Effect of cerium concentration on microstructure, morphology and corrosion resistance of cerium–silica hybrid coatings on magnesium alloy AZ91D

2010 ◽  
Vol 69 (1) ◽  
pp. 52-56 ◽  
Author(s):  
Xiankang Zhong ◽  
Qing Li ◽  
Junying Hu ◽  
Xiaokui Yang ◽  
Fei Luo ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Hybrid Coatings ◽  
Alloy Az91d ◽  
Microstructure Morphology ◽  
Silica Hybrid

scholarly journals Environmentally Friendly Composite Film of Anodizing and Electrodeposition Coating Having a High Corrosion Resistance on Magnesium Alloy AZ91D

2007 ◽  
Vol 48 (12) ◽  
pp. 3118-3125 ◽  
Author(s):  
Masaaki Hara ◽  
Kenji Matsuda ◽  
Wataru Yamauchi ◽  
Masaaki Sakaguchi ◽  
Toshiyuki Yoshikata ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Composite Film ◽  
Environmentally Friendly ◽  
High Corrosion Resistance ◽  
High Corrosion ◽  
Alloy Az91d

Corrosion resistance of aged die cast magnesium alloy AZ91D

2004 ◽  
Vol 366 (1) ◽  
pp. 74-86 ◽  
Author(s):  
Guangling Song ◽  
Amanda L Bowles ◽  
David H StJohn
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Alloy Az91d ◽  
Die Cast ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium

Effects of Applied Voltages on Micro-Arc Oxidized Coatings of Magnesium Alloy AZ91D in Aluminate Solution

2010 ◽  
Vol 154-155 ◽  
pp. 471-474 ◽  
Author(s):  
Wei Yi Mu ◽  
Rui Xue Luo ◽  
Zheng Xian Li ◽  
Ji Hong Du ◽  
Zheng Ping Xi
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Pore Size ◽  
Applied Voltage ◽  
Significant Variation ◽  
Aluminate Solution ◽  
Alloy Az91d ◽  
Lower Porosity ◽  
Micro Arc Oxidation

Micro-arc oxidation coatings were prepared on magnesium alloy AZ91D substrates at the different applied voltages in aluminate solution. The morphologies, phase components, and corrosion resistances of the coatings were investigated. The effect of the applied voltages on the microstructure and corrosion resistance of the coatings was also discussed. The results indicate that the coatings are uniform in thickness, and mainly composed of MgAl2O4 and MgO. There were many residual discharging channels on the coatings surface. The coatings improved the corrosion resistances of magnesium alloy AZ91D considerably. With the increase of the applied voltage, the thickness and the MgAl2O4 content of the coatings increase, while no significant variation is observed in the MgO content. The coatings surface becomes lower porosity and larger pore size with increasing of the applied voltage. In addition, the corrosion resistances of the coatings on magnesium alloy AZ91D surface are obviously superior to the magnesium alloy AZ91D substrate in the 3.5 wt. % NaCl solutions, and the effect is more remarkable at higher voltage.

scholarly journals Corrosion protection of AZ91D magnesium alloy by a duplex coating

2020 ◽  
Vol 85 (10) ◽  
pp. 1317-1328
Author(s):  
López Forero ◽  
Ana Loperena ◽  
Ivana Lehr ◽  
Lorena Brugnoni ◽  
Silvana Saidman
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Antibacterial Properties ◽  
Silver Ions ◽  
Ringer Solution ◽  
Open Circuit ◽  
Duplex Coating ◽  
Alloy Az91d

A duplex coating was formed under potentiostatic conditions on magnesium alloy AZ91D in order to improve its corrosion resistance in a simulated physiological environment. The first layer was formed by anodization at low potentials in molybdate solution. The outer layer was a PPy film electrosynthesized in sodium salicylate solution. The conditions of the formation were determined to obtain a layer with globular morphology. The bilayer was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The corrosion protection properties of the coatings were examined in Ringer solution by monitoring the open circuit potential (OCP), polarization techniques, and electrochemical impedance spectroscopy (EIS). The obtained results showed that the bilayer improves the corrosion resistance of the substrate. Moreover, the duplex coating presented better anticorrosive properties than a single PPy film. Afterwards, the bilayer was modified by cementation of silver ions from a solution containing AgNO3. The modified electrode exhibited good antibacterial properties.

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