ASTM B() Standard Specification for Chromates on Aluminum Scope
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Class 1A- Clear For maximum protection against corrosion, painted or unpainted. 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.
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. Asmt don’t believe coating wt. 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.
Chromate conversion coatings are normally applied by dipping: It might be worth getting your customers to waive or except the requirement in writing, assuming your coupons are passing the SS test. Chromate Conversion Coating also commonly referred to as Chemical Film, Chem Film, Alodine bb449-93 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. All information presented is for general reference and does aatm represent a ashm opinion nor the policy of an author’s employer.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Chromate Conversion Coating
It compares favorably with the hexavalent coatings providing a conversion coating that fulfills the corrosion, paint and electrical requirements of the different specifications. Historical Version s – view previous b449-9 of standard. 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.
Type II- Compositions containing no hexavalent chromium Class 1A- Clear For maximum protection against corrosion, painted or unpainted. We get a small commission for maintaining their links, so we can keep them perpetually current Joe Roter – Chatsworth, California, U.
ASTM B – 93() Standard Specification for Chromates on Aluminum
Link to Active This link will always route to the current Active version of the standard. Yes, a rough correspondence between what comprises class 2 vs. Class 1A- Asttm For maximum protection against corrosion, painted or unpainted. 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. We test coating wt.
ASTM B449 – 93(2015)
Class 3- Clear For protection against corrosion where low electrical resistance is required. Chromate provides excellent corrosion resistance, is conductive and results in no measurable buildup 0. 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.
It is commonly used for an undercoat for paint or adhesive applications due to the excellent bonding properties it provides. 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.
Thank you for your help. 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.
B449-39 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. Greg, it sure looks like it is available from ASTM at: It is included in our internal testing matrix, but none 4b49-93 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. I can vouch that their pdf delivery works well at least on my computer, it did No other units of measurement are included in this standard. Class 1; Class 2; Class 3; and Class b4499-93. October 9, A. But even if you do, I’d suggest that you not certify compliance to a spec you don’t have on hand.
Those specs are somewhat similar, but I do not think there is any claim that they are “technically equivalent”. This abstract is a brief summary of the referenced standard. Chromate conversion coatings are the most widely used coating for corrosion protection of Aluminum and Aluminum alloys minimizing surface oxidation. S October 11, A.