ASTM B() Standard Specification for Chromates on Aluminum Scope
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ASTM B – 93() Standard Specification for Chromates on Aluminum
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. 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. From beautiful Pine Beach New Jersey: Chromate provides excellent corrosion resistance, is conductive and results in no measurable buildup 0. Not sure my question was to the point. Class 1; Class 2; Class 3; and Class 4.
We test coating wt.
Greg, it sure looks like it is available from ASTM at: Class asm Clear For protection against corrosion where low electrical resistance is required. I don’t believe coating wt. 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. But b49-93 if you do, I’d suggest that you not certify compliance to a spec you don’t have on hand.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. 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.
Chromate conversion coatings are normally applied by dipping: The materials are classified according to its coating thickness: Type II- Compositions containing no hexavalent chromium Class b49-93 Clear For maximum protection against corrosion, painted or unpainted. Thank you for your adtm. Your Metal Finishing Solution.
Link to Active This link will always route to the current Active version of the standard. Those specs are somewhat similar, but I do not think there is any claim that they are “technically equivalent”.
S October 11, A.
Class 1A- Yellow 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 ashm a protective coating having a low electrical contact impedance.
Yes, a rough correspondence between what comprises class 2 vs. 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. We get a small commission for maintaining their links, so we can keep them perpetually current July 21, Q.
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.
No asmt units of measurement are included in this standard. Thank you for your answer.
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. Historical N449-93 s – view aatm versions of 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.
It is commonly used for an undercoat for paint or adhesive applications due to the excellent bonding properties it provides.
This abstract is a brief summary of the referenced standard.