Study on Corrosion Resistance and Wear Resistance of Zn–Al–Mg/ZnO Composite Coating Prepared by Cold Spraying
Abstract
:1. Introduction
1.1. Cold Spray Technology Features
1.2. Cold Spray Coating on the Surface of Marine Equipment
2. Experimental Methods
2.1. Preparation of Coating
2.2. Coating Characteristics
2.3. Corrosion Behavior of the Composite Coatings
2.4. Photocatalytic Characteristics of the Composite Coatings
2.5. Composite Coating Friction and Wear Test
3. Results and Discussion
3.1. Preparation of Composite Coatings
3.2. Composite Coating Morphology
3.3. Corrosion Resistance Test
3.3.1. Electrochemical Accelerated Corrosion Test
3.3.2. Neutral Salt Spray Test of Composite Coating
3.4. Photocatalytic Degradation of Methyl Blue
3.5. Friction and Wear Test of Composite Coatings
4. Conclusions
- Zn65Al15Mg5ZnO15 composite coating and Zn45Al35Mg5ZnO15 composite coating can be prepared on base steel Q235 by cold spray technique. The surface of the Zn45Al35Mg5ZnO15 composite coating is smoother and flatter than the Zn65Al15Mg5ZnO15 composite coating. The micromorphology of the two composite coatings prepared by cold spraying is dense, there are no defects such as voids inside the coating, and the Zn, Al, Mg, and ZnO elements inside the coating are uniformly distributed.
- The analysis of electrochemical workstation test data shows that both the Zn65Al15Mg5ZnO15 and Zn45Al35Mg5ZnO15 composite coatings have strong anodic oxidation cathodic protection characteristics, which can protect the matrix steel Q235 from corrosion. The open circuit potential and polarization current of the two composite coatings at different time periods show that the corrosion rate of the Zn65Al15Mg5ZnO15 composite coating is higher than that of the Zn45Al35Mg5ZnO15 composite coating, and the corrosion products produced by the oxidation of the composite coating have corrosion slowing characteristics during corrosion.
- The neutral salt spray test of the two composite coatings shows that the Zn45Al35Mg5ZnO15 composite coating experienced regular delamination corrosion with no pits or cracks defects but the Zn65Al15Mg5ZnO15 composite coating was unevenly corroded and had a deep corrosion, with defects such as pits and cracks, after 240 h of corrosion. The corrosion resistance test shows that the Zn45Al35Mg5ZnO15 composite coating has a better corrosion resistance and long-term stability than the Zn65Al15Mg5ZnO15 composite coating.
- By comparing the photocatalytic degradation data of the Zn65Al15Mg5ZnO15 composite coatings, Zn45Al35Mg5ZnO15 composite coatings, and Q235 matrix steel for methyl blue solution, the results show that the two composite coatings have good photocatalytic properties but that the photocatalytic properties of the Zn45Al35Mg5ZnO15 composite coatings are better.
- The results of the friction and wear tests show that both the Zn65Al15Mg5ZnO15 composite coating and the Zn45Al35Mg5ZnO15 composite coating have better friction and wear resistance than the base steel Q235 and that the friction and wear properties of the Zn45Al35Mg5ZnO15 composite coating are the best.
- The results of all the above experiments show that the Zn45Al35Mg5ZnO15 composite coating prepared by cold spraying has a superior deposition effect, high photocatalytic efficiency, better corrosion resistance, and wear resistance.
Author Contributions
Funding
Conflicts of Interest
References
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Samples | Times/h | Ecorr (V) | Icorr (A·cm−2) |
---|---|---|---|
Q235 | 1 | −0.95 ± 0.02 | 6.58 × 10−4 |
Zn45Al35Mg5ZnO15 | 1 | −1.22 ± 0.02 | 2.11 × 10−5 |
120 | −1.42 ± 0.02 | 1.08 × 10−5 | |
360 | −1.27 ± 0.02 | 1.28 × 10−4 | |
480 | −1.20 ± 0.02 | 8.23 × 10−5 | |
Zn65Al15Mg5ZnO15 | 1 | −1.41 ± 0.02 | 3.03 × 10−5 |
120 | −1.50 ± 0.02 | 1.63 × 10−5 | |
360 | −1.32 ± 0.02 | 3.54 × 10−4 | |
480 | −1.40 ± 0.02 | 1.08 × 10−4 |
Samples | Methyl Blue Absorbance | Methyl Blue Degradation Solution |
---|---|---|
Zn45Al35Mg5ZnO15 | | |
Zn65Al15Mg5ZnO15 | | |
Q235 | | |
Samples | m1 (g) | m2 (g) | Δm (g) | f |
---|---|---|---|---|
Zn45Al35Mg5ZnO15 | 2.6735 | 2.6700 | 0.0035 | 0.181 |
Zn65Al15Mg5ZnO15 | 2.6420 | 2.6370 | 0.0050 | 0.231 |
Q235 | 1.7734 | 1.7623 | 0.0111 | 0.358 |
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Lu, X.; Wang, S.; Xiong, T.; Wen, D.; Wang, G.; Du, H. Study on Corrosion Resistance and Wear Resistance of Zn–Al–Mg/ZnO Composite Coating Prepared by Cold Spraying. Coatings 2019, 9, 505. https://doi.org/10.3390/coatings9080505
Lu X, Wang S, Xiong T, Wen D, Wang G, Du H. Study on Corrosion Resistance and Wear Resistance of Zn–Al–Mg/ZnO Composite Coating Prepared by Cold Spraying. Coatings. 2019; 9(8):505. https://doi.org/10.3390/coatings9080505
Chicago/Turabian StyleLu, Xinqiang, Shouren Wang, Tianying Xiong, Daosheng Wen, Gaoqi Wang, and Hao Du. 2019. "Study on Corrosion Resistance and Wear Resistance of Zn–Al–Mg/ZnO Composite Coating Prepared by Cold Spraying" Coatings 9, no. 8: 505. https://doi.org/10.3390/coatings9080505