scholarly journals Reinforcing Mechanism of WC Particles in Fe-Based Amorphous Matrix Coating on Magnesium Alloy Surface

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6571
Author(s):  
Haoran Zhang ◽  
Hongyan Wu ◽  
Shanlin Wang ◽  
Yuhua Chen ◽  
Yongde Huang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Composite Coating ◽  
Wear Behavior ◽  
Amorphous Structure ◽  
Alloy Surface ◽  
Amorphous Coating ◽  
Hvof Spraying ◽  
Amorphous Content ◽  
Wear And Corrosion

To protect magnesium alloy surfaces from wear and corrosion, an Fe-based amorphous coating was prepared on WE43 through the Ni60 interlayer by high-velocity oxygen-fuel (HVOF) spraying. The porosity was ~1%, and the amorphous content exceeded 90%. The wear and corrosion resistance of the composite coating with WC particles wrapped in a Ni layer as the reinforcing phase were compared with that of the completely amorphous coating. The friction coefficient (COF) of the composite coating was 0.3, which is only half of that of the WE43 substrate, and the composite coating exhibited a more stable wear behavior than the completely amorphous coating. The corrosion tendency of the composite coating is lower than that of stainless steel, with a corrosion potential of −0.331 V, and the addition of WC particles did not deteriorate the corrosion resistance considerably. The bonding mechanism of the bonding interface between the amorphous structure and the particles of the reinforcing phase was investigated by transmission electron microscopy (TEM). Reinforcing particles were confirmed to form metallurgical bonding with the coating. It was found that the Ni layer showed excellent bonding performance in the form of a mixture that is amorphous and nanocrystalline. Therefore, the Fe-based amorphous composite coating on a magnesium alloy surface shows a potential protective effect.

scholarly journals Construction of Chi(Zn/BMP2)/HA composite coating on AZ31B magnesium alloy surface to improve the corrosion resistance and biocompatibility

2021 ◽  
Vol 10 (1) ◽  
pp. 870-882
Author(s):  
Qiuyang Zhang ◽  
Li Zhang ◽  
Minhui Yang ◽  
Qingxiang Hong ◽  
Zhongmei Yang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Composite Coating ◽  
Magnesium Alloys ◽  
Bone Morphogenetic Protein 2 ◽  
Alloy Surface ◽  
Zinc Ions ◽  
Hexadecanoic Acid ◽  
Az31b Magnesium Alloy ◽  
E Coli

Abstract As biodegradable orthopedic implant materials, magnesium alloys have been attracted enough attentions recently. However, too fast degradation in vivo, limited biocompatibilities, and insufficient antibacterial properties are three main challenges at present. In order to solve these problems, a multifunctional composite coating of Chi(Zn/BMP2)/HA was constructed on AZ31B magnesium alloy surface, successively by the alkali heating treatment, self-assembly of 16-phosphonyl-hexadecanoic acid, in situ immobilization of Chi(Zn/BMP2) (chitosan, zinc ions, and bone morphogenetic protein 2), and the deposition of HA (hydroxyapatite). The results of ATR-FTIR (attenuated total reflection Fourier transform infrared spectrum) spectra and elemental compositions confirmed that 16-phosphonyl-hexadecanoic acid, Chi(Zn/BMP2), and HA were successfully immobilized on the surface. Compared with Mg, Mg-OH, Mg-16, and Mg-Chi(Zn/BMP2), Mg-Chi(Zn/BMP2)/HA with the concave–convex structure surface significantly enhanced the hydrophilicity and corrosion resistance. On the other hand, Mg-Chi(Zn/BMP2)/HA coating also showed excellent biocompatibilities, which not only significantly promoted the osteoblast adhesion and proliferation, but also upregulated ALP and OCN expression of osteoblasts. Furthermore, due to the synergistic antibacterial effect of zinc ions and chitosan, Mg-Chi(Zn/BMP2)/HA showed a good antibacterial property against Escherichia coli (E. coli). Therefore, it can be said that the method used in this work has a good application prospect in improving the corrosion resistance, biocompatibility of magnesium alloys, and inhibiting infections against E. coli.

Wear and Corrosion Properties of 316L-SiC Composite Coating Deposited by Cold Spray on Magnesium Alloy

2017 ◽  
Vol 26 (6) ◽  
pp. 1381-1392 ◽  
Author(s):  
Jie Chen ◽  
Bing Ma ◽  
Guang Liu ◽  
Hui Song ◽  
Jinming Wu ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Composite Coating ◽  
Cold Spray ◽  
Corrosion Properties ◽  
Wear And Corrosion

scholarly journals Fabrication, Wear, and Corrosion Resistance of HVOF Sprayed WC-12Co on ZE41 Magnesium Alloy

Coatings ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 502 ◽  
Author(s):  
Sonia García-Rodríguez ◽  
Antonio Julio López ◽  
Victoria Bonache ◽  
Belén Torres ◽  
Joaquín Rams
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Thermal Spraying ◽  
Electrochemical Corrosion ◽  
High Energy ◽  
Wear And Corrosion ◽  
Wear And Corrosion Resistance ◽  
Oxygen Fuel ◽  
Mass Increase ◽  
Temperature Melting

This study shows that WC-12Co coatings with low porosity and high wear and corrosion resistance can be applied by high velocity oxygen-fuel (HVOF) on a low melting and highly flammable ZE41 magnesium alloy. This provides a novel and promising use of the high-energy thermal spraying technique on low temperature melting substrates. The spraying distance used was 300 mm, which is between two and three times the recommended distanced for HVOF coating with WC-12Co on steels. Despite this, the WC-12Co coatings obtained were homogeneous, crack-free, and dense. The coatings were very well adhered to the substrates and the spraying distance allowed avoiding any thermal affectation of the substrate. The thickness of the coatings was limited to 45 μm to avoid a big mass increase in the samples. The effect of the number of layers, the O2/H2 ratio and the gas transport flow in the coating was studied. The coatings reduced the wear rate of the substrate by 104 times, making them wear resistant. Electrochemical corrosion tests were conducted to study the corrosion protection of the coatings, showing that it is possible to protect the magnesium substrate for 96 h in contact with 3.5 wt.% NaCl aqueous solution.

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