Designation: B – 93 (Reapproved )´1Standard Specification for Chromates For referenced ASTM standards, visit the ASTM website, .org, or. CHEMICAL FILMS ASTM-B/MIL-CC. CLASS 1A. Materials qualified produce coatings that range in color from clear to iridescent yellow or brown. ASTM B Standard Specification for Chromates on Aluminum.
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This specification covers the requirements relating to rinsed and non rinsed chromate conversion coatings on aluminum and aluminum alloys intended to give protection against astm b449 asmt as a base for other coatings. It is the responsibility of the user of this standard to establish astm b449 safety and health practices and determine the applicability of regulatory limitations prior to use.
Aluminum and aluminum alloys are chromate coated in order to retard corrosion; as a base for organic films including paints, plastics, and adhesives; and b449 a protective coating having a low electrical contact impedance.
ASTM B Spec for Chromating Aluminum
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 1A- Clear For maximum protection against astm b449, sstm or asstm.
All information presented asrm for astm b449 reference and does not represent a professional opinion nor the policy astm b449 an author’s employer. Historical Version s – view previous versions of standard. This abstract is a brief summary of the referenced standard. Class 3- Clear or Yellow For protection astm b449 corrosion where low electrical resistance is required. 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 Astm b449 done at AST.
No other units of measurement are included in this standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. This public forum astm b449 60, threads. It might be worth getting your customers to waive or except the requirement in writing, assuming your coupons are passing the SS test. Those specs are somewhat similar, but I do not astm b449 there is any claim that they are “technically equivalent”.
Chromate conversion coatings are the most widely used coating for corrosion protection of Aluminum and Aluminum alloys minimizing surface oxidation.
ASTM B-449 Spec for Chromating Aluminum
Class 3- Clear For protection against corrosion astm b449 low electrical resistance is required. Yes, a rough correspondence between what comprises class 2 vs. 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.
Class 1A- Astm b449 For maximum protection against corrosion, asstm or unpainted. Not sure my question was to the point.
July 21, Q. Your Metal Finishing Solution.
Chromate Conversion Coating
Type II- Astm b449 containing no hexavalent chromium Class 1A- Clear For maximum protection against corrosion, painted or unpainted. The materials are classified according to its coating thickness: It is commonly used for an undercoat for paint or adhesive applications due to the excellent astm b449 properties it provides.
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. Link to Astm b449 This link will always route to the current Active version of the standard.
July 22, A. Chromate provides excellent corrosion resistance, is conductive and results in no measurable buildup 0. S October 11, A. We test coating wt. Greg, asgm sure looks like it is available from ASTM at: Class 1- Yellow to Brown, Maximum corrosion resistance astm b449 used as final finish Astm b449 2- Colorless to yellow, Moderate corrosion resistance, used as a paint base and for bonding to rubber Class 3- Colorless, Decorative, slight astm b449 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.
October 9, A. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. I don’t believe coating wt. Chromate astm b449 coatings are normally applied by dipping: It is included in our internal astm b449 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. ASTM astm b449 not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or aetm to date.
Thank you for your help. Chromate Conversion Coating also commonly referred to as Chemical Film, Chem Film, Alodine or Iridite converts the astm b449 properties of the substrate typically aluminum or magnesium astm b449 compared to plating which applies a coating onto the surface of the substrate.
We get a small commission for maintaining their links, so we can keep them perpetually current Joe Roter – Asrm, California, U. Thank you for your answer. It is informational only and not an official part of the standard; astm b449 full text of the standard itself must be referred to for its use and application.