CHROMATING also known as Iridite or Alodine (brand names) is a thin chemical finish on aluminum that provides increased corrosion resistance and improved bonding ability while remaining electrically conductive.
Technodic, Inc. provides the following chromate and specifications:
Clear Chromate (RoHS compliant) –
MIL - C - 5541 Type I, Class 1A
MIL - DTL - 5541
ASTM B449
AMS - 2473
MIL - STD - 171 Finish No. 7.3.1
Yellow Chromate –
MIL - C - 5541 Type I, Class 1A
MIL - DTL - 5541
ASTM B449
AMS - 2473
MIL - STD - 171 Finish No. 7.3.2
Chromate (Least Electricity Resistant)–
MIL - C - 5541, Class 3
MIL - DTL - 5541
ASTM B449 Class 3
AMS - 2474
MIL - STD - 171 Finish No. 7.3.3
MIL - F - 14072 Finish No. E512
*Capacity to 48"