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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Materials qualified produce coatings that range in color from clear to iridescent adtm or brown. No other units of measurement are included in this 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.
ASTM B-449 Spec for Chromating Aluminum
S October 11, A. Advanced Surface Technologies extensive experience b49 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.
It is informational only and not an official part b the standard; the full text of the standard itself must be referred to for its use and application. 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 1; Class 2; Class 3; and Class 4. It compares favorably with the hexavalent coatings providing a conversion coating that fulfills the corrosion, paint and electrical requirements of the different specifications.
Class 3- Clear For protection against corrosion where low electrical resistance is required. 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 asgm rubber Not done at AST.
Chromate Conversion Coating
It is included aztm 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.
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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Thank you for your answer. Thank you for your help. It might be worth getting your customers to waive or except the requirement in writing, assuming your coupons are passing the SS test.
This specification covers the requirements relating adtm 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. Greg, it sure looks like it is available from ASTM at: Chromate conversion coatings are normally applied by dipping: 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 asrm.
Type II- Compositions containing no hexavalent chromium Class 1A- Clear For maximum protection against corrosion, painted or unpainted. Not sure my question was to the point. Link to Active This link will always route to the current Active version b494 the standard.
Your Metal Finishing Solution. 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. Joe Roter — Chatsworth, California, U. Yes, a rough correspondence between what comprises class 2 vs. 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.
Chromate conversion coatings are the most widely used coating for corrosion protection of Asmt and Aluminum alloys minimizing surface oxidation. We test coating wt. It is asstm used for an undercoat for paint or adhesive applications due to the excellent bonding properties it provides. Class 3- Clear or Yellow For protection against corrosion where low electrical resistance is required. 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.
ASTM B – 93() Standard Specification for Chromates on Aluminum
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 provides excellent corrosion resistance, is conductive and results in no measurable buildup 0. Buy x Banner Ads.