Browse Prior Art Database

Treating Articles with Liquids

IP.com Disclosure Number: IPCOM000092329D
Original Publication Date: 1967-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Mansbridge, DS: AUTHOR

Abstract

A process and an apparatus are provided for uniformly etching thin layers of chromium. The apparatus comprises vat 1 containing a quantity of trichloroethylene 2, and electrolyte 3 which floats on trichloroethylene 2 and stainless steel cathode 4 in contact with electrolyte 3. The electrolyte includes: Sodium hydroxide 43 grams/liter Sodium carbonate 56 grams/liter Water 1 liter.

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Treating Articles with Liquids

A process and an apparatus are provided for uniformly etching thin layers of chromium. The apparatus comprises vat 1 containing a quantity of trichloroethylene 2, and electrolyte 3 which floats on trichloroethylene 2 and stainless steel cathode 4 in contact with electrolyte 3. The electrolyte includes: Sodium hydroxide 43 grams/liter

Sodium carbonate 56 grams/liter

Water 1 liter.

An electrical connection is made between chromium layer 5 at one end 6 of article 7 and the positive side of a DC voltage supply. Article 7 is then lowered into electrolyte 3 at a uniform speed so that the end opposite to end 6 enters into the electrolyte first. When the whole of article 7 is lowered through electrolyte 3 into trichloroethylene 2, the power supply is switched off. Article 7 is then removed, washed, and dried.

While electrolyte 3 is active in the etching process, trichloroethylene 2 is inert and serves merely as a support for electrolyte 3. Other inert relatively dense liquids which do not mix with the electrolyte, such as trichlorotrifluoroethane or glycerol, are useable as the inert layers.

The process of using an active liquid and an inactive liquid is also applicable to electropolishing techniques.

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