ASTM B() Standard Specification for Chromates on Aluminum Scope
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Class 1- Yellow to Brown, Maximum corrosion resistance generally used as final finish Class 2- Colorless astmm 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.
I don’t believe coating wt.
ASTM B-449 Spec for Chromating Aluminum
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 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 1; Class 2; Class 3; and Class 4. October 9, A. Aluminum and aluminum alloys are chromate coated in order to wstm 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: Not sure my question was to the point. The materials are classified according to its coating thickness: 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. Your Metal Finishing Solution. We get a small commission for maintaining their links, so we can keep them asrm current Joe Roter – Chatsworth, California, U.
Historical Version s – view previous versions of standard. Link to Active This link will always route to the current Active version of the standard. Chromate conversion coatings are the most widely used coating for corrosion protection of Aluminum and Aluminum alloys minimizing surface oxidation.
Chromate provides excellent corrosion resistance, is conductive and results in no measurable buildup 0. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Chromate Classes Class 1- Yellow to Brown, Maximum corrosion resistance generally used as final finish Class 2- Colorless to yellow, Moderate corrosion resistance, b49-93 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. Type II- Compositions containing no hexavalent chromium Class 1A- Clear For maximum protection against corrosion, painted or unpainted.
Class 3- Clear For protection against corrosion where low asrm resistance is required. Class 3- Clear or Yellow For protection against corrosion where low electrical resistance is required.
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. Class 1A- Clear For maximum protection against corrosion, painted or unpainted. This abstract is a brief summary of the referenced standard. Class 1A- Yellow For maximum protection against corrosion, painted or unpainted.
ASTM B – 93() – Standard Specification for Chromates on Aluminum
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.
It’s not possible to diagnose a finishing problem or the b4499-93 of an operation via these pages.
It compares favorably with the hexavalent coatings providing a conversion coating that fulfills the corrosion, paint and electrical requirements of the different specifications.
We test coating wt. Chromate conversion coatings are normally applied by dipping: All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
No other units of measurement are included in this standard. S October 11, A. Thank you for your answer.
I can vouch that their pdf delivery works well at least on my computer, it did July 21, Q. July 22, A. 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 might be worth getting your customers to waive or except the requirement in writing, assuming your coupons are passing the SS test.
Those specs are somewhat similar, but I do not think there is any claim that they are “technically equivalent”.