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 Designation: B – 93 (Reapproved )´1Standard Specification for Chromates For referenced ASTM standards, visit the ASTM website, .org, or.

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Class 1; Class 2; Class 3; and Class 4. We test coating wt. 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.

October 9, A.

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. This specification covers the requirements relating to rinsed and non g449 chromate conversion coatings on aluminum and aluminum alloys intended to give protection against corrosion and as a base for other coatings. 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.

It compares favorably with the hexavalent coatings providing a conversion coating that fulfills the corrosion, paint and electrical requirements of asm different specifications. But even if you do, I’d suggest that you not certify compliance to a spec you don’t have astj hand. Not sure my question was to the point. 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. Chromate provides excellent corrosion resistance, is conductive and results in no measurable buildup 0.

All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. This abstract is a brief summary of the referenced standard.

Greg, it sure looks like it is available from ASTM at: Class 1A- Clear For maximum protection against corrosion, painted or unpainted. Your Metal Finishing Solution. It is commonly used for an undercoat for paint or adhesive applications due to the excellent bonding properties it provides. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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Materials qualified produce coatings that range in color from clear to iridescent yellow or brown.

ASTM B-449 Spec for Chromating Aluminum

Chromate conversion coatings are normally applied by dipping: The materials are classified according to its coating thickness: 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- Awtm, Decorative, slight corrosion resistance, low electrical contact resistance Class 4- light green to green, Moderate corrosion resistance, used as satm paint base and for bonding to rubber Not done at AST.

Thank you for your help. Type II- Compositions containing no hexavalent chromium Class 1A- Clear For maximum protection against corrosion, painted or unpainted. It might be worth getting your customers to waive or except the requirement in writing, assuming your coupons are passing the SS test.

Class 1A coatings give maximum corrosion protection with the highest electrical surface resistance while class 3 coatings have lower corrosion protection and provide lower electrical surface resistance. Chromate conversion coatings are normally applied by dipping: Class 1; Class 2; Class 3; and Class bb449.

It might be worth getting your customers to waive or except the requirement in writing, assuming your coupons are passing the SS test. Class 3- Clear For protection against corrosion where low electrical resistance is required. 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.

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. Class 1A coatings give maximum corrosion protection with the highest electrical surface resistance while class 3 coatings have lower corrosion protection and provide lower electrical surface resistance.

ASTM B Spec for Chromating Aluminum

Advanced Surface Technologies extensive experience with the chromate process enables us to effectively process cast and all the different wrought alloys with alloy specific pre-treatment chemistries.

Link to Active This link will always route to the current Active version of the standard. Class 3- Clear For protection against corrosion where low electrical resistance is required.

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Chromate conversion coatings are the most widely used coating for corrosion protection of Aluminum and Aluminum alloys minimizing surface oxidation. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.

Thank you for your answer. Class 3- Clear or Yellow For protection against corrosion where low electrical resistance is required. Link to Active This link will always route to the current Active version of the standard. It is informational only and not an official part b the standard; the full text of the standard itself must be referred to for its use and application.

Thank you for your answer. Historical Version s – view previous versions of standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Yes, a rough correspondence between what comprises class 2 vs. Buy x Banner Ads. 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.

July 22, A. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM B – 93() Standard Specification for Chromates on Aluminum

Advanced Surface Technologies extensive experience with the chromate process enables us to effectively process cast and all the different wrought alloys with alloy specific pre-treatment chemistries. 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. It compares favorably with the hexavalent coatings providing a conversion coating that fulfills the corrosion, paint and electrical requirements of the different specifications.

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