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ASM Handbook

Aluminum Science and Technology

Edited by
Kevin Anderson, FASM
Kevin Anderson, FASM
Mercury Marine
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John Weritz
John Weritz
Aluminum Association
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J. Gilbert Kaufman, FASM
J. Gilbert Kaufman, FASM
Kaufman Associates
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ASM International
Volume
2A
ISBN electronic:
978-1-62708-207-5
Publication date:
2018
Book Chapter

Chemical and Electrolytic Brightening[1]

By
Mary Oakley
Mary Oakley
Consultant
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Wayne Chandler
Wayne Chandler
SIC Technologies, Inc.
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Published:
2018
Page range:
581 - 585
Publication history
November 22, 2018

Abstract

Chemical brightening (bright dipping) and electrolytic brightening (electropolishing) are essentially selective-dissolution processes, in which the high points of a rough surface of aluminum are attacked more rapidly than the depressions, and the peaks and valleys are smoothed to produce a bright and beautiful finish. This article discusses the metallurgical factors, optical factors, and applications of the chemical and electrolytic brightening. It compares the chemical brightening and electrolytic brightening, and presents the advantages of the chemical and electrolytic brightening processes in terms of performance and economy. The article describes the phosphoric-nitric acid baths and phosphoric-sulfuric acid baths used for chemical brightening. Solution compositions and operating conditions for three commercial electropolishing processes, as well as for suitable post-treatments, are presented in a table.

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Mary Oakley, Wayne Chandler, 2018. "Chemical and Electrolytic Brightening", Aluminum Science and Technology, Kevin Anderson, FASM, John Weritz, J. Gilbert Kaufman, FASM

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