Microstructure and wear resistance of electrodeposited Ni-SiO2 nano-composite coatings on AZ91HP magnesium alloy substrate

Aluminum matrix composites reinforced with SiC particles (SiCp) were deposited on ZE41 magnesium substrates by laser cladding in order to improve their tribological performance. Silicon and titanium were added to the matrix in order to avoid Al-SiC reactivity. The addition of these elements to avoid Al4C3 formation during the laser cladding fabrication was successfully explored in previous research, but the effect of these elements on the wear behavior and the corrosion resistance of these coatings has not been studied. During the fabrication process, there is dilution with the substrate that forms an Al-Mg matrix, which has an influence on the wear and corrosion behavior. Electrochemical polarization and impedance measurements in a 3.5% NaCl solution and the dry sliding conditions on a pin-on-disc tribometer were used to evaluate the different compositions of Al/SiCp coatings on the ZE41 magnesium alloy and uncoated ZE41. All of the composite coatings had lower wear rates than the substrate. However, the coatings showed worse corrosion behavior than the ZE41 substrate, although the addition of Si or Ti improves the corrosion behavior and the wear resistance.

Download Full-text

Wear Resistance of High Frequency Pulse Electroplating Ni-SiC Nano-Composite Coating

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.465.61 ◽

2012 ◽

Vol 465 ◽

pp. 61-65

Author(s):

Yun Hua Xu ◽

Shi Liang Liu ◽

Xue Wu Liu

Keyword(s):

Wear Resistance ◽

High Frequency ◽

Ph Value ◽

Orthogonal Experiment ◽

Composite Coatings ◽

Wear Test ◽

Optimal Dosage ◽

Nano Composite ◽

Pulse Electroplating ◽

Frequency Pulse

The Ni-SiC nano-composite coatings were prepared on the ring of stainless steel by using of high frequency pulse electroplating. Orthogonal experiment was used to study optimal dosage of the dispersant. The effect of some factors, such as current density, pH value, temperature , addition agent and so on, were studied. The characterization of Ni-SiC nano-composite coatings were studied by wear test. The effect of pulse frequency and the SiC concentration in the electrolyte on the wear resistance of Ni-SiC nano-composite coatings were studied. The morphology of the nano-composite coatings in wear test before and after were analyzed by SEM and the metaloscope photographs. The results show that Ni-SiC nano-composite coatings of high frequency pulse electroforming have better performance of wear resistance.

Download Full-text

A Study on Wear Resistance of the Ni-P-SiC Coating of Magnesium Alloy

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.66-68.1078 ◽

2011 ◽

Vol 66-68 ◽

pp. 1078-1083 ◽

Cited By ~ 4

Author(s):

Xiao Lan Ge ◽

Duo Wei ◽

Cai Jun Wang ◽

Bing Zeng ◽

Zhi Chao Chen

Keyword(s):

Wear Resistance ◽

Magnesium Alloy ◽

Composite Coatings ◽

Homogeneous Distribution ◽

Wear Property ◽

Strengthening Effect ◽

Chemical Plating ◽

Composite Plating ◽

The Common ◽

Microhardness Tester

The Ni-P-SiC composite coatings with homogeneous distribution were prepared through adding nano-SiC grains into the Ni-P chemical plating liquid. The morphology of the composite coatings was analyzed by SEM. The coatings microhardnesses at the SiC composite content for different concentration were measured using the microhardness tester. The wear property of coatings was evaluated by the friction-wear tester and the abrasion mechanism of coatings was also analyzed. The results show that the microstructures of the composite coatings are superior to the common coatings because the nano-SiC particles refine the crystal grains of the composite coatings. The hardness and wear resistance of the composite plating coatings were well improved under the strengthening effect of nano-SiC grains.The wear resistance was the best when the SiC concentration was 4g/L.

Download Full-text

Laser Cladding of Zr55Al10Ni5Cu30/SiC Amorphous Composite Coatings on AZ91D Magnesium Alloy for Improvement of Wear Resistance

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.160-162.450 ◽

2010 ◽

Vol 160-162 ◽

pp. 450-455

Author(s):

Kai Jin Huang ◽

Chao Dong Tan ◽

Chang Rong Zhou

Keyword(s):

Wear Resistance ◽

Magnesium Alloy ◽

Laser Cladding ◽

Composite Coatings ◽

Wear Test ◽

Dry Sliding Wear ◽

Wear Property ◽

X Ray Diffraction ◽

Crystalline Phases ◽

Az91d Magnesium Alloy

To improve the wear property of magnesium alloys, Zr-based amorphous composite coatings have been fabricated on AZ91D magnesium alloy by laser cladding using mixed powders Zr55Al10Ni5Cu30/SiC. The microstructure of the coating was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The wear resistance of the coatings was evaluated under dry sliding wear test condition at room temperature. The results show that the coatings mainly consist of amorphous and different crystalline phases. The coatings exhibit excellent wear resistance due to the recombination action of amorphous and different crystalline phases. The main wear mechanism of the coatings and the AZ91D sample are different, the former is abrasive wear and the latter is adhesive wear.

Download Full-text