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Nonchromated Substrate Cleaning, Deoxidizing and Conversion Coating Process for Magnetic Disk Manufacturing

IP.com Disclosure Number: IPCOM000050539D
Original Publication Date: 1982-Nov-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Gunder, TM: AUTHOR [+4]

Abstract

A new method has been developed for surface treatment of aluminum ports prior to the application of a coating thereto. Good corrosion resistance and coating adhesion are achieved with a nonchromated immersion cleaning, deoxidizing and conversion coating system. The new method performs at least as well as the earlier chromated system. Three chemicals are used for the purposes for which they were sold by the manufacturers, but at conditions which differ from those recommended in the product technical data sheets. Many commercially available products were tested, and most of these chemicals were found not to perform acceptably for the product. The new system of chemicals was found to be mutually compatible and to perform well as a system.

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Nonchromated Substrate Cleaning, Deoxidizing and Conversion Coating Process for Magnetic Disk Manufacturing

A new method has been developed for surface treatment of aluminum ports prior to the application of a coating thereto. Good corrosion resistance and coating adhesion are achieved with a nonchromated immersion cleaning, deoxidizing and conversion coating system. The new method performs at least as well as the earlier chromated system. Three chemicals are used for the purposes for which they were sold by the manufacturers, but at conditions which differ from those recommended in the product technical data sheets. Many commercially available products were tested, and most of these chemicals were found not to perform acceptably for the product. The new system of chemicals was found to be mutually compatible and to perform well as a system.

The new system is operated in a manner similar to many chemical metal finishing and surface treatment processes. This system consists of Victaclean N, an acidic cleaner manufactured by Stauffer Chemical Company; followed by deionized water rinse; followed by Oakite Deoxidizer LNC, an acid deoxidizer manufactured by Oakite Products, Inc.; followed by deionized water rinse; followed by Alodine 4040, an acid conversion coating manufactured by Amchem Products, Inc.; and followed by deionized water rinse.

Cleaned and conversion-coated aluminum parts must meet stringent cleanliness, corrosion resistance and coating adhesion require...