Anodizing of aluminium and its alloys. Assessment of quality of sealed anodic oxidation coatings by measurement of the loss of mass after immersion in phosphoric acid/chromic acid solution

2015 ◽  
Keyword(s):  
Phosphoric Acid ◽  
Acid Solution ◽  
Anodic Oxidation ◽  
Chromic Acid ◽  
Loss Of Mass

scholarly journals Selection of synthesis parameters for niobium pentaoxide films by oxidation in phosphoric acid solution.

2020 ◽  
Vol 11 (3-2020) ◽  
pp. 137-142
Author(s):  
M. A. Okunev ◽  
◽  
A. R. Dubrovskii ◽  
O. V. Makarova ◽  
S. A. Kuznetsov ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Acid Solution ◽  
Anodic Oxidation ◽  
Process Parameters ◽  
Phosphoric Acid Solution ◽  
Niobium Pentoxide ◽  
Synthesis Parameters ◽  
Selection Of ◽  
Dense Films

The possibilities of synthesis of niobium pentoxide films by anodic oxidation were studied. The process parameters leading to the formation of coherent dense films were determined. Itwas shown that films with the thickness of 30 up to 400 nm can be obtained during the first 15 minutes of the process by varying the voltage.

Effects of Anodic Oxidation Process on Transmittance of Porous Alumina on Glass Substrate

2011 ◽  
Vol 179-180 ◽  
pp. 274-278
Author(s):  
Pei Tao Guo ◽  
Zhi Lin Xia ◽  
Yi Yu Xue ◽  
Li Xin Zhao ◽  
Rui Wu
Keyword(s):  
Oxalic Acid ◽  
Phosphoric Acid ◽  
Acid Solution ◽  
Anodic Oxidation ◽  
Glass Substrate ◽  
Porous Alumina ◽  
Oxalic Acid Solution ◽  
Normal Incidence ◽  
Phosphoric Acid Solution ◽  
Alumina Films

Aluminum films were deposited on glass substrate by electron beam heat evaporation, and porous alumina films with high transmittance were prepared by means of anodic oxidation under different anodizing conditions in oxalic acid solution or phosphoric acid solution respectively. Thus the morphology of these porous alumina films was characterized by different structural. he optical transmittance spectrum at normal incidence over the 300~1000nm spectra region were obtained by spectrophotometer, which shows, in visible and ultraviolet light region, the transmittance of porous alumina films prepared in oxalic acid solution is much better than that prepared in phosphoric acid solution. The SEM analysis results showed that the pores are circular and uniform in porous alumina prepared in oxalic acid but irregular and non-uniform in that prepared in phosphoric acid, which affected the surface roughness of alumina films.

Investigation of the Preparation of Anodized Nanoporous Alumina Array

2014 ◽  
Vol 887-888 ◽  
pp. 766-769 ◽  
Author(s):  
Huey Ling Chang ◽  
Chih Ming Chen ◽  
Chin Huang Sun ◽  
Jin Shyong Lin
Keyword(s):  
Anodic Oxidation ◽  
Self Assembly ◽  
Aluminum Surface ◽  
Nanostructured Film ◽  
Oxidation Treatment ◽  
Anodic Aluminum ◽  
Nanoporous Template ◽  
Anodic Oxidation Treatment ◽  
Stable Control

This study produced a regularly arranged membrane, called anodic aluminum oxide (referred AAO), by mean of anodic oxidation treatment. The structure of AAO can be molecular self-assembly and its pore size is consistent. Also, the manufacturing process cost is low. These properties make the AAO be a nanotemplate material. This study further created a high quality of nanostructured film by electrochemical mould with the design of electrolyzer. In addition, a uniform nanothin film was grown on the aluminum surface in the stable control of current and temperature according to the conditions of different anode treatment. This film can form a nanopore array which the diameter can be controlled the size ranging from 15 nm to 400 nm. As results, the study can produce nanoporous template for various aperture by mean of anodic oxidation.

Effects of initial concentration and irradiation dose to degradation of di butyl phthalate from phosphoric acid (30 % P2O5)

2018 ◽  
Vol 106 (11) ◽  
pp. 909-916
Author(s):  
Louisa Bounemia ◽  
Abdelhamid Mellah
Keyword(s):  
Organic Matter ◽  
Phosphoric Acid ◽  
Optimal Recovery ◽  
Γ Irradiation ◽  
Γ Radiation ◽  
Initial Concentration ◽  
First Order ◽  
First Order Kinetics ◽  
Butyl Phthalate

Abstract The pretreatment of the phosphoric acid is a stage of utmost importance leading to an optimal recovery of the uranium present in this acid. To this end, the degradation of the organic matter which obstructs considerably this recovery was tested by γ irradiation. This study lies within the scope of the radiation/matter interaction; concerning the use of the γ irradiator as proceed of phosphoric acid purification by the degradation of di butyl phthalate (DBP). Studies of the interaction of γ radiation with phosphoric acid solutions polluted by an organic matter concern the study of the influence of some parameters such as: dose rate (0.5–35 kGy), initial concentration (50–500 mg/L) of the pollutant, pH and % in P2O5 on the degradation of organic matter by γ irradiation. The reactions followed pseudo first order kinetics for different initial concentrations. The results made it possible to say that the degradation of di butyl phthalate by γ irradiation is dependent on the amount of the concentration of DBP and pH. The G-values decreased with absorbed doses, and increased with higher initial concentrations.Purification of phosphoric acid by γ radiation does not degrade the quality of this acid.

Electropolishing of horizontal copper cylinders in unstirred phosphoric acid solution

1978 ◽  
Vol 7 (4) ◽  
pp. 313-318 ◽  
Author(s):  
I.A.S. Mansour ◽  
G.H. Sedahmed ◽  
M.Z. El-Abd ◽  
A.M. Ahmed
Keyword(s):  
Phosphoric Acid ◽  
Acid Solution ◽  
Phosphoric Acid Solution
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