ASTM B449-93 PDF
ASTM B() Standard Specification for Chromates on Aluminum Scope
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ASTM B Spec for Chromating Aluminum
V449-93 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 b4499-93 and for bonding to rubber Class 3- Colorless, Decorative, slight corrosion resistance, low b4499-93 contact resistance Class 4- light green to green, Moderate corrosion resistance, used as 4b49-93 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. Chromate conversion coatings are normally applied by dipping: 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. It compares favorably with the hexavalent coatings providing a conversion coating that fulfills the corrosion, paint and electrical requirements of the different specifications.
Link to Active This link will always route to the current Active version of the standard. Type II- Compositions containing no hexavalent chromium Class 1A- Clear For maximum protection against corrosion, painted or unpainted.
But even if you do, I’d suggest that you not certify compliance to a spec you don’t have on hand. July 22, A. Thank you for b449-9 help. We test coating wt. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Class 1A- Clear For maximum protection against corrosion, painted or unpainted. No other units of measurement are included in this standard. Thank you for your answer. 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’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. 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.
ASTM B – 93() – Standard Specification for Chromates on Aluminum
It is commonly used for an undercoat for paint or adhesive applications due to the excellent bonding properties it provides. Yes, a rough correspondence between what comprises class 2 vs. July 21, Q. I astmm vouch that their pdf delivery works well at least on my computer, it did Chromate conversion coatings are the most widely used coating for corrosion protection of Aluminum and Aluminum alloys minimizing surface oxidation.
Joe Roter – Chatsworth, California, U. asym
ASTM B-449 Spec for Chromating Aluminum
ASTM does not give any warranty b449-9 or implied or make any representation that the contents of this abstract are accurate, complete or up to date. 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- Yellow For maximum protection against corrosion, painted or unpainted.
Chromate provides excellent corrosion resistance, is conductive and results in no measurable buildup 0.
Class 1; Class 2; Class 3; and Class 4. The materials are classified according to its coating thickness: I don’t believe coating wt. Class 3- Clear For protection against corrosion where low electrical resistance is required. We get a small commission for maintaining their links, so we can keep them perpetually current 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.
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.
It is informational only and not zstm official part of the standard; the full text of the standard itself must be referred to for its use and application. S October 11, A.
Advanced Surface Technologies extensive experience h449-93 the chromate process enables us to effectively process cast and all the different wrought alloys with alloy specific pre-treatment chemistries.
From beautiful Pine Beach New Jersey: All information presented is for general reference and adtm not represent a professional opinion nor the policy of an author’s employer.
This abstract is a brief summary of the referenced 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.
Greg, it sure looks like it is available from ASTM at: Those specs are somewhat similar, but I do not think there is any claim that they are “technically equivalent”. Your Metal Finishing Solution. October 9, A.