Effects of W Addition on the Electrochemical Behaviour and Passive Film Properties of Fe-Based Amorphous Alloys in Acetic Acid Solution

doi:10.1007/s40195-018-0791-8

Abstract

Abstract:

The electrochemical behaviour and passive film properties of Fe-Cr-Mo-W-C-B-Y amorphous alloys in acetic acid solution were investigated. The potentiodynamic polarisation and Nyquist curves demonstrated that W addition significantly enhanced the corrosion resistance. Mott-Schottky plots and angle-resolved X-ray photoelectron spectra indicated that passive films with different W contents exhibited dipolar (p-n) semiconducting characteristics separated by flat-band potentials. The outer and inner oxide layers of the passive films were modified by reducing the acceptor and donor densities. Moreover, W addition favoured the formation of a thicker and more stable passive film to inhibit the dissolution of alloy elements.

Key words: Amorphous alloy, XPS, Mott-Schottky measurement, Passive film, Semiconducting property, Chemical ingredient

Dan-Dan Liang, Xian-Shun Wei, Chun-Tao Chang, Jia-Wei Li, Yong Wang, Xin-Min Wang, Jun Shen. Effects of W Addition on the Electrochemical Behaviour and Passive Film Properties of Fe-Based Amorphous Alloys in Acetic Acid Solution[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(10): 1098-1108.

Figures/Tables 14

Fig. 1 Scheme of angle-resolved XPS [30]

Fig. 2 a XRD patterns; b DSC curves of Fe47-xCr20Mo10WxC15B6Y2 (x?=?0, 2, 4, 6 at.%) melt ribbons

Fig. 3 a Potentiodynamic polarisation; b Nyquist curves (inset: the equivalent circuit, RsRcQ) of Fe47-xCr20Mo10WxC15B6Y2 (x?=?0, 2, 4, 6 at.%) amorphous alloys in 1 mol/L acetic acid solution

Table 1 Electrochemical parameters of Fe47-xCr20Mo10WxC15B6Y2 (x?=?0, 2, 4, 6 at.%) amorphous alloys in 1 mol/L acetic acid solution

W addition (at.%)	E_corr (V)	i_corr (μA/cm²)	i_pass (μA/cm²)	R_c (kΩ cm²)
x?=?0	-?0.13?±?0.04	0.20?±?0.06	2.70?±?0.27	188.55?±?11.10
x?=?2	-?0.07?±?0.03	0.17?±?0.04	1.97?±?0.16	483.50?±?14.57
x?=?4	-?0.04?±?0.05	0.12?±?0.03	1.60?±?0.11	729.35?±?36.42
x?=?6	-?0.01?±?0.02	0.11?±?0.02	1.22?±?0.13	960.15?±?30.90

Fig. 4 Correlation between capacitance and frequency of the passivated Fe47-xCr20Mo10WxC15B6Y2 (x?=?0, 2, 4, 6 at.%) ribbon specimens after immersion in 1 mol/L acetic acid solution at the OCP for 120 h

Fig. 5 Mott-Schottky plots of passive films formed on different W-containing Fe-based amorphous alloys after immersion in 1 mol/L acetic acid solution for 120 h at a measurement frequency of 103 Hz

Table 2 $\overline{{E_{\text{FB}} }}$, NA, and ND of passive films calculated from the Mott-Schottky plots

W addition (at.%)	$\overline{{E_{\text{FB}} }}$ (V)	N_A (10¹⁸ cm^-3)	N_D (10¹⁸ cm^-3)
x?=?0	0.54?±?0.01	3.38?±?0.23	4.29?±?0.11
x?=?2	0.56?±?0.01	1.39?±?0.21	1.34?±?0.13
x?=?4	0.60?±?0.04	0.60?±?0.07	1.01?±?0.01
x?=?6	0.62?±?0.01	0.47?±?0.01	0.44?±?0.14

Fig. 6 XPS spectra of the passive films on Fe47Cr20Mo10C15B6Y2 and Fe41Cr20Mo10W6C15B6Y2 amorphous alloys formed in 1 mol/L acetic acid solution for 120 h at the emission angle of 45°

Fig. 7XPS spectra separated using asymmetric Gaussian-Lorentzian mixed curve fitting of passive films formed on Fe47-xCr20Mo10WxC15B6Y2 amorphous alloys immersed in 1 mol/L acetic acid solution for 120 h at the emission angle of 45°: a x?=?0 at.%, Fe 2p; b x?=?6 at.%, Fe 2p; c x?=?0 at.%, Cr 2p; d x?=?6 at.%, Cr 2p; e x?=?0 at.%, Mo 3d; f x?=?6 at.%, Mo 3d; g x?=?6 at.%, W 4f

Table 3 Ionisation contribution for each constituent in Fe47-xCr20Mo10WxC15B6Y2 (x?=?0 and 6 at.%) amorphous alloys at the emission angle of 45°

Ionised contribution (area%)		W addition (at.%)
Ionised contribution (area%)		x?=?0	x?=?6
Fe	Fe⁰	30.26?±?0.33	15.23?±?0.16
	Fe²⁺	47.36?±?0.51	2.86?±?0.03
	Fe³⁺	22.38?±?0.24	81.91?±?0.86
Cr	Cr⁰	10.29?±?0.84	1.14?±?0.01
	Cr³⁺	74.21?±?6.08	87.94?±?0.91
	Cr⁶⁺	15.50?±?1.27	10.62?±?0.11
Mo	Mo⁰	36.24?±?0.36	32.50?±?3.04
	Mo⁴⁺	36.53?±?0.37	37.56?±?2.43
	Mo⁶⁺	27.23?±?0.27	29.94?±?2.44
W	W⁰	-	30.17?±?0.33
	W⁴⁺	-	18.50?±?0.20
	W⁶⁺	-	51.33?±?0.56

Fig. 8 XPS spectra of the passive film for Fe-based amorphous alloys at varied emission angles: a x?=?0 at.%, Fe 2p; b x?=?6 at.%, Fe 2p; c x?=?0 at.%, Cr 2p; d x?=?6 at.%, Cr 2p; e x?=?0 at.%, Mo 3d; f x?=?6 at.%, Mo 3d; g x?=?6 at.%, W 4f

Table 4 Oxide layer thickness of passive films formed on W-containing Fe-based amorphous alloys

W addition (at.%)	Oxide layer thickness (nm)
W addition (at.%)	Fe oxide layer	Cr oxide layer	Mo oxide layer	W oxide layer
x?=?0	1.56?±?0.02	3.82?±?0.07	2.51?±?0.03	-
x?=?6	2.35?±?0.09	6.25?±?0.02	2.49?±?0.07	2.61?±?0.07

Fig. 9 Valence electron bands of the passive films formed on Fe47-xCr20Mo10WxC15B6Y2 (x?=?0 and 6 at.%) amorphous alloys at varied emission angles

Fig. 10 Duplex membrane model of the passive film formed on Fe-Cr-Mo-W-C-B-Y amorphous alloys immersed in 1 mol/L acetic acid solution for 120 h

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