Effect of Cu2+ Doped in Sol on Properties of Sealed Film on Anodized Al Alloy

2010 ◽  
Vol 33 ◽  
pp. 290-294
Author(s):  
Qi Zhou ◽  
Xin Wang ◽  
Li Fang Zhang ◽  
Xin Ma ◽  
H.B. Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Staphylococcus Aureus ◽  
Corrosion Resistance ◽  
Antibacterial Property ◽  
Anodic Oxide ◽  
Anodic Oxide Film ◽  
Heating Process ◽  
Al Alloy ◽  
Alumina Sol ◽  
The One

The corrosion resistance of anodic oxide film sealed with alumina sol can improved. Cu2+ was put into the alumina sol so that antibacterial property was endowed to the sealed film. Composition, morphology and corrosion resistance of sealed film doped with Cu2+ were studied by DSC, EIS and SEM etc. The film sealed by doping Cu2+ in sol has less and narrower crack on the surface than the one without Cu2+. The gel without Cu2+ has more chemical reaction and phase transition than that with Cu2+ in the heating process observing from the DSC curve, which results in more cracks on the surface of sealed films without Cu2+. Sol doped with Cu2+ can enhance corrosion resistance inferred from the polarization curve, in a way. The films sealed by sol with Cu2+ have a good antibacterial on Staphylococcus aureus. The antibacterial rate is more than 99%. The results show sol doped Cu2+ not only improve corrosion resistance but also have antibacterial property.

Effects of the Duration of Potentiostatic Anodizing on the Corrosion Resistance and Surface Morphology of Films Formed on Mg-Al Alloys

2005 ◽  
Vol 486-487 ◽  
pp. 125-128 ◽  
Author(s):  
Seong Jong Kim ◽  
Seok Ki Jang ◽  
Jeong Il Kim
Keyword(s):  
Corrosion Resistance ◽  
Surface Morphology ◽  
Anodic Oxide ◽  
Al Alloys ◽  
Anodic Film ◽  
Al Alloy ◽  
Active Dissolution ◽  
Dissolution Reaction ◽  
Alloy Az91 ◽  
Morphology Of Films

The effects of the duration of potentiostatic anodizing on the corrosion resistance and surface morphology of anodic oxide films formed on Mg-Al alloy (AZ91) in 1 M NaOH were investigated. With the formation of an anodic film, the current density decreased gradually, started to stabilize at 300 s, and was relatively constant at 600 s. These results may be related to the increased time for catalysis of the active dissolution reaction, which not only enlarges the area covered by the anodic film, but also produces a more coherent, thicker film. The reference corrosion potentials of the anodic oxide film for AZ91 shifted in the noble direction with time. In general, the corrosion resistance characteristics were improved with anodizing time.

Effect of Voltage on Mg-Li-Al Alloy Anodic Oxide Film

2018 ◽  
Vol 941 ◽  
pp. 1194-1197 ◽  
Author(s):  
Naoya Miyakita ◽  
Natsuki Tanigaki ◽  
Taiki Morishige ◽  
Toshihide Takenaka
Keyword(s):  
Oxide Film ◽  
Phosphoric Acid ◽  
Anodic Oxidation ◽  
Surface Coating ◽  
Low Voltage ◽  
Active Surface ◽  
Anodic Oxide ◽  
Al Alloys ◽  
Anodic Oxide Film ◽  
Al Alloy

Anodic oxidation of Mg-Li-Al alloys using phosphoric acid-based bath were processed to obtain the corrosion-proof surface coating. The specimen oxidized at low voltage anodically dissolved without the formation of oxidized film. Anodic oxidation film could be formed at higher voltage due to thin layer preferentially formed on tthe active surface, this layer develops to stable thick film. There were no significant differences in film thickness between LA141 and LA143 alloys.

Effects of Current Density on the Formation of Anodic Oxide Films on AZ91

2006 ◽  
Vol 510-511 ◽  
pp. 166-169
Author(s):  
Seong Jong Kim ◽  
Jeong Il Kim
Keyword(s):  
Corrosion Resistance ◽  
Current Density ◽  
Anodic Polarization ◽  
Oxide Films ◽  
Anodic Oxide ◽  
Anodic Polarization Curve ◽  
Al Alloy ◽  
Anodic Oxide Films ◽  
Active Metal ◽  
Naoh Solution

Magnesium must be surface treated to prevent corrosion, since it is a very active metal electrochemically. On anodizing, a compact film several tens of micrometers thick forms on magnesium, which imparts good corrosion resistance. The Mg-Al alloy (AZ91) was anodized in 1 M NaOH solution. The surface morphology of the anodized films was observed using scanning electron microscopy (SEM), energy-dispersive x-ray (EDX), and electrochemical methods. The effects of current density on the formation of anodic oxide films for a Mg-Al alloy in 1 M NaOH were investigated. In the anodic polarization curve, the reference corrosion potentials were far greater at 4-9 mA/cm2 than at 1 mA/cm2. The film that formed at 1 mA/cm2 was thin, suggesting that parts of the film had been dissolved or destroyed during the anodic polarization test. Corrosion resistance differed owing to concentric differences in current flow. Thick anodic oxide films were formed at higher applied currents.

Applied Research of Titanium Oxide to Seal the Anodized Al Alloy

2011 ◽  
Vol 183-185 ◽  
pp. 1621-1625
Author(s):  
Qi Zhou ◽  
Xin Wang ◽  
Li Fang Zhang ◽  
Chun Lin He ◽  
Qing Kui Cai ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Saline Water ◽  
Three Dimensional ◽  
Al Alloy ◽  
Technological Parameters ◽  
Cleaning Efficiency ◽  
Confocal Scanning ◽  
Alumina Sol ◽  
Self Cleaning ◽  
Surface Morphologies

The anodized Al alloy films are sealed in the alumina sol with anatase type of titanium oxide.Coloration experiment; acid drip test and self-cleaning efficiency are used as evaluation criterions. Orthogonal test of sol sealed films and Two Factor test are used to value the influence of technological parameters on properties of the sealed films. The results show that the corrosion resistance of sealed film doped with TiO2 was superior to that of without in neutral saline water. Three-dimensional surface morphologies obtained by OLS3100 laser confocal scanning microscope (LSCM ) show that the sealed films with are smoother than ones without TiO2 and its pits in the sealed film are less. The sealed films with TiO2 have both corrosion resistance and self-cleaning effect.

Evaluation of corrosion resistance of aluminium anodic oxide film by Hunter's highly sensitive method

1981 ◽  
Vol 26 (9) ◽  
pp. 1303-1309 ◽  
Author(s):  
Shinobu Sato ◽  
Yasuhiko Itoi ◽  
Akio Hasumi ◽  
Eiichi Sato
Keyword(s):  
Corrosion Resistance ◽  
Oxide Film ◽  
Anodic Oxide ◽  
Anodic Oxide Film ◽  
Highly Sensitive ◽  
Sensitive Method

scholarly journals Fluorine Plasma Corrosion Resistance of Anodic Oxide Film Depending on Electrolyte Temperature

2018 ◽  
Vol 27 (1) ◽  
pp. 9-13 ◽  
Author(s):  
Jae-Soo Shin ◽  
Minjoong Kim ◽  
Je-beom Song ◽  
Nak-gwan Jeong ◽  
Jin-tae Kim ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Oxide Film ◽  
Anodic Oxide ◽  
Anodic Oxide Film ◽  
Electrolyte Temperature

Effects of Anodizing Time on Anodizing of Mg-Al Alloy in Alkaline Solution

2006 ◽  
Vol 510-511 ◽  
pp. 686-689
Author(s):  
Seong Jong Kim ◽  
Jeong Il Kim
Keyword(s):  
Oxide Film ◽  
Film Thickness ◽  
Alkaline Solution ◽  
Anodic Oxide ◽  
Anodic Oxide Film ◽  
Al Alloy ◽  
Active Dissolution ◽  
Dissolution Reaction ◽  
Edx Analyses ◽  
Time Required

This paper investigated the effects of anodizing time on the formation of anodic oxide films on a Mg-Al alloy in alkaline solution. The thickness of the anodic oxide film was increased by increasing the time required to generate the active dissolution reaction. When anodizing at various anodizing time, the potential after passivity increased with time, which implies growth in film thickness. When the anodizing time was varied, the quantity of oxygen increased with time in the white areas (the film), i.e., more film was observed in the SEM and EDX analyses.

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