Tribological and Corrosion Properties of the CoCrAlYTaSiC-xCNTs Coatings Deposited by Laser Cladding

doi:10.1007/s40195-024-01662-8

Abstract

Abstract:

The MCrAlY coating has been potential candidate for the parts applied in friction and corrosion conditions, and CNTs (carbon nanotubes) are expected to improve the service performance of coatings owing to high lubrication and low chemical reactivity. In this work, a systematic investigation on the tribological and corrosion properties of CoCrAlYTaSiC-xCNTs coatings deposited by laser melting was analyzed. Results showed that the coatings had good-quality without typical metallurgical defects. The CNTs addition homogenized and refined the microstructure of coating, and also improved the tribological and corrosion properties. As the CNTs content changed from 0 to 4 wt%, the wear rate of coating decreased from 16.23 × 10^-3 to 7.58 × 10^-3 mg m⁻¹, the j_corr of coating decreased from 4.13 × 10^-4 to 1.23 × 10^-4 A cm⁻², and the R_ct values increased from 12.69 to 25.07 Ω cm².

Key words: MCrAlY coating, Laser melting deposition, Friction, Electrochemical corrosion

Hai Zhao, Yi Ding, Wei Gao, Bo Yu, Jinghui Li, Mingya Zhang. Tribological and Corrosion Properties of the CoCrAlYTaSiC-xCNTs Coatings Deposited by Laser Cladding[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(4): 726-738.

Figures/Tables 14

Table 1 Chemical composition of experimental material CoCrAlYTaSiC power (wt%)

Co	Cr	Al	Ta	Y	Si	C
40.05	40.31	11.02	4.93	0.44	1.15	2.10

Fig. 1 X-ray diffraction patterns of the CoCrAlYTaSiC-xCNTs powders a and coatings b

Fig. 2 SEM morphologies of pure CoCrAlYTaSiC powder a, b and CoCrAlYTaSiC-4wt% CNTs balled powder c, d

Fig. 3 SEM images of CoCrAlYTaSiC-xCNTs composite coatings: a C0 coating; b C1 coating; c C2 coating; d C4 coating

Fig. 4 Bright-field transmission electron microscopy micrographs a and b and corresponding selected area diffraction patterns (SADPs) of various phases in the C4 coating c-f

Fig. 5 Hardness a, wear rare b, and friction coefficient c of the CoCrAlYTaSiC-xCNTs composite coatings

Fig. 6 3D and 2D profiles of the CoCrAlYTaSiC-xCNTs composite coatings against the GCr15 steel at the load of 196 N for 600 m: a C0 coating; b C1 coating; c C2 coating; d C4 coating

Fig. 7 Wear features of the CoCrAlYTaSiC-xCNTs composite coatings against the GCr15 steel at the load of 196 N for 600 m: a and b C0 coating; c and d C1 coating; e and f C2 coating; g and h C4 coating

Fig. 8 Polarization curves of the CoCrAlYTaSiC-xCNTs coatings in 0.5 mol H2SO4 for 1 h

Table 2 Electrochemical corrosion parameters of the coatings soaked in 0.5 mol H2SO4 solution

Coatings	E_corr (V)	R_p (Ω)	i_p × 10^-5 (μA cm²)	β_c	β_a	j_corr × 10^-4 (μA cm²)
C0	− 0.328	33	7.17	7.598	3.831	4.13
C1	− 0.318	45	7.39	8.685	1.354	3.76
C2	− 0.301	56	1.43	8.702	4.323	2.51
C4	− 0.334	75	1.67	8.874	1.546	1.23

Fig. 9 Impedance spectra of CoCrAlYTaSiC-xCNTs coatings: a Nyquist plot; b and c Bode diagrams; d Equivalent circuit diagram

Table 3 Electrochemical corrosion parameters of the coatings in 0.5 mol H2SO4 solution (EIS fitting data)

Coatings	R_s (Ω cm²)	CPE₁ (mΩ⁻¹ cm⁻² S⁻ⁿ)	n	R_ct (Ω cm²)	CPE (mΩ⁻¹ cm⁻² S^-ⁿ)	R_f (Ω cm²)
C0	1.647	2.976	0.984	12.69	8.574	55.66
C1	1.689	2.264	0.984	18.02	1.948	175.4
C2	1.716	3.314	0.978	19.18	3.157	214.4
C4	1.798	1.365	0.991	25.07	8.359	70.89

Fig. 10 Surface SEM morphologies of coatings after electrochemical corrosion: a and b C0 coating; c and d C1 coating; e and f C2 coating; g and h C4 coating

Fig. 11 EPMA results of the I, II, and III regions in Fig. 10

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