Corrosion resistance property of the ceramic coating obtained through microarc oxidation on the AZ31 magnesium alloy surfaces

2007 ◽  
Vol 201 (9-11) ◽  
pp. 4905-4908 ◽  
Author(s):  
Fei Chen ◽  
Hai Zhou ◽  
Bin Yao ◽  
Zhen Qin ◽  
Qingfeng Zhang
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Ceramic Coating ◽  
Microarc Oxidation ◽  
Az31 Magnesium Alloy ◽  
Resistance Property ◽  
Corrosion Resistance Property

Corrosion Behavior of AZ31 Magnesium Alloy with Microarc Oxidation Film Irradiated by High-Intensity Pulsed Ion Beam

2008 ◽  
Vol 373-374 ◽  
pp. 460-463 ◽  
Author(s):  
X.G. Han ◽  
P. Li ◽  
X.P. Zhu ◽  
M.K. Lei
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
High Intensity ◽  
Electrochemical Impedance ◽  
Ion Beam ◽  
Microarc Oxidation ◽  
Az31 Magnesium Alloy ◽  
Noticeable Improvement ◽  
Original Films ◽  
Sealing Layer

The microarc oxidation (MAO) films on AZ31 magnesium alloy were modified by high-intensity pulsed ion beam (HIPIB) at an ion current density of 200 A/cm2 with 1-5 shots. The modified MAO films presented a corrosion resistance superior to that of the original films. Scanning electron microscopy (SEM) observation revealed that a sealing layer was formed on the MAO films by HIPIB irradiation. The corrosion behaviors of the MAO films in 3.5 % NaCl solution were characterized by using electrochemical impedance spectroscopy (EIS). The noticeable improvement in the corrosion resistance of MAO films is attributed to the blocking effect of the sealing layer that hinders the process of electrolyte penetrating the MAO films to the magnesium alloy.

Microstructure and Corrosion Resistance of Microarc Oxidation Coatings on AZ31 Magnesium Alloy Extrusion Profiles

2012 ◽  
Vol 557-559 ◽  
pp. 1993-1997
Author(s):  
Jie Ma ◽  
Yuan Sheng Yang ◽  
Xiu Chun Wang ◽  
Jing Zhang ◽  
Shuo Liu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Microarc Oxidation ◽  
Corrosion Current ◽  
Spot Test ◽  
Pulse Voltage ◽  
Az31 Magnesium Alloy ◽  
Oxidation Treatment ◽  
Coating Surface ◽  
Structure Surface

Microarc oxidation coatings were prepared on the surface of AZ31 magnesium alloy profiles. Oxidation time of the coatings was between 5min-10min. The phase structure, surface morphology and corrosion resistance of the coatings were investigated using SEM, XRD, copper sulfate spot test and polarization curve test. The results indicate: the main phase compositions of the microarc oxidation coatings are MgO, Mg2SiO4 and MgSiO3; with increasing pulse voltage, the micropore diameter of the coating surface becomes larger, the micropore number reduces and the coating surface roughness increases; the corrosion current density of magnesium alloy reduces significantly after microarc oxidation treatment. The pulse voltage of microarc oxidation should be controlled between 240V-360V to obtain the best corrosion resistance.

Electrochemical Impedance Spectroscopy (EIS) Study of Nano-Composite Polyurea Coating under the Wet-Dry Cyclic Conditions

2014 ◽  
Vol 789 ◽  
pp. 495-500
Author(s):  
Bing Ying Wang ◽  
Qing Hao Shi ◽  
Wen Long Zhang
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Composite Coating ◽  
Electrochemical Impedance ◽  
Protective Action ◽  
Experimental Result ◽  
Resistance Property ◽  
Corrosion Resistance Property ◽  
Mass Fractions

The polyurea was modified by adding different amounts of nanometer ZnO. The corrosion behavior of polyurea/primer composite coating system in wet-dry cyclic environment of 3.5% NaCl solution was studied by using the Electrochemical Impedance Spectroscopy (EIS) measurement and adhesion test technology. The experimental result showed that, different mass fractions of nanometer ZnO had different influences on the corrosion resistance property of coating. When the mass fraction of nanometer ZnO was 5%, the composite coating had the largest protective action. The corrosion resistance property of nanometer ZnO can be improved by increasing the density of polyurea coating, however, the corrosion resistance property of polyurea coating will be weakened in case of exceeding the critical adding amount.

Al–AlN composite coatings on AZ31 magnesium alloy for surface hardening and corrosion resistance

Vacuum ◽  
2021 ◽  
pp. 110146
Author(s):  
Wenling Xie ◽  
Yiman Zhao ◽  
Bin Liao ◽  
Pan Pang ◽  
Dongsing Wuu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Surface Hardening ◽  
Composite Coatings ◽  
Az31 Magnesium Alloy

Phosphate film free of chromate, fluoride and nitrite on AZ31 magnesium alloy and its corrosion resistance

2012 ◽  
Vol 22 (11) ◽  
pp. 2713-2718 ◽  
Author(s):  
Xue-jun CUI ◽  
Chun-hai LIU ◽  
Rui-song YANG ◽  
Ming-tian LI ◽  
Xiu-zhou LIN ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Az31 Magnesium Alloy ◽  
Phosphate Film
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