ASTM B Standard Specification for Chromates on Aluminum. Advanced Plating Technologies, a Milwaukee company, offers Aluminum Chromate Conversion Coatings per MIL-C (MIL-DTL) and ASTM B CHEMICAL FILMS ASTM-B/MIL-C CLASS 1A. Materials qualified produce coatings that range in color from clear to iridescent yellow or brown.
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Chromate Classes Class 1- Yellow to Brown, Maximum corrosion resistance generally used as final finish Class 2- Colorless to yellow, Moderate corrosion resistance, used as a paint base and for bonding to rubber Class 3- Colorless, Decorative, slight corrosion resistance, low electrical contact resistance Class 4- light green to green, Moderate corrosion resistance, used as a paint base and for bonding to rubber Not done at AST.
Yes, a rough correspondence between what comprises class 2 vs.
The materials are classified according to its coating thickness: No other units of measurement are included in this standard. July 22, A. Historical Version s – view previous versions of standard. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.
But even if you do, I’d suggest that you not certify compliance to a spec you don’t have on hand. Class 3- Clear or Yellow For protection against corrosion where low electrical resistance is required. It might be worth getting your customers to waive or except the requirement in writing, assuming your coupons are passing the SS test. Chromate conversion coatings are the most widely used coating for corrosion protection of Aluminum and Aluminum alloys minimizing surface oxidation.
Link to Active This link will always route to the current Active version of the standard. Chromate Conversion Coating also commonly referred to as Chemical Film, Chem Film, Alodine or Iridite converts the surface properties of the substrate typically aluminum or magnesium as compared to plating which applies a coating onto the surface of the substrate.
Chromate conversion coatings are normally applied by dipping: Aluminum and aluminum alloys are chromate coated in order to retard corrosion; as a base for organic films including paints, plastics, and adhesives; and as a protective coating having a low electrical contact impedance.
Class 1A- Yellow For maximum protection against corrosion, painted or unpainted. We get a small commission for maintaining their links, so we can keep them perpetually current Thank you for your help. It compares favorably with the hexavalent coatings providing a conversion coating that fulfills the corrosion, paint and electrical requirements of the different specifications.
I don’t believe coating wt.
Class 1; Class 2; Class 3; and Class 4. Both Hexavalent and Trivalent films at Advanced Surface Technologies have passed initial hour salt spray testing and are subject to monthly hour salt spray testing as well as paint adhesion testing conforming to all specifications.
ASTM B – 93() Standard Specification for Chromates on Aluminum
July 21, Q. Greg, it sure looks like it is available from ASTM at: Class 3- Clear For protection against corrosion where low electrical resistance is required. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
I can vouch that their pdf delivery works well at least on my computer, it did It is included in our internal testing matrix, but none of our customers require it and I can not find it in MIL-C, so I would like to remove it from monthly testing.
October 9, A. This specification covers the requirements relating to rinsed and non rinsed chromate conversion coatings on aluminum and aluminum alloys intended to give protection against corrosion and as a base for other coatings.
Chromate Conversion Coating
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Your Metal Finishing Solution.
It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. Class 1- Yellow to Brown, Maximum corrosion resistance generally used as final finish Class 2- Colorless to yellow, Moderate astj resistance, used as a paint base and for bonding to rubber Class 3- Colorless, Decorative, slight corrosion resistance, low electrical contact resistance Class 4- light green to green, Moderate corrosion resistance, used as a paint base and for bonding to rubber Not done at AST.
Joe Roter – Chatsworth, California, U. This abstract is a brief summary of the referenced standard.