SKIN AND BULK CORROSION PROPERTIES OF DIE CAST AND THIXOCAST AZ91D MAGNESIUM ALLOY IN 0.05M NaCl SOLUTION

Abstract Compound extrusion (CE) is a newly developed plastic deformation technique which combines direct extrusion (DE) with a two-pass equal channel angular extrusion (ECAE). This paper focuses on the strength, ductility and anti-corrosion properties of an NaCl solution at certain concentrations and the wear-resistance of dry sliding AZ61 magnesium alloy prepared by CE and DE. It is found that the strength and elongation of the AZ61 alloy prepared by CE are enhanced because of grain refinement. Furthermore, AZ61 magnesium alloy made by CE displays higher corrosion and wear resistance than that prepared by DE. Experimental results prove that CE is a prospective manufacturing method for improving the mechanical properties, anti-corrosion and anti-wear of AZ61 magnesium alloy.

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Transformation between localized and general corrosion behavior of die‐cast AZ91D magnesium alloy in 3.5 wt% NaCl aqueous solutions

Materials and Corrosion ◽

10.1002/maco.201911183 ◽

2019 ◽

Vol 70 (12) ◽

pp. 2303-2310 ◽

Cited By ~ 3

Author(s):

Shaohua Zhang ◽

Lifeng Hou ◽

Huayun Du ◽

Huan Wei ◽

Baosheng Liu ◽

...

Keyword(s):

Magnesium Alloy ◽

Aqueous Solutions ◽

Corrosion Behavior ◽

General Corrosion ◽

Az91d Magnesium Alloy ◽

Die Cast

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NANOMECHANICAL AND CORROSION PROPERTIES OF ZK60 MAGNESIUM ALLOY IMPROVED BY GD ION IMPLANTATION

Surface Review and Letters ◽

10.1142/s0218625x14500851 ◽

2014 ◽

Vol 21 (06) ◽

pp. 1450085 ◽

Cited By ~ 7

Author(s):

XUE WEI TAO ◽

ZHANG ZHONG WANG ◽

XIAO BO ZHANG ◽

ZHI XIN BA ◽

YA MEI WANG

Keyword(s):

Magnesium Alloy ◽

Ion Implantation ◽

Photoelectron Spectroscopy ◽

Surface Hardness ◽

Protective Layer ◽

Hybrid Structure ◽

Nacl Solution ◽

Corrosion Properties ◽

X Ray ◽

Zk60 Magnesium Alloy

Gadolinium ( Gd ) ion implantation with doses from 2.5 × 1016 to 1 × 1017 ions/cm2 into ZK60 magnesium alloy was carried out to improve its surface properties. X-ray photoelectron spectroscopy (XPS), nanoindenter, electrochemical workstation and scanning electron microscope (SEM) were applied to analyze the chemical composition, nanomechanical properties and corrosion characteristics of the implanted layer. The results indicate that Gd ion implantation produces a hybrid-structure protective layer composed of MgO , Gd 2 O 3 and metallic Gd in ZK60 magnesium alloy. The surface hardness and modulus of the Gd implanted magnesium alloy are improved by about 300% and 100%, respectively with the dose of 1 × 1017 ions/cm2, while the slowest corrosion rate of the magnesium alloy in 3.5 wt.% NaCl solution is obtained with the dose of 5 × 1016 ions/cm2.

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Structure and formation mechanism of phosphate conversion coating on die-cast AZ91D magnesium alloy

Corrosion Science ◽

10.1016/j.corsci.2007.08.007 ◽

2008 ◽

Vol 50 (2) ◽

pp. 329-337 ◽

Cited By ~ 170

Author(s):

Wanqiu Zhou ◽

Dayong Shan ◽

En-Hou Han ◽

Wei Ke

Keyword(s):

Magnesium Alloy ◽

Formation Mechanism ◽

Conversion Coating ◽

Az91d Magnesium Alloy ◽

Die Cast

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.179-180.757 ◽

2011 ◽

Vol 179-180 ◽

pp. 757-761 ◽

Cited By ~ 4

Author(s):

Kai Jin Huang ◽

Hou Guang Liu ◽

Chang Rong Zhou

Keyword(s):

Corrosion Resistance ◽

Magnesium Alloy ◽

Laser Cladding ◽

Composite Coatings ◽

Corrosion Property ◽

Nacl Solution ◽

X Ray Diffraction ◽

X Ray ◽

Good Corrosion Resistance ◽

Az91d Magnesium Alloy

To improve the corrosion 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 corrosion resistance of the coatings was tested in 3.5wt.% NaCl solution. The results show that the coatings mainly consist of amorphous and different crystalline phases. The coatings compared with AZ91D magnesium alloy exhibit good corrosion resistance because of the presence of the amorphous phase in the coatings.

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Effect of sintering temperature on corrosion properties of sol–gel based Al2O3 coatings on pre-treated AZ91D magnesium alloy

Corrosion Science ◽

10.1016/j.corsci.2009.08.031 ◽

2009 ◽

Vol 51 (12) ◽

pp. 2950-2958 ◽

Cited By ~ 35

Author(s):

Xiankang Zhong ◽

Qing Li ◽

Bo Chen ◽

Juping Wang ◽

Junying Hu ◽

...

Keyword(s):

Magnesium Alloy ◽

Sintering Temperature ◽

Sol Gel ◽

Corrosion Properties ◽

Az91d Magnesium Alloy

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The Influences of Additives on the Corrosion Resistant Properties of Electroless Plating Ni-Co-P Alloy on the AZ91D Magnesium Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1004-1005.733 ◽

2014 ◽

Vol 1004-1005 ◽

pp. 733-736

Author(s):

Zu Xiao Yu ◽

Ya Li Sun ◽

Xin Huang

Keyword(s):

Magnesium Alloy ◽

Deposition Rate ◽

Electroless Plating ◽

Acid Resistance ◽

Ammonium Fluoride ◽

Alloy Coating ◽

Corrosion Current ◽

Corrosion Properties ◽

Corrosion Resistant ◽

Az91d Magnesium Alloy

To improve the anti-corrosion properties of the AZ91D magnesium alloy, the electroless plating Ni-Co-P on the AZ91D magnesium alloy is necessary. The influences of additives (ammonium fluoride (NH4F) and hexamethylenetetramine (HMTA)) on deposition rate, corrosion rate, acid resistance, corrosion current, corrosion potential and webster hardness of electroless plating Ni-Co-P alloy coating, were investigated using electrochemical methods, etc. The results show that the deposition rate and corrosion resistance properties of electroless plating Ni-Co-P are obviously improved when the additives, including NH4F (2%) and hexamethylenetetramine (HMTA, 1%), are added into plating solution, respectively. In addition, the global particles in the Ni-Co-P coating become smaller with the addition of NH4F by comparison with no additives and coatings are dense, uniform and defect-free.

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