Corrosion of hot extrusion AZ91 magnesium alloy: I-relation between the microstructure and corrosion behavior

2011 ◽  
Vol 53 (5) ◽  
pp. 1960-1968 ◽  
Author(s):  
Tao Zhang ◽  
Yawei Shao ◽  
Guozhe Meng ◽  
Zhongyu Cui ◽  
Fuhui Wang
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Hot Extrusion ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium

Corrosion behavior of AZ91 magnesium alloy in dilute NaCl solutions

2010 ◽  
Vol 31 (2) ◽  
pp. 857-863 ◽  
Author(s):  
Lei Wang ◽  
Bo-Ping Zhang ◽  
Tadashi Shinohara
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium

scholarly journals Improvement of AZ91 Alloy Corrosion Properties by Duplex NI-P Coating Deposition

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1357 ◽  
Author(s):  
Jaromír Wasserbauer ◽  
Martin Buchtík ◽  
Jakub Tkacz ◽  
Stanislava Fintová ◽  
Jozef Minda ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
Az91 Alloy ◽  
Neutral Salt ◽  
Az91 Magnesium Alloy ◽  
Corrosion Properties ◽  
Az91 Magnesium

The corrosion behavior of duplex Ni-P coatings deposited on AZ91 magnesium alloy was studied. The electroless deposition process of duplex Ni-P coating consisted in the preparation of low-phosphorus Ni-P coating (5.7 wt.% of P), which served as a bond coating and high-phosphorus Ni-P coating (11.5 wt.% of P) deposited on it. The duplex Ni-P coatings with the thickness of 25, 50, 75 and 100 µm were deposited on AZ91 magnesium alloy. The electrochemical corrosion behavior of coated AZ91 magnesium alloy was investigated by electrochemical impedance spectroscopy and potentiodynamic polarization method in 0.1 M NaCl. Obtained results showed a significant improvement in the corrosion resistance of coated specimens when compared to uncoated AZ91 magnesium alloy. From the results of the immersion tests in 3.5 wt.% NaCl, 10% solution of HCl and NaOH and 5% neutral salt spray, a noticeable increase in the corrosion resistance with the increasing thickness of the Ni-P coating was observed.

SRET Evaluation of the Corrosion Behavior of Thixocast AZ91 Magnesium Alloy in Dilute NaCl Solution at Room Temperature

2019 ◽  
Vol 3 (31) ◽  
pp. 295-311 ◽  
Author(s):  
Shize Jin ◽  
Edward Ghali ◽  
Carsten Blawert ◽  
Wolfgang Dietzel
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Room Temperature ◽  
Nacl Solution ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium

Influence of Cl- on Corrosion Behavior of AZ91 Magnesium Alloy in Simulating Acid Rain

2011 ◽  
Vol 686 ◽  
pp. 181-185
Author(s):  
Wan Qiu Zhou ◽  
Wei Tang ◽  
Da Yong Shan ◽  
En Hou Han ◽  
Wei Ke
Keyword(s):  
Magnesium Alloy ◽  
Acid Rain ◽  
Corrosion Behavior ◽  
Localized Corrosion ◽  
Passive State ◽  
Nacl Solution ◽  
Az91 Magnesium Alloy ◽  
Β Phase ◽  
Α Phase ◽  
Az91 Magnesium

Initial corrosion behavior of AZ91 magnesium alloy in simulating acid rain containing Cl-is investigated by SEM/EDX and electrochemical method. The results show that corrosion of magnesium alloy in diluted NaCl solution was localized corrosion, and the attack only occurred around the scattered AlMn particle which induced the departure of AlMn from metal matrix. HSO3-in acid rain induced the dissolution of corrosion in α phase, β phase was not be corroded and presented in passive state. The corrosion of magnesium alloy in simulating acid rain containing Cl-was mainly induced by HSO3-, and the existence of Cl-accelerated the corrosion process.

Superplasticity of an AZ91 Magnesium Alloy

2007 ◽  
Vol 567-568 ◽  
pp. 365-368 ◽  
Author(s):  
Zoltán Száraz ◽  
Zuzanka Trojanová ◽  
Talant Ryspaev ◽  
Volker Wesling
Keyword(s):  
Magnesium Alloy ◽  
Strain Rate ◽  
Rate Sensitivity ◽  
Hot Extrusion ◽  
Az91 Magnesium Alloy ◽  
Physical Mechanisms ◽  
Heat Treated ◽  
Elongation To Failure ◽  
Az91 Magnesium ◽  
Two Stages

The superplastic deformation characteristics of the AZ91, the mostly used magnesium alloy, were investigated at various strain rates in the interval from 3x10-5 to 1x10-2 s-1 and temperature of 420 °C. To prepare superplastic alloys thermo-mechanical treatment was used. Cast materials were heat-treated in two stages, after homogenization at 415 °C for 10 h were submitted to the precipitation annealing at temperature in the range of 200-380 °C for 10 h, and deformed by hot extrusion. Microstructure of samples was observed by the light microscope Olympus. Strain rate sensitivity parameter m has been estimated by the abrupt strain rate changes method. The strong strain rate dependence of the m-parameter was found. The highest elongation to failure, 584%, was found for the samples aged at 380 °C. Possible physical mechanisms of the superplastic flow are discussed.

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