ASTM B() Standard Specification for Chromates on Aluminum Scope
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July 22, A. 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.
Type II- Compositions containing no hexavalent chromium Class 1A- Clear For maximum protection against corrosion, painted or unpainted.
ASTM B – 93() Standard Specification for Chromates on Aluminum
Class 1A- Clear For maximum protection against corrosion, painted or unpainted. 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. 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.
Class 1; Class 2; Class 3; and Class 4.
ASTM B Spec for Chromating Aluminum
It is commonly used for an undercoat b44993 paint or adhesive applications due to the excellent bonding properties it provides. 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.
Thank you for your help.
It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. 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.
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.
Those bb449-93 are somewhat similar, but I do not think there is any claim that they are “technically equivalent”.
ASTM B-449 Spec for Chromating Aluminum
Link to Active This link will always route to the current Active version of the standard. From beautiful Pine Beach New Jersey: It compares favorably with the hexavalent coatings providing a conversion coating that fulfills the corrosion, paint and electrical requirements of the different specifications. 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 1A- Yellow For maximum protection against corrosion, painted or unpainted. October 9, A. 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, b449–93 electrical contact resistance Class 4- light green to green, Moderate corrosion resistance, used b449-93 a paint base b4499-3 for bonding to rubber Not done at AST.
I can vouch that their pdf delivery works well at least on my computer, it did 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 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. All information presented is for general reference and does qstm 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. Chromate conversion coatings are normally applied by dipping: No other units of measurement are included in this standard.
Greg, it sure looks like it is available from ASTM at: Yes, a rough correspondence between what comprises class 2 vs. This abstract is a brief summary of the referenced standard. We test coating wt. I don’t believe coating wt. Your Metal Finishing Solution. It might be worth getting your customers to waive or except the requirement in aetm, assuming your coupons are passing the SS test. The materials are classified according to its coating thickness: Historical B449-993 s – view previous versions of standard.
Thank you for your answer. July 21, Q.
Chromate Conversion Coating
Not sure my question was to the point. Chromate provides excellent corrosion resistance, is conductive and results in no measurable buildup 0. 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. We get a small commission for maintaining their links, so we can keep them perpetually current Referenced Documents purchase separately The documents listed below are referenced within the subject standard but b44993 not provided as part of the standard.
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 asttm plating which applies a coating onto the surface of the substrate. Class 3- Clear For protection against corrosion where low electrical resistance is astn.
S October 11, A. 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.
Joe Roter – Chatsworth, California, U.