Anti-Corrosion and Tribo-Mechanical Properties of Co-deposited Zn-SnO2 Composite Coating

doi:10.1007/s40195-015-0228-6

Abstract

Abstract:

Zn-SnO₂ composite coatings were prepared by direct potential using electrolytic co-deposition technique from sulfate solution. The effect of Zn²⁺ and SnO₂ concentrations in deposited bath on the mechanical properties and morphological characteristics of the composite coatings were examined. The characterizations of the sample were analyzed using scanning electron microscopy couple with energy dispersive spectroscopy (SEM/EDS), X-ray diffraction (XRD) and atomic force microscopy (AFM). The electrochemical degradation behavior of the samples in 3.65 wt.% NaCl solution was studied using potentiodynamic polarization technique and characterized by high-resolution optical microscope. From all the fabricated composite coatings, obvious diffraction peaks were observed with Zn-7Sn-S-0.3V film with Zn₂Sn₇, Sn, Zn₂Sn₅ and Zn phases, confirming the presence and formation of Zn-SnO₂ coating. The XRD pattern shows that the presences of SnO₂ particle remarkably play a major role in the precipitation and orientation of the alloy matrix. From the SEM/EDS and AFM results, the deposits show that composite particle and proper bath composition have strong influence on the microstructure. An enhanced corrosion resistance was attained as a result of the induced particles.

Key words: Metal matrix composite, Co-deposition, Mechanical property, Corrosion resistance

Ojo Sunday Isaac Fayomi, Abimbola Patricia Idowu Popoola. Anti-Corrosion and Tribo-Mechanical Properties of Co-deposited Zn-SnO₂ Composite Coating[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(4): 521-530.

Figures/Tables 19

Table 1 Processing parameters for different samples

Material sample	Time of deposition (min)	Stirring rate (r/min)	Potential (V)	Current density (A/cm²)	SnO₂ additive (g/L)
Zn-7SnO₂-0.3V	20	200	0.3	2	7
Zn-7SnO₂-0.5V	20	200	0.5	2	7
Zn-13SnO₂-0.3V	20	200	0.3	2	13
Zn-13SnO₂-0.5V	20	200	0.5	2	13

Fig. 1 AFM images of the Zn-7SnO2-0.3 V layer: a 2D image; b 3D relief image; c roughness analysis

Fig. 2 AFM images of the Zn-13SnO2-0.3V layer: a 2D image; b 3D relief image; c roughness analysis

Fig. 3 XRD pattern for Zn-7SnO2-0.3V coating

Fig. 4 XRD pattern for Zn-13SnO2-0.5V coating

Fig. 5 Raman spectrum for Zn-7SnO2-0.3V coating

Fig. 6 SEM image and EDS result of Zn-7SnO2-0.3V coating

Fig. 7 SEM image and EDS result of Zn-13SnO2-0.5V coating

Fig. 8 SEM images of Zn-7SnO2-0.3V a, Zn-13SnO2-0.5V b

Fig. 9 Micro-hardness for Zn-SnO2 composite coatings

Fig. 10 Wear rate of mild steel and Zn-Sn-S coatings

Fig. 11 Variation of friction co-efficient against time for Zn-7SnO2-0.3V coating and the mild steel substrate

Fig. 12 Variation of friction co-efficient against sliding velocity for Zn-7SnO2-0.3V coating and mild steel substrate

Fig. 13 SEM image of the wear scar of the mild steel substrate

Fig. 14 Micrographs of the wear scars of Zn-7SnO2-0.5V a, Zn-13SnO2-0.5V b coatings

Fig. 15 Potentiodynamic polarization curves for Zn-SnO2 coatings and mild steel

Table 2 Summary of the potentiodynamic polarization results of Zn-SnO2 coating and mild steel

Sample	I _corr (A)	i _corr (A/cm²)	R _P (Ω)	E _corr (V)	V _corr (mm/year)
Mild steel	2.04 × 10^-3	7.04 × 10^-2	27.600	-1.53900	4.1
Zn-7SnO₂-0.3V	1.87 × 10^-5	1.87 × 10^-5	564.93	-1.09955	0.007786
Zn-7SnO₂-0.5V	1.92 × 10^-5	1.92 × 10^-5	446.02	-1.12122	0.007995
Zn-13SnO₂-0.3V	2.17 × 10^-5	2.17 × 10^-5	406.13	-1.11633	0.009060
Zn-13SnO₂-0.5V	5.44 × 10^-5	5.44 × 10^-5	77.653	-1.13342	0.022678

Fig. 16 AFM images of the Zn-7SnO2-0.3V coating surface after corrosion: a 2D image; b 3D relief image; c roughness analysis

Fig. 17 Morphologies of corroded surface of Zn-7SnO2-0.3V a, Zn-13SnO2-0.5V b coatings

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Anti-Corrosion and Tribo-Mechanical Properties of Co-deposited Zn-SnO₂ Composite Coating

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