyte;   a power source electrically connected to the aluminum article for supplying a current to the aluminum article to cause an anodic oxide film to grow on the aluminum article;   a data acquisition unit measuring potentials of the anodic oxide film at different times;   a data processor unit calculating differential values of the potentials at the different times; and   a display unit displaying a differential curve generated according to the differential vales of the potentials.   
   
   
       5 . The device of  claim 4 , wherein the container is received in a constant temperature device for maintaining a constant anodizing temperature during the anodic oxidation treatment. 
   
   
       6 . The device of  claim 4 , wherein the power source can be adjusted to change a current density through the aluminum article. 
   
   
       7 . The device of  claim 4 , wherein the aluminum article is connected to a positive pole of the power source, the device further comprising another aluminum article connected to a negative pole of the power source, and a calomel electrode function as a reference electrode. 
   
   
       8 . The device of  claim 7 , wherein the calomel electrode has one end extending into the electrolyte, and another end connected to a reference terminal of the data acquisition unit, an input terminal of the data acquisition unit being connected to the aluminum article, and an output terminal being connected to the data processor unit. 
   
   
       9 . The device of  claim 7 , wherein the data processor unit generates a potential-time curve according to the potentials of the anodic oxide film at the different times, and the display unit displays the potential-time curve associated with the differential curve. 
   
   
       10 . The device of  claim 4 , wherein the electrolyte is a solution including one of sulfuric acid, phosphoric acid, chromic acid, and organic acid.