Corrosion Behavior of Anodic Films Formed on Aluminium 7A04 Alloy in Boric/Sulphuric Mixed Acid and in Chromic Acid

2011 ◽  
Vol 399-401 ◽  
pp. 95-98
Author(s):  
Shan Deng ◽  
Lei Xu ◽  
Qiu Ze Li ◽  
Xing Min Huang ◽  
Shu Lin Liang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Oxide Film ◽  
Corrosion Behavior ◽  
Copper Sulfate ◽  
Chromic Acid ◽  
Anodic Oxide ◽  
Anodic Oxide Film ◽  
Anodic Films ◽  
Mixed Acid ◽  
Better Than

The corrosion behavior of the anodic oxide film on aluminium 7A04 alloy is investigated in current paper, where the different anodic oxide films are prepared. Morphology observation on different anodic films is carried out by using laser confocal microscopy (LCM) and copper sulfate test. Meanwhile, the electrochemical properties are evaluated through using electrochemical impedance spectroscopy (EIS). The LCM observation shows that the anodic oxide film formed in boric/sulphuric mixed acid is uniform with porous appearance, while the anodic oxide film formed in chromic aid is nonporous one but defective. The copper sulfate test results show that the corrosion regions almost developed from micropores in strong corrosive media. The evaluation of EIS in NaCl solution demonstrates that the corrosion resistance of specimen with anodic oxide film is much better than that without film. Furthermore, the corrosion resistance of anodic film formed in boric/sulphuric mixed acid is better than that formed in chromic acid.

scholarly journals Lattice images of porous anodic oxide film formed on aluminum in chromic acid solution.

1989 ◽  
Vol 40 (12) ◽  
pp. 1361-1365
Author(s):  
Sachiko ONO ◽  
Tomoko KAWAGUCHI ◽  
Hideki ICHINOSE ◽  
Yoichi ISHIDA ◽  
Noboru MASUKO
Keyword(s):  
Oxide Film ◽  
Acid Solution ◽  
Chromic Acid ◽  
Anodic Oxide ◽  
Anodic Oxide Film ◽  
Lattice Images

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

Study of Corrosion Resistance of Anodized Ti6Al4V in SBF

2005 ◽  
Vol 486-487 ◽  
pp. 205-208 ◽  
Author(s):  
Ying Zhao ◽  
Tian Ying Xiong ◽  
Hua-Zi Jin ◽  
Li Bin Wang ◽  
Tie Fan Li
Keyword(s):  
Corrosion Resistance ◽  
Oxide Film ◽  
Potentiodynamic Polarization ◽  
Anodic Oxide ◽  
Immersion Test ◽  
Protective Role ◽  
Anodic Oxide Film ◽  
Potentiodynamic Polarization Curves ◽  
Total Immersion

A layer of amorphous thick anodic oxide film was formed on Ti6Al4V substrate after anodization, and its thickness achieved 30-40µm. After immersion in SBF, anodized sample and substrate indicated different corrosion resistance. According to icorr, Rp and Ecorr, the concerned experimental results of potentiodynamic polarization curves, the anodic oxide film provided effective corrosion protection, which could be attributed to its relatively uniform, smooth, compact and intact microstructure. And the results of total immersion test also proved the protective role of the anodic film.

scholarly journals The Effect of Potential on Surface Characteristic and Corrosion Resistance of Anodic Oxide Film Formed on Commercial Pure Titanium at the Potentiodynamic-Aging Mode

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 370 ◽  
Author(s):  
Ling Zhang ◽  
Yanqing Duan ◽  
Rui Gao ◽  
Jianyun Yang ◽  
Keyi Wei ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Oxide Film ◽  
Photoelectron Spectroscopy ◽  
Pure Titanium ◽  
Anodic Oxide ◽  
Surface Characteristic ◽  
Anodic Oxide Film ◽  
Electrode Impedance ◽  
X Ray ◽  
Anodic Potential

Anodic oxidation treatment of commercially pure titanium was carried out at the voltages of 10, 30, 50 V in 0.5 M H2SO4 solution at the potentiodynamic-aging mode so as to obtain the effects of the anodic potential on the surface characteristic and corrosion resistance of the anodic oxide film. The influences of potential on the surface morphology, the roughness, the crystalline behavior, the chemical composition and the corrosion resistance of the anodic oxide films were investigated by using scanning electron microscopy (SEM), atomic force microscope (AFM), Raman spectrum, X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), potentiodynamic polarization curves and electrode impedance spectroscopy (EIS). The results show that increasing anodic potential at the potentiodynamic-aging mode can significantly enhance thickness, flatness, crystallization, chemical stability, and corrosion resistance of anodic oxide film.

Deposited emulsion particles in the pores of aluminum oxide film

1978 ◽  
Vol 36 (1) ◽  
pp. 450-451
Author(s):  
Michio Ashida ◽  
Yasukiyo Ueda
Keyword(s):  
Oxide Film ◽  
Acid Solution ◽  
Barrier Layer ◽  
Colloidal Particles ◽  
Oxalic Acid Solution ◽  
Anodic Oxide ◽  
Anodic Oxide Film ◽  
Carbon Replica ◽  
Sectioning Method ◽  
Thin Sectioning

An anodic oxide film is formed on aluminum in an acidic elecrolyte during anodizing. The structure of the oxide film was observed directly by carbon replica method(l) and ultra-thin sectioning method(2). The oxide film consists of barrier layer and porous layer constructed with fine hexagonal cellular structure. The diameter of micro pores and the thickness of barrier layer depend on the applying voltage and electrolyte. Because the dimension of the pore corresponds to that of colloidal particles, many metals deposit in the pores. When the oxide film is treated as anode in emulsion of polyelectrolyte, the emulsion particles migrate onto the film and deposit on it. We investigated the behavior of the emulsion particles during electrodeposition.Aluminum foils (99.3%) were anodized in either 0.25M oxalic acid solution at 30°C or 3M sulfuric acid solution at 20°C. After washing with distilled water, the oxide films used as anode were coated with emulsion particles by applying voltage of 200V and then they were cured at 190°C for 30 minutes.

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