Increasing the wear and corrosion resistance of magnesium alloy (AZ91D) with electrodeposition from eco-friendly copper- and trivalent chromium-plating baths

2010 ◽  
Vol 205 (1) ◽  
pp. 139-145 ◽  
Author(s):  
Ching An Huang ◽  
Che Kuan Lin ◽  
Yu Hu Yeh
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Trivalent Chromium ◽  
Chromium Plating ◽  
Alloy Az91d ◽  
Wear And Corrosion ◽  
Wear And Corrosion Resistance

LASER CLADDING OF MAGNESIUM ALLOY AZ91D WITH SILICON CARBIDE

2009 ◽  
Vol 16 (02) ◽  
pp. 215-221 ◽  
Author(s):  
L. F. CAI ◽  
C. K. MARK ◽  
WEI ZHOU
Keyword(s):  
Silicon Carbide ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Laser Cladding ◽  
Optical Microscope ◽  
Yag Laser ◽  
Alloy Az91d ◽  
Wear And Corrosion ◽  
Structural Applications ◽  
Wear And Corrosion Resistance

Mg alloys are ultralight but their structural applications are often limited by their poor wear and corrosion resistance. The research aimed to address the problem by laser-cladding. Cladding with SiC powder onto surface of AZ91D was carried out using Nd :YAG laser. The laser-clad surface was analyzed using the optical microscope, SEM equipped with EDS, and XRD and found to contain SiC and other Si compounds such as Mg 2 Si and Al 3.21 Si 0.47 as well as much refined α- Mg grains and β- Mg 17 Al 12 intermetallics. The laser-clad surface possesses considerably higher hardness but its corrosion resistance is not improved, indicating that the laser-cladding technique can only be adopted for applications in noncorrosive environments where wear is the predominant problem.

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.

scholarly journals Wear and Corrosion Resistance of Al0.5CoCrCuFeNi High-Entropy Alloy Coating Deposited on AZ91D Magnesium Alloy by Laser Cladding

Entropy ◽  
2018 ◽  
Vol 20 (12) ◽  
pp. 915 ◽  
Author(s):  
Kaijin Huang ◽  
Lin Chen ◽  
Xin Lin ◽  
Haisong Huang ◽  
Shihao Tang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Laser Cladding ◽  
Alloy Coating ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Az91d Magnesium Alloy ◽  
Wear And Corrosion ◽  
Wear And Corrosion Resistance

In order to improve the wear and corrosion resistance of an AZ91D magnesium alloy substrate, an Al0.5CoCrCuFeNi high-entropy alloy coating was successfully prepared on an AZ91D magnesium alloy surface by laser cladding using mixed elemental powders. Optical microscopy (OM), scanning electron microscopy (SEM), and X-ray diffraction were used to characterize the microstructure of the coating. The wear resistance and corrosion resistance of the coating were evaluated by dry sliding wear and potentiodynamic polarization curve test methods, respectively. The results show that the coating was composed of a simple FCC solid solution phase with a microhardness about 3.7 times higher than that of the AZ91D matrix and even higher than that of the same high-entropy alloy prepared by an arc melting method. The coating had better wear resistance than the AZ91D matrix, and the wear rate was about 2.5 times lower than that of the AZ91D matrix. Moreover, the main wear mechanisms of the coating and the AZ91D matrix were different. The former was abrasive wear and the latter was adhesive wear. The corrosion resistance of the coating was also better than that of the AZ91D matrix because the corrosion potential of the former was more positive and the corrosion current was smaller.

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