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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.49  No.6 (2008)  >  pp.1346-1354

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Electrochemical Iron-Chromium Alloying of Carbon Steel Surface Using Alternating Pulsed Electrolysis

Shunsuke Yagi1), Hiroki Oshima2), Kuniaki Murase1), Eiichiro Matsubara1) and Yasuhiro Awakura1)
1) Department of Materials Science and Engineering, Kyoto University
2) Department of Materials Engineering, The University of Tokyo

Alternating pulsed electrolysis was investigated for the surface modification of carbon steel substrates with carbon contents of 0.2 mass%, 0.6 mass% and 0.8 mass%. This process involves the anodic periodic dissolution of substrates to provide ferrous or ferric ions near the substrate as an electroactive component to form the objective alloy during subsequent cathodic times. The carbon steel substrates dissolved heterogeneously since the substrates had nonuniform texture composed of ferrite, cementite, and pearlite. Although the heterogeneous dissolution tended to provide a rough surface of the iron-chromium alloy layers, which resulted in poor adhesion of the layers, relatively flat and smooth alloy layers were obtained by reducing the amount of dissolved iron during each anodic pulse. Pits and defects that were originally recognized on the carbon steel substrate were gradually filled in and covered with iron-chromium alloy by the pulsed electrolysis.

surface modification, carbon steel, iron-chromium alloying, alternating pulsed electrolysis

Received: January 21, 2008
Accepted: March 12, 2008 , Published online: May 25, 2008
Copyright (c) 2008 The Japan Institute of Metals



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