Effects of Annealing Below Glass Transition Temperature on the Wettability and Corrosion Performance of Fe-based Amorphous Coatings

doi:10.1007/s40195-021-01228-y

Abstract

Abstract:

This study investigated the effect of annealing below glass transition temperature (T_g) on the microstructural characteristics, mechanical property, wettability, and electrochemical performance of activated combustion-high velocity air fuel (AC-HVAF)-sprayed Fe-Cr-Mo-W-C-B-Y amorphous coatings (ACs). Results showed that Fe-based ACs with a thickness of ~ 300 μm exhibited a fully amorphous structure with low oxidization. Originating from the reduced free volume, sub-T_g annealing increased the thermal stability, hardness, and surface hydrophobicity of Fe-based ACs. The enhanced corrosion resistance of sub-T_g annealed ACs in 3.5 wt% NaCl solution was attributed to the increased surface hydrophobicity and passivation capability. This finding elucidates the correlation between sub-T_g annealing and the properties of Fe-based ACs, which promotes ameliorating ACs with superior performance.

Key words: Activated combustion-high velocity air fuel (AC-HVAF), Amorphous coating, Sub-T _g annealing, Free volume, Wettability, Electrochemical behavior

Dandan Liang, Xiaodi Liu, Yinghao Zhou, Yu Wei, Xianshun Wei, Gang Xu, Jun Shen. Effects of Annealing Below Glass Transition Temperature on the Wettability and Corrosion Performance of Fe-based Amorphous Coatings[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(2): 243-253.

Figures/Tables 15

Fig. 1 a SEM micrograph, b XRD pattern, c DSC curve of Fe43Cr20Mo10W4C15B6Y2 (at.%) amorphous powders

Fig. 2 a Backscattered electron SEM image, b the enlarged morphology of the as-sprayed coating

Table 1 Chemical composition of regions I and II in the as-sprayed coating (at.%)

	Fe	Cr	Mo	W	Y	O
Region I	48.54 ± 2.14	40.71 ± 2.98	0.68 ± 0.08	4.89 ± 0.23	0.05 ± 0.01	3.83 ± 0.17
Region II	56.10 ± 2.83	26.09 ± 0.05	8.49 ± 0.10	4.16 ± 0.09	1.1 ± 0.06	2.08 ± 0.16

Fig. 3 a XRD patterns, b DSC thermograms of the original amorphous coating (O-AC) and the relaxed amorphous coating (R-AC) annealed below Tg

Fig. 4 HRTEM images and SAED patterns (inset) of a O-AC and b R-AC

Fig. 5 a Nanoindentation load-displacement plots, b the calculated Er and H of O-AC and R-AC

Fig. 6 SEM morphologies of the polished a O-AC and b R-AC

Fig. 7 Droplet shapes on the polished surface of a O-AC and b R-AC. Upper inset: the corresponding 3D surface morphologies captured via AFM

Fig. 8 a Potentiodynamic polarization, b EIS test and fitting curves of O-AC and R-AC in 3.5 wt% NaCl solution. The fitting parameters are listed in Table 2

Table 2 Typical electrochemical corrosion parameters of O-AC and R-AC obtained from the potentiodynamic polarization curves

Samples	E_corr (V)	i_corr (10^-6A/cm²)	i_pass (10^-5A/cm²)	E_pit (V)
O-AC	- 0.43 ± 0.01	4.05 ± 0.12	9.13 ± 0.11	0.92 ± 0.00
R-AC	- 0.35 ± 0.02	0.99 ± 0.06	6.49 ± 0.17	0.93 ± 0.01

Fig. 9 Equivalent electrical circuit model to fit into the EIS spectra. M/O and O/S represent metal-oxide film and oxide film-solution interfaces, respectively

Table 3 Fitting parameters of EIS results

Samples	R_s (Ω cm²)	CPE_p (10^-3 S cm^-2sⁿ¹)	n₁	R_p (kΩ cm²)	CPE_dl (10^-3 S cm^-2sⁿ²)	n₂	R_ct (kΩ cm²)
O-AC	10.91 ± 0.42	1.38 ± 0.06	0.62 ± 0.00	0.68 ± 0.05	1.22 ± 0.03	0.46 ± 0.01	5.04 ± 0.17
R-AC	11.39 ± 0.72	1.16 ± 0.03	0.66 ± 0.01	0.97 ± 0.03	1.41 ± 0.04	0.45 ± 0.00	5.70 ± 0.09

Fig. 10 Potentiostatic polarization plots of Fe-based ACs in 3.5 wt% NaCl solution

Fig. 11 a Mott-Schottky plots, b the calculated NA and ND of O-AC and R-AC

Fig. 12 Corroded surface morphologies of a O-AC and c R-AC after the potentiodynamic polarization tests, respectively; b and d the corresponding O element mappings

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