Ase - Chromate Anodising

Chromate Anodising

CHEMICAL CONVERSION COATINGS FOR ALUMINIUM

YELLOW CHROMATE COATINGS (Alocrom 1200, Iridite 14-2)

Yellow chromate coating’s have excellent corrosion resistance for both painted and unpainted aluminium surfaces. The coating is flexible and will withstand bending and denting of the surfaces.It will give excellent paint adhesion to the aluminium surface. The coating has low electrical resistance, less than 5000 micro-ohms per square inch measured under an applied electrode pressure of 200 pounds per square inch.This process is preferable for high silicon pressure diecastings.

Yellow chromate coating’s are approved to DEF STAN 03-18/3 (including special approval for repairing damaged anodic coatings ) for use on aircraft to MIL-C-5541.

Yellow chromate coatings are NOT suitable for producing colour matching decorative coating’s.
This process should not be used to treat foodstuff containers.

BLUE TO GREEN CHROMATE COATINGS (Alocrom 100)

Blue to green chromate coatings have all the features of yellow coatings with the exception that it is not suitable for high silicon diecasting alloys. The coating can be left painted or unpainted as required, but accurate colour matching on unpainted alloy is not always possible.Can be used on food containers, spin drier's etc.

CLEAR CHROMATE COATINGS (Alocrom 1000)

A light chromate conversion coating to Aluminium and its alloys without significantly changing the appearance of the metal.

It is normally specified where corrosion resistance with a high level of electrical conductivity is required from the aluminium surface or the aluminium is to be subsequently lacquered and the surface must therefore be of a uniform metallic appearance.

APPLICATIONS OF CHROMATE COATINGS

Aircraft
Atomic
Automotive
Electronic
Electrical
Telecommunications industries
and for use as a base to bonding and for the application of organic materials particularly paints and lacquers.