Chromate Free Talc Chemical Conversion Coatings For Aluminum Alloys

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Chromate Free Talc Chemical Conversion Coatings For Aluminum Alloys

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Author :
language : en
Publisher:
Release Date : 1993

Chromate Free Talc Chemical Conversion Coatings For Aluminum Alloys written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.

We have found that aluminum alloys exhibit unusual passivity when exposed to alkaline Li-salt solutions. Observed passivity is due to the formation of a polycrystalline Li2[Al2(OH)6]2·CO3·3H2O film on the aluminum surface. This film is persistent in aggressive environments and provides a significant degree of corrosion protection. On this basis, we have developed a simple non-electrolytic method of forming corrosion resistant coatings in alkaline Li-salt solution. This process is procedurally similar to traditional conversion coating methods, offers desirable properties, and has a low toxic hazard. In this paper, coating methods, coating characterization, and coating properties are presented. Results from parallel test performed with a commercial chromate conversion coatings are presented for comparison.

Non Chromate Talc Conversion Coatings For Aluminum

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Author :
language : en
Publisher:
Release Date : 1994

Non Chromate Talc Conversion Coatings For Aluminum written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.

A method was developed for applying an inorganic conversion coating on that is procedurally similar to chromate conversion coating methods; this method, however does not use or involve hazardous/toxic chemicals. The coating forms by precipitation involving Al{sup 3+} Li, OH−, CO32-, and possibly other anions. This polycrystalline coating is continuous, conformal and persistent in aggressive environments. Coating thicknesses range from several tenths to ten micrometers. Although the outer portions of the coating are porous, the pores do not penetrate to the substrate interface. These coatings do not match the levels of performance offered by commercially available chromate conversion coatings, but are capable of meeting many of the corrosion resistance, electrical resistivity, and paint adhesion requirements established in MIL-C-5541E ''Chemical Conversion Coatings on Aluminum and Aluminum Alloys.'' In this paper, methods for producing the talc coating on aluminum alloys 1100 and 6061-T6 are described and compared to traditional chromate conversion coating methods. Resulting coating structure and composition are described. Performance data for the talc coatings in MIL-C-5541E required tests are presented along with data commercial chromate-based coatings.

Chromate Free Corrosion Resistant Talc Coatings For Aluminum Alloys

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Author :
language : en
Publisher:
Release Date : 1992

Chromate Free Corrosion Resistant Talc Coatings For Aluminum Alloys written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.

Passivity developed by immersion in an alkaline Li salt solution is retained when the Al surface is exposed to an aggressive solution like aerated NaCl. A process for coating Al was developed using a method similar to the chromate conversion process, imparts appreciable corrosion resistance, but does not use or produce hazardous chemicals. Coatings are formed by immersion in 0.1 M Li carbonate solution whose pH is adjusted to 11.5-12.0 by LiOH additions. Immersion times of 1.5 to 90 min were used to produce talc coatings; best time is 15 min. Increased corrosion resistance is obtained if the coating is sealed by elevated temperature treatment in air or distilled water.

Proceedings Of The Symposium On Corrosion Protection By Coatings And Surface Modification

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Author : Martin W. Kendig
language : en
Publisher:
Release Date : 1993

Proceedings Of The Symposium On Corrosion Protection By Coatings And Surface Modification written by Martin W. Kendig and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Corrosion and anti-corrosives categories.

Chromate Free Corrosion Resistant Conversion Coatings For Aluminum Alloys

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Author :
language : en
Publisher:
Release Date : 1995

Chromate Free Corrosion Resistant Conversion Coatings For Aluminum Alloys written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.

Inorganic polycrystalline hydrotalcite, Li2[Al2(OH)6]2·CO3·3H2O, coatings can be formed on aluminum and aluminum alloys by exposure to alkaline lithium carbonate solutions. This process is conducted using methods similar to traditional chromate conversion coating procedures, but does not use or produce toxic chemicals. The coating provides anodic protection and delays the onset of pitting during anodic polarization. Cathodic reactions are also inhibited which may also contribute to corrosion protection. Recent studies have shown that corrosion resistance can be increased by sealing hydrotalcite coated surfaces to transition metal salt solutions including Ce(NO3)3, KMnO4 and Na2MoO4. Results from these studies are also reported.

Processing And Properties Of Chromate Free Conversion Coatings On Aluminum

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Author :
language : en
Publisher:
Release Date : 1994

Processing And Properties Of Chromate Free Conversion Coatings On Aluminum written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1994

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.

Assessment Of Chemical Conversion Coatings For The Protection Of Aluminium Alloys

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Author : A. M. Pereira
language : en
Publisher:
Release Date : 2008

Assessment Of Chemical Conversion Coatings For The Protection Of Aluminium Alloys written by A. M. Pereira and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Aluminium alloys categories.

Metals Abstracts

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Author :
language : en
Publisher:
Release Date : 1998

Metals Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Metallurgy categories.

Energy Research Abstracts

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Author :
language : en
Publisher:
Release Date : 1994

Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Power resources categories.