scholarly journals Microstructure and Corrosion of Cast Magnesium Alloy ZK60 in NaCl Solution

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3833
Author(s):  
Zhen Li ◽  
Zeyin Peng ◽  
Kai Qi ◽  
Hui Li ◽  
Yubing Qiu ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Rate ◽  
Electrochemical Techniques ◽  
Second Phase ◽  
Corrosion Mechanism ◽  
Schematic Model ◽  
General Corrosion ◽  
Second Phase Particles ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium

In this work, the effects of the microstructure and phase constitution of cast magnesium alloy ZK60 (Mg-5.8Zn-0.57Zr, element concentration in wt.%) on the corrosion behavior in aqueous NaCl (0.1 mol dm−3) were investigated by weight-loss measurements, hydrogen evolution tests, and electrochemical techniques. The alloy was found to be composed of α-Mg matrix, with large second-phase particles of MgZn2 deposited along grain boundaries and a Zr-rich region in the central area of the grains. The large second-phase particles and the Zr-rich regions were more stable than the Mg matrix, resulting in a strong micro-galvanic effect. A filiform corrosion was found. It originated from the second-phase particles in the grain boundary regions in the early corrosion period. The filaments gradually occupied most areas of the alloy surface, and the general corrosion rate decreased significantly. Corrosion pits were developed under filaments. The pit growth rate decreased over time; however, it was about eight times larger than the general corrosion rate. A schematic model is presented to illustrate the corrosion mechanism.

Microstructure and second-phase particles in low- and high-pressure die-cast magnesium alloy AM50

2005 ◽  
Vol 36 (8) ◽  
pp. 1989-1997 ◽  
Author(s):  
Val Y. Gertsman ◽  
Jian Li ◽  
Su Xu ◽  
James P. Thomson ◽  
Mahi Sahoo
Keyword(s):  
High Pressure ◽  
Magnesium Alloy ◽  
Second Phase ◽  
Die Cast ◽  
Second Phase Particles ◽  
Cast Magnesium Alloy ◽  
Alloy Am50 ◽  
Cast Magnesium

Assessment of Microstructure and Wear Resistance of Friction Stir Processed Cast Mg-Al-Zn Magnesium Alloy

2015 ◽  
Vol 787 ◽  
pp. 442-447 ◽  
Author(s):  
R. Jayaraman ◽  
T. Balusamy ◽  
A.K. Lakshminarayanan
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Base Metal ◽  
Second Phase ◽  
Micro Hardness ◽  
Friction Stir ◽  
Second Phase Particles ◽  
Metal Wear ◽  
Pin On Disc ◽  
Cast Magnesium

Microstructure, micro hardness and wear resistance of friction stir processed cast magnesium alloy are investigated in this work. Image analysis is used to differentiate the amount of phases present in the base metal and friction stir processed regions. Hardness mapping indicates that the frictions stir processed region has 64 % increase in microhardness compared to the base metal. Wear resistance was evaluated using pin-on-disc testing and it is found that the friction stir processed region has superior wear resistance compared to the base metal. Fine grains with uniformly distributed second phase particles are the reasons for improved microhardness and wear resistance of friction stir processed region.

Corrosion Behaviors of Fluoride Treated Cast Magnesium Alloy in Hank’s Solution

2016 ◽  
Vol 852 ◽  
pp. 113-119
Author(s):  
Chun Yan Zhang ◽  
Ming Bo Yang ◽  
Cheng Long Liu
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Az31 Alloy ◽  
Second Phase ◽  
Magnesium Alloy Az31 ◽  
Corrosion Behaviors ◽  
Second Phases ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium ◽  
Hank’S Solution

Fluoride conversion films were synthesized on cast magnesium alloy AZ31 by immersion in hydrofluoric acid for different days to improve the corrosion resistance of Mg alloys as degradable implant material. The effects of the films on the corrosion behavior of the mg substrates were investigated by immersion tests. The results showed the fluoride conversion film was affected by the distribution of the chemical component of cast AZ31 alloy and the film on the second phases has more pores and micro-crack, but the bottoms of the pores were also covered by the conversion film and the substrate was not exposed through the pores. The fluoride conversion coatings significantly improved the corrosion resistance of cast AZ31 alloy. The film on the second phase with more pores is the first to dissolve. The most improved corrosion protection was achieved by 15 days treatment with the thickest film in terms of hydrogen evolution rate and damage morphology.

Influence of anions, pH and coating on the localized corrosion behavior of AZ31 magnesium alloy in physiological environments

2016 ◽  
Vol 63 (4) ◽  
pp. 301-307 ◽  
Author(s):  
Qian Hu ◽  
Jing Liu ◽  
Feng Huang
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Substrate Surface ◽  
Electrochemical Techniques ◽  
Az31 Magnesium Alloy ◽  
Localized Corrosion ◽  
Corrosion Mechanism ◽  
Content Type ◽  
Average Corrosion Rate

Purpose The purpose of this paper was to clarify the influence of H2PO4-, HCO3-, pH increase and phosphate coating on corrosion rate and localized corrosion tendency of AZ31 magnesium alloy. Design/methodology/approach The corrosion behavior of AZ31 magnesium alloy in physiological environments was investigated by hydrogen evolution collection measurements, electrochemical techniques and by use of a three-dimensional digital microscope. Findings H2PO4- and HCO3- have corrosion inhibition effects on AZ31 magnesium alloy in normal saline solutions. After immersing for 54 h, the surface undulations decrease from 100 to about 60 μm and 45 μm. The average corrosion rate decreased with increasing pH value. The localized corrosion tendency, however, increased significantly. CaHPO4·2H2O [dicalcium phosphate dehydrate (DCPD)] coating could decrease the initial icorr of AZ31 substrate in Hank’s solution. With partial dissolution of the coating, localized corrosion was readily evident on the AZ31 substrate surface, and a large corrosion pit with depth of over 350 μm appeared. The combined effect of the presence of inhibited ions, the increase in pH during corrosion process and the DCPD coating caused the decrease in the average corrosion rate while enhancing the localized corrosion tendency, resulting in the observed localized attack. Originality/value The paper provides an essential insight into the localized corrosion mechanism of AZ31 magnesium alloy in physiological environments.

Particle-Stimulated Nucleation of Dynamic Recrystallization in AZ31 Alloy at Elevated Temperatures

2005 ◽  
Vol 488-489 ◽  
pp. 261-264 ◽  
Author(s):  
Lan Jiang ◽  
Guang Jie Huang ◽  
Stéphane Godet ◽  
John J. Jonas ◽  
Alan A. Luo
Keyword(s):  
Magnesium Alloy ◽  
Elevated Temperatures ◽  
Az31 Alloy ◽  
Coarse Grained ◽  
Second Phase ◽  
Compression Tests ◽  
Second Phase Particles ◽  
The Matrix ◽  
Second Phases ◽  
Cast Magnesium

Particle-stimulated nucleation (PSN) was investigated in magnesium alloy AZ31 to study the effect of the evolution of second-phases during extrusion and other metal forming processes. Compression tests were carried out on samples taken from coarse-grained as-cast magnesium alloy billets containing a lamellar Mg17All2 eutectic phase and (Al, Mn) particles. These revealed that particle-stimulated DRX nucleation (PSN) was taking place during hot deformation and that this is facilitated by the fragmentation of the Mg17All2. When Mg17All2 dissolves into the matrix at about 350°C, the (Al, Mn) particles remain effective in producing PSN at temperatures up to at least 400°C. This suggests that alloy design leading to a suitable distribution of second-phase particles can improve the properties and formability of wrought magnesium alloys.

MAGNESIUM MSR-B

Alloy Digest ◽  
1967 ◽  
Vol 16 (6) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Shear Strength ◽  
High Temperature ◽  
Magnesium Alloy ◽  
Yield Strength ◽  
Physical Properties ◽  
Heat Treating ◽  
Temperature Performance ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium

Abstract Magnesium MSR-B is a heat-treatable magnesium alloy with highest yield strength of any cast magnesium alloy up to 480 F. It is pressure tight and weldable by argon-arc. It is recommended for aircraft nose wheels, missile components, transmission cases, etc. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fatigue. It also includes information on low and high temperature performance, and corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Mg-63. Producer or source: Magnesium Elektron Ltd.

MAGNESIUM MSR-A

Alloy Digest ◽  
1962 ◽  
Vol 11 (7) ◽  
Keyword(s):  
Compressive Strength ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Magnesium Alloy ◽  
Yield Strength ◽  
Physical Properties ◽  
Heat Treating ◽  
Temperature Performance ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium

Abstract Magnesium MSR-A is a heat-treatable magnesium alloy with highest yield strength of any cast magnesium alloy up to 480 F. It is pressure tight and weldable by argon-arc. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as creep and fatigue. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, and joining. Filing Code: Mg-52. Producer or source: J. Stone & Company Ltd.

scholarly journals Deformation mechanisms in an AZ31 cast magnesium alloy as investigated by the acoustic emission technique

2007 ◽  
Vol 462 (1-2) ◽  
pp. 297-301 ◽  
Author(s):  
Enrique Meza-García ◽  
Patrik Dobroň ◽  
Jan Bohlen ◽  
Dietmar Letzig ◽  
František Chmelík ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Magnesium Alloy ◽  
Deformation Mechanisms ◽  
Acoustic Emission Technique ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium

An XPS Study of Native Oxide and Isothermal Oxidation Kinetics at 300 °C of AZ31 Twin Roll Cast Magnesium Alloy

2013 ◽  
Vol 81 (5-6) ◽  
pp. 529-548 ◽  
Author(s):  
H. Saleh ◽  
T. Weling ◽  
J. Seidel ◽  
M. Schmidtchen ◽  
R. Kawalla ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Oxidation Kinetics ◽  
Isothermal Oxidation ◽  
Native Oxide ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium ◽  
Xps Study ◽  
Twin Roll Cast ◽  
Twin Roll
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