Chromate Conversion Coating

Chem Film, also widely referred by the brand names Alodine or Iridite, is the application of a chromate conversion coating on aluminum alloys. Conversion coatings produce a finish which:

• Protects the surface from corrosion
• Provides a surface for better adhesion of primers, paints and powder coat
• Conducts electricity
• Extends shelf-life of parts while resisting staining and fingerprinting
• Can be used for touch up of scrapes or bare spots from various causes

Classes

There are two classes of coating as specified in MIL-DTL-81706B and MIL-DTL-5541F.

Class 1A	For maximum protection against corrosion, painted or unpainted.
Class 3	For protection against corrosion where low electrical resistance is required.

Types

There are two types of coating as specified in MIL-DTL-81706B and MIL-DTL-5541F.

Type I	Compositions with hexavalent chromium.
Type II	Compositions with no hexavalent chromium.

Aluminum Chromates

Aurous 19

A powdered chemical used to form a protective conversion coating on aluminum surfaces.

QPL approved
Mil-DTL-81706B, Type I, Class 1A, Form II, Method C
Mil-DTL-81706B, Type I, Class 3, Form II, Method C
Mil-C-5541


650 ChromitAL TCP

A liquid chemical used to form a protective conversion coating on aluminum surfaces without the use of hexavalent chromium.

RoHS compliant
QPL approved
Mil-DTL-81706B, Type II, Class 1A, Form I, Method C
Mil-DTL-81706B, Type II, Class 3, Form I, Method C
Mil-C-5541