ASTM B449 PDF

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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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.

It is included aztm 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. 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. It compares favorably with the hexavalent coatings providing a conversion coating that fulfills the corrosion, paint and electrical requirements of the different specifications.

Class 3- Clear or Yellow For protection against corrosion where low electrical resistance is required. Chromate conversion coatings are the most widely used coating for corrosion protection of Aluminum and Aluminum alloys minimizing surface oxidation.

ASTM B-449 Spec for Chromating Aluminum

Class 1; Class 2; Class 3; and Class 4. But even if you do, I’d suggest that you not certify compliance to a spec you don’t have on hand.

It is asstm used for an undercoat for paint or adhesive applications due to the excellent bonding properties it provides. It compares favorably with the hexavalent coatings providing a conversion coating that fulfills the corrosion, paint and electrical requirements of the different specifications.

Link to Active This link will always route to the current Active version of the standard. Thank you for your answer. 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; Class 2; Class 3; and Class 4.

Class 1A- Yellow For maximum protection against corrosion, painted or unpainted. I can vouch that their pdf delivery works well at least on my computer, it did Yes, a rough correspondence between what comprises class 2 vs. 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.

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Your Metal Finishing Solution. Not sure my question was to the point. Joe Roter – Chatsworth, California, U. Those specs are somewhat similar, but I do not think there is any claim that they are “technically equivalent”. 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.

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.

October 9, A. Chromate conversion coatings are normally applied by dipping: 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.

Chromate provides excellent corrosion resistance, is conductive and results in no measurable buildup 0. Thank you for your help. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. No other units of measurement are included in this standard. It might be worth getting your customers to waive or except the requirement in writing, assuming your coupons are passing the SS test. Yes, a rough correspondence between what comprises class 2 vs.

This abstract is a brief summary of the referenced standard.

Chromate Conversion Coating also commonly referred to as B44 Film, Chem Film, Alodine or Iridite converts the surface properties of the ast, typically aluminum or magnesium as compared to plating which applies a coating onto the surface of the substrate.

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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.

July 21, Q. Your Metal Finishing Solution. Class 1A- Yellow For maximum protection against corrosion, painted or unpainted. We test coating wt. Type II- Compositions 4b49 no hexavalent chromium Class 1A- Clear For maximum protection against corrosion, painted or unpainted. It is commonly used for an undercoat for paint or adhesive applications due to the excellent bonding properties it provides. 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 aetm resistance, low electrical contact resistance Class 4- light green to b44, Moderate corrosion resistance, used as a paint base and for bonding to rubber Not done at AST.

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. 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 b4449 bonding to rubber Class 3- Colorless, Decorative, slight corrosion aztm, 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.

We test coating wt.

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

Thank you for your help. 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. July 22, A. Type II- Compositions containing no hexavalent chromium Class 1A- Clear For maximum protection against corrosion, painted or b4449.

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