ASTM B() Standard Specification for Chromates on Aluminum Scope
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S October 11, A. It is the responsibility of the user of this standard to establish appropriate safety asym health practices and determine the applicability of regulatory limitations prior to use. Type II- Compositions containing no hexavalent chromium Class 1A- Clear For maximum protection against corrosion, painted or unpainted.
July 21, Q. Link to Active This link will always route to the current Active version of the standard.
ASTM B449 – 93(2015)
Historical Version s – view previous versions of standard. Greg, it sure looks like it is available from ASTM at: July 22, A. ASTM does not give any warranty express or implied or make any b4499-3 that the contents of this abstract are accurate, complete or up to date.
Class 1A- Yellow For maximum protection against corrosion, painted or unpainted. Thank you for your help.
Chromate Conversion Coating
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 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. It compares favorably with the hexavalent coatings providing a conversion coating that fulfills the corrosion, paint and electrical requirements of the different specifications.
This abstract is a brief summary of the referenced standard. But even if you do, I’d suggest that you not certify compliance to a spec you don’t have on hand. No other units of measurement are included in this standard.
Joe Roter – Chatsworth, California, U.
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. It is commonly used for an undercoat for paint or adhesive applications due to the excellent bonding properties it provides.
October 9, A. 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.
ASTM B – 93() – Standard Specification for Chromates on Aluminum
Not sure my question was to the point. 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.
Thank you for your answer. The materials are classified according to its coating thickness: Class 3- Clear For protection against corrosion where low electrical resistance is required.
I don’t believe coating wt. Aluminum and aluminum alloys are chromate coated in order to retard corrosion; as a base for organic films including paints, plastics, b4449-93 adhesives; and as a protective coating having a low electrical contact impedance. It might be worth getting your customers to waive or except the requirement in writing, assuming your coupons are passing the SS test.
It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. It is included in our internal testing matrix, but none of our customers require it and I can not find it in B449-39, so I would like to remove it from monthly testing.
Both Hexavalent and Trivalent films at Advanced Surface Technologies have passed initial b44993 salt spray testing and are subject to monthly hour salt spray testing as well as paint adhesion testing conforming to all specifications.
Those specs are somewhat similar, but I do not think there is any claim that they are “technically equivalent”. Chromate provides excellent corrosion resistance, is conductive and results in no measurable buildup 0.
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.
Class 3- Clear or Yellow For protection against corrosion where low electrical resistance is required. From beautiful Pine Beach New Jersey: We get a small commission for maintaining their links, so we can keep them perpetually current 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.
We test coating wt. Yes, a rough correspondence between what comprises class 2 vs. 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. Chromate conversion coatings are the most widely used coating for corrosion protection of Aluminum and Aluminum alloys minimizing surface oxidation.
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. Your Metal Finishing Solution. Class 1; Class 2; Class 3; and Class 4.