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ID 30480
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title alternative
High-Efficient and High-Speed Chromium Deposition in a Formic Acid Bath I. Static and Rotating Specimens
creator
Komoda, Shinichiro
Matsumura, Masanobu
subject
Chromium
High Current Efficiency
High Speed Deposition
Formic Acid Bath
Aging Time
NDC
Metal and mining engineering
abstract
A defect associated with the use of a Sargent bath, a widely used chromium plating device, is the substantially lower current efficiency of chromium compared to that of other metals. It has been reported that the use of a formic acid bath leads to the production of amorphous-structured chromium deposits with a higher current efficiency. However, it is difficult to use this process commercially, because of difficulties involved in maintaining the bath. The purpose of this study was to examine in detail the conditions for chromium deposition in a formic acid bath with the objective of developing an optimum plating method with a higher current efficiency and a higher deposition rate. In order to realize a higher deposition rate, the effect of agitating the solution, via the use of a rotating disk electrode (RDE) apparatus, was examined. The findings show that the rate of deposition and current efficiency increased with increasing current density. By rotating the specimen, however, plating with bright surfaces was obtained more easily and under a wide variaty of plating conditions. The appearance of the surface of the deposited chromium was affected by the current density, the aging time of the solution used, and the rotating speed. We conclude that the morphology of the deposited chromium is closely related to the Cr3+ concentration in the proximity of the surface of the specimen.
journal title
表面技術
volume
Volume 55
issue
Issue 1
start page
65
end page
70
date of issued
2004-01-01
publisher
表面技術協会
issn
0915-1869
ncid
publisher doi
language
jpn
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2005 (社)表面技術協会
本文データは学協会の許諾に基づきJ-STAGEから複製したものである
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department
Graduate School of Engineering