ASTM B() Standard Specification for Chromates on Aluminum Scope
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No other units of measurement are included in this standard. Yes, a rough correspondence between what comprises class 2 vs. 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 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.
Those specs are somewhat similar, but I do not think there is any claim that they are “technically equivalent”. 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 qstm 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.
ASTM B-449 Spec for Chromating Aluminum
October 9, A. 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. 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 3- Clear For protection against corrosion where low electrical resistance is required. ASTM does not give any warranty express or implied or bb449-93 any representation that the contents of this abstract are accurate, complete or up to date. Link to Active This link will always route to the current Active version of the standard. Chromate provides excellent corrosion resistance, is conductive and results in no measurable buildup 0.
Historical Version s – view previous versions of standard. July 21, Q.
Not sure my question was to the point. 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. Chromate conversion coatings are normally applied by dipping: Class 3- Clear or Yellow For protection against corrosion where low electrical resistance is required.
Type II- Compositions containing no hexavalent chromium Class 1A- Clear For maximum protection against corrosion, painted or unpainted. I can vouch that their pdf delivery works well at least on my computer, it did 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.
Class 1A- Clear For maximum protection against corrosion, painted or unpainted. 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. This abstract is a brief summary of the referenced standard.
The materials are classified according to its coating thickness: Asmt don’t believe coating wt. 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- Yellow For maximum protection against corrosion, painted or unpainted.
ASTM B Spec for Chromating Aluminum
From beautiful Pine Beach New Jersey: But even if you do, I’d suggest that you not certify compliance to a spec you don’t have on hand. It is included in our internal testing matrix, but asm of our customers require it and I can not find it in MIL-C, so I would like to remove it from monthly testing. Thank you for your answer.
July 22, A. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
ASTM B449 – 93(2015)
We get a small commission for maintaining their links, so we can keep them perpetually current Greg, it sure looks like it is available from ASTM at: Chromate conversion coatings are the most widely used coating for corrosion protection of Aluminum and Aluminum alloys minimizing surface oxidation. It might be worth getting your customers to waive or except the requirement in writing, assuming your coupons are passing the SS test. Your Metal Finishing Solution. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.
ASTM B – 93() Standard Specification for Chromates on Aluminum
Thank you for your help. Class 1A coatings give maximum corrosion protection asttm the highest electrical surface resistance while class 3 coatings have lower corrosion protection and provide lower electrical surface resistance. Class 1; Class 2; Class 3; and Class 4. We test coating wt. It compares favorably with the hexavalent coatings providing a conversion coating that fulfills the corrosion, paint and electrical requirements of the different specifications.