期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 657, 期 1-2, 页码 46-53出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2011.03.009
关键词
Thermal spraying; Electron transfer kinetics; Ultramicroelectrode; Superalloy; SECM
资金
- University of Nottingham
- EPSRC [EP/D501229/1]
- Engineering and Physical Sciences Research Council [EP/D501229/1] Funding Source: researchfish
- EPSRC [EP/D501229/1] Funding Source: UKRI
The effect of thermal spraying on the electrochemical activity of an anti-corrosion superalloy was studied quantitatively using scanning electrochemical microscopy (SECM). The superalloy used was Inconel 625 (a Ni base superalloy) and thin coatings of the alloy were formed on mild steel using high velocity oxy-fuel (HVOF) thermal spraying. The kinetics of electron transfer (ET) across the Inconel 625 coating/electrolyte interface were studied using SECM using ferrocenemethanol as the redox mediator. For comparison, the kinetics of ET across stainless steel/electrolyte and bulk wrought Inconel 625/electrolyte interfaces were also studied using SECM. The standard heterogeneous ET rate constant, k degrees, for ferrocenemethanol reduction at stainless steel was 1.0 +/- 0.5 x 10(-3) cm s(-1), compared to 2.6 +/- 1.8 x 10(-2) cm s(-1) at the wrought Inconel 625 surface. However, at the HVOF-sprayed Inconel 625 surface, the kinetics of ET varied across the surface and k degrees for ferrocenemethanol reduction ranged between similar to 2.2 x 10(-4) cm s(-1) and similar to 2.6 x 10(-3) cm s(-1). These results clearly demonstrate that SECM can be used to quantify the effect of thermal spraying on the electrochemical properties of Inconel 625 and that thermal spraying results in an electrochemically-heterogeneous surface. (C) 2011 Elsevier B.V. All rights reserved.
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