Adsorption at inorganic surfaces. V. Adsorption of sulphonated dyes the anodic film on aluminium

1959 ◽  
Vol 9 (9) ◽  
pp. 457-466
Author(s):  
C. H. Giles ◽  
H. V. Mehta ◽  
S. M. K. Rahman ◽  
C. E. Stewart
Keyword(s):  
Anodic Film

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.

Mechanical instability and pore generation in anodic alumina

2006 ◽  
Vol 462 (2072) ◽  
pp. 2345-2358 ◽  
Author(s):  
S.J Garcia-Vergara ◽  
L Iglesias-Rubianes ◽  
C.E Blanco-Pinzon ◽  
P Skeldon ◽  
G.E Thompson ◽  
...  
Keyword(s):  
Pore Formation ◽  
Anodic Alumina ◽  
Anodic Film ◽  
Nuclear Reaction Analysis ◽  
Wall Region ◽  
High Plasticity ◽  
Mechanical Instability ◽  
Porous Films ◽  
Anodic Films ◽  
Growth Stresses

This paper examines the mechanism of pore formation in anodic films on aluminium. For this purpose, the dimensional changes of specimens during growth of porous films on aluminium in phosphoric and sulphuric acid electrolytes are examined using transmission and scanning electron microscopies. Further, the compositions of films and the efficiencies of anodizing are determined by Rutherford backscattering spectroscopy and nuclear reaction analysis. Significantly, the efficiency of anodizing is about 60%, while the surface of the anodic film is located above the original aluminium surface, i.e. before anodizing. The ratio of the thickness of the anodic film relative to the thickness of the consumed aluminium is about 1.35 for the selected conditions of anodizing. The behaviour runs counter to the widely accepted mechanism of pore formation by field-assisted dissolution of alumina. It is explained by the high plasticity of the anodic alumina in the barrier region in the presence of ionic transport, with film growth stresses displacing material from the barrier layer towards the cell wall region during anodizing. The response of the film to volume constraints on growth indicates a major role of stress and stress-relief processes in determining the morphology and self-regulating organization of pores.

A flow model of porous anodic film growth on aluminium

2006 ◽  
Vol 52 (2) ◽  
pp. 681-687 ◽  
Author(s):  
S.J. Garcia-Vergara ◽  
P. Skeldon ◽  
G.E. Thompson ◽  
H. Habazaki
Keyword(s):  
Flow Model ◽  
Film Growth ◽  
Anodic Film

Nature and mechanism of anodic film formation on Cu in alkaline phosphate media

1981 ◽  
Vol 125 (2) ◽  
pp. 321-331 ◽  
Author(s):  
Y.A. El-Tantawy ◽  
F.M. Al-Kharafi ◽  
A. Katrib
Keyword(s):  
Film Formation ◽  
Anodic Film ◽  
Alkaline Phosphate

Stability of the anodic film on aluminium in relation to the nature of some anions

1973 ◽  
Vol 24 (3) ◽  
pp. 200-206 ◽  
Author(s):  
I. A. Ammar ◽  
S. Darwish ◽  
E. A. Ammar
Keyword(s):  
Anodic Film
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