Izvorni znanstveni članak
https://doi.org/10.5599/jese.2011.0004
External control of anodic dissolution mechanisms of 100Cr6 in nitrate/chloride mixed electrolytes
Andreas Lesch
; Department of Pure and Applied Chemistry, CIS - Center of Interface Science, Faculty of Mathematics and Natural Sciences, Carl von Ossietzky University of Oldenburg, Germany
Gunther Wittstock
orcid.org/0000-0002-6884-5515
; Department of Pure and Applied Chemistry, CIS - Center of Interface Science, Faculty of Mathematics and Natural Sciences, Carl von Ossietzky University of Oldenburg, Germany
Chris Burger
; Robert Bosch GmbH, Stuttgart, Germany
Benjamin Walther
; Robert Bosch GmbH, Stuttgart, Germany
Jurgen Hackenberg
; Robert Bosch GmbH, Stuttgart, Germany
Sažetak
The anodic dissolution of 100Cr6 steel in neutral electrolytes containing sodium chloride and sodium nitrate was investigated potentiodynamically and galvanodynamically with a rotating disc electrode at room temperature. The total concentration of the mixed electrolyte was 3 mol L-1 with variation of chloride/nitrate mole ratios. The potentiodynamic linear sweep voltammograms (LSVs) in mixed electrolytes are similar to the LSVs in pure chloride electrolyte at lower current densities and switch to behaviour observed in pure nitrate electrolytes at higher current densities. Provided that both anions are present, it seems that the dissolution reactions at the steel anode are determined by the interface layer only. The effect of these layers on surface quality and current efficiency was also investigated in a flow channel applying galvanostatic pulses. An evidence for different dissolution mechanisms can be seen with an important influence of duty cycle and flow conditions. This allows external control of the desired dissolution mechanism in mixed electrolytes.
Ključne riječi
Electrochemical machining; Mixed electrolyte; Anodic dissolution; Rotating disc electrode; Flow channel; Galvanostatic pulses
Hrčak ID:
86966
URI
Datum izdavanja:
20.8.2011.
Posjeta: 1.130 *