Effects of impurities on phase transition changes according to heat treatment of porous anodic alumina fabricated in oxalic acid and phosphoric acid electrolytes

In this study, porous anodic alumina was formed on aluminum alloy AA6061 by anodizing using mixture of 0.3 M oxalic acid and phosphoric acid with concentration ranged from 0.1 M to 1.0 M. AA6061 alloys were anodized at 40 V and 25°C for 60 minutes. FESEM images show that the uniformity of the pores arrangement of porous anodic alumina decreased with the increasing concentration of phosphoric acid in the electrolyte. Well-ordered porous anodic alumina was formed in mixture of 0.3 M oxalic acid and 0.1 M phosphoric acid while disordered porous anodic alumina were formed when the concentration of phosphoric acid were in the range of 0.3 M to 1.0 M. Pore size and interpore distance were found to increase with the concentration of phosphoric acid in the mixture. X-ray diffraction patterns show that to γ-Al2O3 were formed on the surface of AA6061 after the anodizing process, regardless of the concentration of phosphoric acid in the mixture electrolyte.

Download Full-text

Surface morphology control on porous anodic alumina in phosphoric acid

Thin Solid Films ◽

10.1016/j.tsf.2010.01.004 ◽

2010 ◽

Vol 518 (14) ◽

pp. 3797-3800 ◽

Cited By ~ 13

Author(s):

Rong Zhang ◽

Kaiming Jiang ◽

Guqiao Ding

Keyword(s):

Surface Morphology ◽

Phosphoric Acid ◽

Morphology Control ◽

Anodic Alumina ◽

Porous Anodic Alumina

Download Full-text

Light emission from silicon-based porous anodic alumina formed in 0.5 M oxalic acid

Journal of Applied Physics ◽

10.1063/1.1595727 ◽

2003 ◽

Vol 94 (4) ◽

pp. 2407-2410 ◽

Cited By ~ 17

Author(s):

G. S. Huang ◽

X. L. Wu ◽

Y. Xie ◽

X. F. Shao ◽

S. H. Wang

Keyword(s):

Oxalic Acid ◽

Light Emission ◽

Anodic Alumina ◽

Porous Anodic Alumina ◽

Silicon Based

Download Full-text

The effect of n-alcohols on porous anodic alumina formed by self-organized two-step anodizing of aluminum in phosphoric acid

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2009.10.051 ◽

2010 ◽

Vol 204 (11) ◽

pp. 1729-1737 ◽

Cited By ~ 62

Author(s):

Leszek Zaraska ◽

Grzegorz D. Sulka ◽

Marian Jaskuła

Keyword(s):

Phosphoric Acid ◽

Anodic Alumina ◽

Porous Anodic Alumina ◽

Self Organized

Download Full-text

Tracer studies relating to alloying element behaviour in porous anodic alumina formed in phosphoric acid

Electrochimica Acta ◽

10.1016/j.electacta.2010.01.038 ◽

2010 ◽

Vol 55 (9) ◽

pp. 3175-3184 ◽

Cited By ~ 26

Author(s):

S.J. Garcia-Vergara ◽

H. Habazaki ◽

P. Skeldon ◽

G.E. Thompson

Keyword(s):

Phosphoric Acid ◽

Anodic Alumina ◽

Porous Anodic Alumina ◽

Alloying Element ◽

Tracer Studies

Download Full-text

Growth Kinetics and Morphology of Porous Anodic Alumina Films Formed Using Phosphoric Acid

Journal of The Electrochemical Society ◽

10.1149/1.1838701 ◽

1998 ◽

Vol 145 (8) ◽

pp. 2699-2706 ◽

Cited By ~ 23

Author(s):

Ahmad T. Shawaqfeh ◽

Ruth E. Baltus

Keyword(s):

Phosphoric Acid ◽

Growth Kinetics ◽

Anodic Alumina ◽

Porous Anodic Alumina ◽

Alumina Films

Download Full-text

A Novel Method for Fabricating Double Layers Porous Anodic Alumina in Phosphoric/Oxalic Acid Solution and Oxalic Acid Solution

Journal of Nanomaterials ◽

10.1155/2016/2978571 ◽

2016 ◽

Vol 2016 ◽

pp. 1-6 ◽

Cited By ~ 4

Author(s):

Yanfang Xu ◽

Xiaojiu Li ◽

Hao Liu ◽

Jie Xu

Keyword(s):

Oxalic Acid ◽

Acid Solution ◽

Oxalic Acid Solution ◽

Anodic Alumina ◽

Porous Anodic Alumina ◽

Double Layers ◽

Pore Density ◽

Interpore Distance ◽

Small Pore ◽

Novel Method

A novel method for fabricating ordered double layers porous anodic alumina (DL-PAA) with controllable nanopore size was presented. Highly ordered large pore layer with interpore distance of 480 nm was fabricated in phosphoric acid solution with oxalic acid addition at the potential of 195 V and the small pore layer was fabricated in oxalic acid solution at the potential from 60 to 100 V. Experimental results show that the thickness of large pore layer is linearly correlative with anodizing time, and pore diameter is linearly correlative with pore widening time. When the anodizing potential in oxalic acid solution was adjusted from 60 to 100 V, the small pore layers with continuously tunable interpore distance from 142 to 241 nm and pore density from1.94×109to4.89×109 cm−2were obtained. And the interpore distance and the pore density of small pore layers are closely correlative with the anodizing potential. The fabricated DL-PAA templates can be widely utilized for fabrication of ordered nanomaterials, such as superhydrophobic or gecko-inspired adhesive materials and metal or semiconductor nanowires.

Download Full-text