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Iodine Vapor Passivation of Indium and It's Alloys

IP.com Disclosure Number: IPCOM000086258D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Harvilchuck, JM: AUTHOR

Abstract

The hydrolysis corrosion of indium, In, by chlorides involves only the trivalent In species. Iodide ion stabilizes the In valence at the monovalent state as insoluble nonhydrolysable In I. No chloride hydrolysis of In/+3/ or its alloys occurs to any significant extent after its surface is reacted to form an indium iodide coating. An example of the process is as follows:

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Iodine Vapor Passivation of Indium and It's Alloys

The hydrolysis corrosion of indium, In, by chlorides involves only the trivalent In species. Iodide ion stabilizes the In valence at the monovalent state as insoluble nonhydrolysable In I. No chloride hydrolysis of In/+3/ or its alloys occurs to any significant extent after its surface is reacted to form an indium iodide coating. An example of the process is as follows:

50 PbIn solder was exposed to I(2) vapor at 80 degrees C for 5 minutes and was rinsed in isopropyl alcohol to remove excess iodine. A characteristic brownish-red coating of InI was formed on the solder. Exposure of this sample to 85 degree C/85% RH for 7 days showed minimal corrosion even when extensively contaminated by Cl/-/ions.

No attack of gold, molybdenum or chromium was observed.

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