Effect of Alternating Electric Field on Diffusion Coefficient of Oxygen in Thin Electrolyte Layer

doi:10.11902/1005.4537.2014.233

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (6): 549-555 DOI: 10.11902/1005.4537.2014.233

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Effect of Alternating Electric Field on Diffusion Coefficient of Oxygen in Thin Electrolyte Layer

Qimeng CHEN¹,Junxi ZHANG¹(

),Xujie YUAN^1,²,Nianwei DAI¹

1. Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
2. China Classification Society-Det Norske Veritas Technology Institute, Shanghai 210417, China

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Abstract

Effect of an applied alternating electric field on the oxygen diffusion coefficient in thin electrolyte layers on an electrode of stainless steel was investigated by chronoamperometry. The results show that the oxygen diffusion coefficient increased with the decrease in TEL thickness, as well as the increase in AEF strength. The effect of AEF on the oxygen diffusion coefficient is found to be due to that the migration of oxygen form the gas/liquid interface to electrode surface was accelerated by the applied electric field. For a thinner electrolyte layer by a stronger applied electric field, the cathodic process of the electrode would be more intensive,which corresponds to higher corrosion rate of metal.

Key words: chronoamperometry atmospheric corrosion oxygen reduction kinetic parameter thin electrolyte layer

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	Qimeng CHEN
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Cite this article:

Qimeng CHEN,Junxi ZHANG,Xujie YUAN,Nianwei DAI. Effect of Alternating Electric Field on Diffusion Coefficient of Oxygen in Thin Electrolyte Layer. Journal of Chinese Society for Corrosion and protection, 2015, 35(6): 549-555.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.233 OR https://www.jcscp.org/EN/Y2015/V35/I6/549

Fig.1 Schematic diagrams of the experiment arrangement for TELs corrosion tests under external electric field: (a) transverse cross-sectional view, (b) top view of electrochemical cell

Fig.2 Cathodic polarization curves of Pt in 0.35%NaCl TEL with various thicknesses under absent alternating electric field

Fig.3 Transient curves (a) and plots of 1/[i_F(t )]² vs time (b) of Pt in 0.35%NaCl TEL with various thicknes-sses under absent alternating electric field

Fig.4 Plots of Δ{1/[i_F(t )]²}/Δt vs time for Pt in 0.35%NaCl TEL with various thicknesses under absent alternating electric field

Fig.5 Changes of D/D₀ with thickness of 0.35%NaCl TEL under different alternating electric fields

Fig.6 Changes of D/D₀ with alternating electric field intensity for O in 0.35%NaCl TEL with different thicknesses

Fig.7 Plots of Δ{1/[i_F(t )]²}/Δt vs time for 0.35%NaCl TEL with various thicknesses under alternating electric field of 100 kV/m (a), 200 kV/m (b) and 400 kV/m (c)

Fig.8 Models of electric double layers without (a) andwith (b) applications of alternating electric field

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