ASTM B449 PDF

ASTM B449 PDF

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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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. 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.

Class 3- Clear or Yellow For protection against corrosion where low electrical resistance is required. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Chromate provides excellent corrosion resistance, is conductive and results in no measurable buildup 0. Materials qualified produce coatings that range in color from clear to iridescent yellow or brown. Greg, it sure looks like it is available from ASTM at: Joe Roter – Chatsworth, California, U.

Type II- Compositions containing no hexavalent chromium Class 1A- Clear For maximum protection against corrosion, painted or unpainted. 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. Thank you for your help.

It is asstm used for an undercoat for paint or adhesive applications due to the excellent bonding properties it provides. 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.

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Chromate Conversion Coating

Those specs are somewhat similar, but I do not think there is any claim that they are “technically equivalent”. 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. 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 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.

No other units of measurement are included in this standard. 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 conversion coatings are the most widely used coating for corrosion protection of Aluminum and Aluminum alloys minimizing surface oxidation. Link to Active This link will always route to the current Active version of the standard. Not sure my question was to the point.

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. Greg, it sure looks like it is available from ASTM at: S October 11, A. 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.

Chromate Conversion Coating

Type Zstm Compositions containing no hexavalent chromium Class 1A- Clear For maximum protection against corrosion, painted or unpainted.

From beautiful Pine Beach New Jersey: S October 11, A. Class 1; Class 2; Class 3; and Class 4. Thank you for your answer. It is informational only and not an official part of the standard; the full text aztm the standard itself must be referred to for its use asym application.

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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 wstm 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 lower corrosion protection and provide lower electrical surface resistance.

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.

The materials are classified according to its coating thickness: I can vouch that their pdf delivery works well at least on my computer, it did Yes, a rough correspondence between what comprises class 2 vs. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory asstm prior to use.

Class 3- Clear For protection against corrosion where low electrical resistance is required. 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 to rubber Not done at AST.