Aluminium Anodizing

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CHOOSE THE ALUMINIUM SUITABLE FOR YOUR INDUSTRY.

The impurities in the aluminium affect the anodizing quality tremendously.

Low grade Casting aluminium will need special care in anodizing.

The higher the aluminium purity the shining and effects on it are better.

HOW TO DO NORMAL ANODIZING

STEPS TO BE DONE PRIOR TO ANODIZING

Prepare the Aluminium.

A.Clean the dirty Raw Material with a pre-cleaner.
B.Buff the material to make it smooth and shining.
C.Clean the buffing compounds.
D.Dip the aluminium in a caustic solution for 15 seconds(Just to break the bauxite film and to expose the pure aluminium to the surface).
E. Rinse with water.

DECIDE THE FINISH TO BE GIVEN

STEPS TO BE DONE PRIOR TO ANODIZING
A.Glossy = Bright
B.Matt = Dull or Bright
C.Satin = Dull or Bright
D.Velvet = Dull or Bright

Rinsing in water is required.

Anodizing

Prepare the anodizing bath

De-mineralized water is recommended

90% of problems are related to water impurities.

Sulphuric acid is most commonly used but other electrolytes are also possible.

Normal anodizing temp is done at

18 to 20 degrees centigrade

Can be done at lower temp.also depending on the hardness required.

Fume suppressors are beneficial for use.

Air ventilation is not sufficient alone.

Duration of anodizing

Half time : 20-30 minute for light shades (Gold,Yellows,Light Green,Light Blue)

Full time : 45-50 minutes for dark deep (Rubines,Browns,Navy Blue, Black)

Direct current rectifier used

Current Density

15 amp /sq.meter

Potential Difference : 10-20 Volts D.C.

Different methods are used to get different finishes

The anodizing tank needs to renewed after 3 months as the impurities increase.

Pointers to remember

Check the pH required of the anodizing and colouring bath

Check the quality of the water used.

Keep a check of the aluminum contacts used.

There should be NO oxide or anodizing or colour left on the contacts as it will not pass current.

Check the anodic film with a non destructive meter.

The anodic film should at least have 7 microns for light and 20 for deep dark shades.

Aluminium Anodizing

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Aluminium Anodizing

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