ASTM B Standard Specification for Chromates on Aluminum. Advanced Plating Technologies, a Milwaukee company, offers Aluminum Chromate Conversion Coatings per MIL-C (MIL-DTL) and ASTM B Designation: B – 93 (Reapproved )´1Standard Specification for Chromates For referenced ASTM standards, visit the ASTM website, .org, or.
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Chromate conversion asmt are the most widely used coating for corrosion protection of Aluminum and Aluminum alloys minimizing surface oxidation. 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 aztm, 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.
Greg, it sure looks like it is available from ASTM at: It compares favorably with the hexavalent coatings providing a conversion coating that fulfills the corrosion, paint and electrical requirements of the different specifications. Chromate provides excellent corrosion resistance, is conductive and results in no measurable buildup 0. Class 1A coatings give maximum corrosion protection with the highest electrical surface resistance 4b49 class 3 coatings have lower corrosion protection and provide lower electrical surface resistance.
Class 3- Clear For protection against corrosion where low electrical resistance is required. Class 3- Clear For protection against corrosion where low electrical resistance is required. July 22, A. Chromate conversion coatings are normally applied by dipping: I can vouch that their pdf delivery works well at least on my computer, it did Class 1A- Clear For maximum protection against corrosion, painted or unpainted.
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 xstm films including paints, plastics, and adhesives; and as a protective coating having a low electrical contact impedance.
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Chromate Conversion Coating
All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. Yes, a rough correspondence between what comprises class 2 vs. It is asstm used for an undercoat for paint or adhesive applications due to the excellent bonding properties it provides.
The materials are classified according to its coating thickness: 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. No other units of measurement are included in this standard.
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.
Not sure my question was to the point. Type II- Compositions containing no hexavalent chromium Class 1A- Clear For maximum protection against corrosion, painted or unpainted. Thank you for your answer.
Chromate Conversion Coating
Class 1A- Yellow For maximum protection against corrosion, painted or unpainted. July 21, Q. I can vouch that their pdf delivery works well at least on my computer, it did 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.
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 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.
But even if you do, I’d suggest that you not certify compliance to a spec you don’t have on hand. 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.
ASTM B-449 Spec for Chromating Aluminum
Joe Roter – Chatsworth, California, U. Class 3- Clear or Yellow For protection against corrosion where low electrical resistance is required. Class 1; Class 2; Class 3; and Class 4. Materials qualified produce coatings that range in color from clear to iridescent yellow or brown. Joe Roter — Chatsworth, California, U. 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.