Effect of sulphate impurity in chromic acid anodizing of aluminium

D. Elabar; A Němcová; T. Hashimoto; P. Skeldon; G.E. Thompson

doi:10.1016/j.corsci.2015.08.019

Effect of sulphate impurity in chromic acid anodizing of aluminium

D. Elabar, A Němcová, T. Hashimoto, P. Skeldon, G.E. Thompson

Research output: Contribution to journal › Article › peer-review

Abstract

The formation of porous anodic alumina during potentiostatic anodizing of aluminium for times up to 900 s has been investigated using two grades of chromic oxide reagent. The anodic films were examined by ion beam analysis and scanning and transmission electron microscopies. Sulphate impurity in the chromic acid led to incorporation of sulphate into the anodic film, a lower current density, a smaller cell size and less feathering of the pore walls. In addition, the efficiency of film formation was increased. The sulphate concentration in the film was greatly enhanced relative to the electrolyte.

Original language	English
Pages (from-to)	377-385
Number of pages	8
Journal	Corrosion Science
Volume	100
DOIs	https://doi.org/10.1016/j.corsci.2015.08.019
Publication status	Published - Nov 2015

Keywords

A. Aluminium; B. RBS; B. SEM; B. TEM; C. Anodic films

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10.1016/j.corsci.2015.08.019

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title = "Effect of sulphate impurity in chromic acid anodizing of aluminium",

abstract = "The formation of porous anodic alumina during potentiostatic anodizing of aluminium for times up to 900 s has been investigated using two grades of chromic oxide reagent. The anodic films were examined by ion beam analysis and scanning and transmission electron microscopies. Sulphate impurity in the chromic acid led to incorporation of sulphate into the anodic film, a lower current density, a smaller cell size and less feathering of the pore walls. In addition, the efficiency of film formation was increased. The sulphate concentration in the film was greatly enhanced relative to the electrolyte.",

keywords = "A. Aluminium; B. RBS; B. SEM; B. TEM; C. Anodic films",

author = "D. Elabar and A N{\v e}mcov{\'a} and T. Hashimoto and P. Skeldon and G.E. Thompson",

year = "2015",

month = nov,

doi = "10.1016/j.corsci.2015.08.019",

language = "English",

volume = "100",

pages = "377--385",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Effect of sulphate impurity in chromic acid anodizing of aluminium

AU - Elabar, D.

AU - Němcová, A

AU - Hashimoto, T.

AU - Skeldon, P.

AU - Thompson, G.E.

PY - 2015/11

Y1 - 2015/11

N2 - The formation of porous anodic alumina during potentiostatic anodizing of aluminium for times up to 900 s has been investigated using two grades of chromic oxide reagent. The anodic films were examined by ion beam analysis and scanning and transmission electron microscopies. Sulphate impurity in the chromic acid led to incorporation of sulphate into the anodic film, a lower current density, a smaller cell size and less feathering of the pore walls. In addition, the efficiency of film formation was increased. The sulphate concentration in the film was greatly enhanced relative to the electrolyte.

AB - The formation of porous anodic alumina during potentiostatic anodizing of aluminium for times up to 900 s has been investigated using two grades of chromic oxide reagent. The anodic films were examined by ion beam analysis and scanning and transmission electron microscopies. Sulphate impurity in the chromic acid led to incorporation of sulphate into the anodic film, a lower current density, a smaller cell size and less feathering of the pore walls. In addition, the efficiency of film formation was increased. The sulphate concentration in the film was greatly enhanced relative to the electrolyte.

KW - A. Aluminium; B. RBS; B. SEM; B. TEM; C. Anodic films

U2 - 10.1016/j.corsci.2015.08.019

DO - 10.1016/j.corsci.2015.08.019

M3 - Article

SN - 0010-938X

VL - 100

SP - 377

EP - 385

JO - Corrosion Science

JF - Corrosion Science

ER -

Effect of sulphate impurity in chromic acid anodizing of aluminium

Abstract

Keywords

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