Electrochemical evaluation of the compatibility of fresh and aged Novecac 71IPA with beryllium, stainless uranium, 304L stainless steel, and 2024-T3 aluminum alloy

This study was a material compatibility assessment of four metals (beryllium, stainless uranium, 304L stainless steel, and 2024-T3 aluminum) with an environmentally benign, non-aqueous, near-azeotropic mixture of hydrofluoroether (Novecac 7100) with 4.5 wt% isopropanol designated Novecac 71IPA. The...

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Published inElectrochimica acta Vol. 83; pp. 490 - 500
Main Authors Petry, Leanne, Hansen, Douglas C, Wittberg, Thomas N, Barklay, Chadwick D, Kramer, Daniel P, Yoon, Yuhchae, Knachel, Howard C, Birkbeck, Janine C, Russell, Bobby G, Moddeman, William E
Format Journal Article
LanguageEnglish
Published 30.11.2012
Subjects
Alloy steels
Aluminum base alloys
Austenitic stainless steels
Beryllium oxide
Cleaning
Fluorides
Metal surfaces
Solvents
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Summary:This study was a material compatibility assessment of four metals (beryllium, stainless uranium, 304L stainless steel, and 2024-T3 aluminum) with an environmentally benign, non-aqueous, near-azeotropic mixture of hydrofluoroether (Novecac 7100) with 4.5 wt% isopropanol designated Novecac 71IPA. The intent is to use the Novecac 71IPA to clean materials in sensitive, long-term assemblies. There is concern when an aged solvent is used to clean a metal surface, it may cause corrosion due to fluoride formation as the solvent ages. Two solvent conditions, one having no detectable fluoride (fresh) and the other with aY17 ppm fluoride (aged) were evaluated. Electrochemical evaluations using impedance spectroscopy were performed to monitor the metal surfaces for signs of reaction. Microscopic and spectroscopic techniques, including X-ray photoelectron spectroscopy, were used to characterize the metal surfaces before and after electrochemical tests. Increased impedance was observed when beryllium substrates were exposed to fresh or aged Novecac 71IPA and was attributed to formation of organic and/or inorganic films on native beryllium oxide. Other metals exhibited insignificant changes in impedance but did show some passive film formation. Results confirmed Novecac 71IPA, containing up to 17 ppm fluoride, had no corrosive effect on the four tested metals and may be used to safely clean them.
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ISSN:0013-4686