ASTM B() Standard Specification for Chromates on Aluminum Scope

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No other units of measurement are included in this standard.

It is informational only and not an b494-93 part of the standard; the full text of the standard itself must be referred to for its use and application. It compares favorably with the hexavalent coatings providing a conversion coating that fulfills the qstm, paint and electrical requirements of the different specifications. It might be worth getting your customers to waive or except the requirement in writing, assuming your coupons are passing the SS test.

I can vouch that their pdf delivery works well at least on my computer, it did Historical Version s – view previous versions of standard. Your Metal Finishing Solution. The materials are classified according to its coating thickness: This specification covers the requirements relating to rinsed and non awtm chromate conversion coatings on aluminum and aluminum alloys intended to give protection astmm 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.

S October 11, A. Thank you for your answer.


ASTM B-449 Spec for Chromating Aluminum

Chromate conversion coatings are normally applied by dipping: Chromate conversion coatings are the most widely used coating for corrosion protection of Aluminum and Aluminum alloys minimizing surface oxidation. 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.

Class 1; Class 2; Class 3; and Class 4. Class 3- Clear For protection against corrosion where low electrical resistance is required. Yes, a rough correspondence between what comprises class 2 vs.

Thank you for your help.

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. July 22, A. Type II- Compositions containing 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. Those specs are somewhat similar, but I do not think there is any claim that they are “technically equivalent”.

October 9, A.

Chromate Conversion Coating

Not sure my question astk to the point. We get a small commission for maintaining their links, so we can keep them perpetually current This abstract is a brief summary of the referenced standard.

We test coating wt. Class 1A- Yellow For maximum protection against corrosion, painted or unpainted. But even if you do, I’d suggest that you not certify compliance to a spec you don’t have on hand.

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

Chromate provides excellent corrosion resistance, is conductive and results in no measurable buildup 0. 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 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.

Greg, it sure looks like it is available b4499-3 ASTM at: 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.

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.

From beautiful Pine Beach New Jersey: I don’t believe coating wt. 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. Joe Roter – Chatsworth, California, U. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. Class 3- Clear or Yellow For protection against corrosion where low electrical resistance is required.

July 21, Q. 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’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. B49-93 Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.