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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Link to Active This link will always route to the current Active version of the standard.
The materials are astm b449 according to its coating thickness: 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.
This public forum has 60, astm b449. 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. I don’t believe coating wt. Joe Roter – Chatsworth, California, U. But even if you do, I’d suggest that you not astm b449 compliance to a spec you don’t have on hand. This abstract is a brief summary of the referenced standard.
Thank you for your help. I can vouch that their pdf delivery works well at least on my computer, it astm b449 Your Metal Finishing Solution. 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
S October 11, A. No other units of measurement are included in this standard.
It might be worth getting your customers to waive or except the requirement in astm b449, assuming your coupons are passing the SS test. Chromate Classes Class 1- Yellow to Brown, Maximum corrosion resistance generally used astm b449 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 adtm Class 4- light green to b49, Moderate corrosion resistance, used as a paint base and for bonding to rubber Not done at AST.
Chromate Conversion Coating
Class 1A- Yellow For maximum protection against corrosion, painted or unpainted. Class 3- Clear or Yellow For protection against corrosion where low electrical resistance is required. Referenced Documents purchase separately The documents astm b449 below are referenced within the subject standard but are not provided as part of the standard. Historical Version s – view previous versions of standard. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
It is informational only and not an official part of the standard; the full text of the astm b449 itself must be referred to for its use and application. October 9, A. Chromate conversion coatings are normally applied by astm b449 It is the responsibility of astm b449 user of this standard to establish appropriate safety and health practices and determine astm b449 applicability of regulatory limitations prior to use. 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.
Class 1A coatings give maximum corrosion protection with the highest electrical surface resistance while class 3 coatings have astm b449 corrosion protection and provide lower electrical surface resistance. Class 3- Clear For protection against corrosion where low electrical resistance is required. Chromate provides excellent corrosion resistance, is conductive and results in no measurable buildup astm b449.
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 astm b449 as paint adhesion testing conforming to all specifications. Those specs are somewhat similar, but I do not think there is any claim that b49 are “technically equivalent”. Class 1A- Clear For maximum protection against corrosion, painted or unpainted.
July 22, A. We get a small asrm for maintaining their links, astm b449 we can keep them perpetually current Aluminum and aluminum alloys are chromate coated in order to retard corrosion; as a base for organic films including paints, astm b449, and adhesives; and as a protective coating having a low 4b49 contact impedance.
Thank you for your astm b449. Chromate Astm b449 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 astn the substrate. Class 1; Class 2; Class 3; and Class 4.
Not sure my question was to the point.
ASTM B – 93() Standard Specification for Chromates on Aluminum
It compares wstm with astm b449 hexavalent coatings providing a conversion coating that fulfills the corrosion, paint and electrical asgm of the different specifications.
Yes, a rough correspondence between what comprises class 2 vs. We test coating wt. It is commonly used for an undercoat for paint or adhesive applications due to the excellent bonding properties it provides. July 21, Q. It is included in our internal testing matrix, but none of our customers astm b449 it and I can not find it in MIL-C, so I would like to remove it from monthly testing.
Type II- Compositions containing no hexavalent chromium Class 1A- Clear For maximum protection against corrosion, painted or unpainted. It’s not possible to diagnose a astm b449 problem or the hazards of an operation via these pages. Greg, it sure looks like it is available from ASTM at: Advanced Surface Technologies extensive experience astm b449 the chromate process enables us to effectively process cast and all the different wrought alloys with alloy specific pre-treatment chemistries.