Effect Of Acid Pretreatment Of The Plated
Substrate On The Hardness Of The Carbon Plating
Film Formed By Using A Molten Salt
Electrochemical Process
Author(s)
K. Tanaka, Y. Okumura, H. Kurooka, T. Katayama,
A. Yukawa & Y. Ueda
Abstract
Diamond-like carbon (DLC) has excellent features in low friction and wear
resistance, so its application is expanding rapidly as surface treatment of the
sliding elements of automotive machine parts. In recent years, pollutionprevention
has been drawing attention, and for this purpose, the use of
lubricating oil has been drastically reduced and low friction surface treatment has
become popular in industry. In order to overcome the drawbacks of DLC, such
as expensive film and time consuming processes, carbon film plating technology
has been developed by using the molten salt electrochemical process. Although
the formation of carbon film on stainless steel substrate and the influence on the
morphology of the film in electrolytic condition is becoming clear,
the deposition of the carbon film using molten salt electrochemical process
has the problem of poor adhesion between the substrate and the film in the
present situation. In this paper, the effect of pretreatment of acid on the substrate
by using a molten salt electrochemical process was investigated. A very smooth
surface was obtained by rinsing with hydrochloric acid compared with sulfuric
acid in the pretreatment process. When the substrate was pretreated with
hydrochloric acid, a carbon film having a high film hardness and high density
was obtained.
Keywords: carbon film, molten salt electrochemical process, pretreatment, PR
electrolysis, hydrochloric acid, sulfuric acid.
Keywords
carbon film, molten salt electrochemical process, pretreatment, PR
electrolysis, hydrochloric acid, sulfuric acid.
Related Book
Other papers in this volume
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