Characterisation by X-ray absorption near-edge spectroscopy of KMnO4-based no-rinse conversion coatings on Al and Al alloys

I Danilidis; Alison Davenport; JM Sykes

doi:10.1016/j.corsci.2006.09.001

Characterisation by X-ray absorption near-edge spectroscopy of KMnO4-based no-rinse conversion coatings on Al and Al alloys

I Danilidis, Alison Davenport, JM Sykes

Metallurgy and Materials

Research output: Contribution to journal › Article

9 Citations (Scopus)

Abstract

No-rinse conversion coatings based on KMnO4, were applied to aluminium alloys and pure aluminium, and examined with X-ray absorption near edge spectroscopy (XANES). Some specimens were prepared beforehand and other specimens were freshly prepared immediately before testing, so that early changes in the coatings could be studied. A significant difference in composition was found between the one-week old specimens and the fresh. The old specimens consisted predominantly of Mn oxides, while the fresh specimens contained a substantial proportion of KMnO4. When fresh specimens were rinsed with de-ionised water, soluble KMnO4 was removed and the spectrum now showed evidence for mixed oxides, but no KMnO4, like the older specimens. Monitoring of specimens after exposure to 0.5% NaCl solution showed little further change in the film. (c) 2006 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	1981-1991
Number of pages	11
Journal	Corrosion Science
Volume	49
Issue number	4
DOIs	https://doi.org/10.1016/j.corsci.2006.09.001
Publication status	Published - 1 Apr 2007

Keywords

pitting corrosion, oxide coating
XANES
alummium, manganese

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10.1016/j.corsci.2006.09.001

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title = "Characterisation by X-ray absorption near-edge spectroscopy of KMnO4-based no-rinse conversion coatings on Al and Al alloys",

abstract = "No-rinse conversion coatings based on KMnO4, were applied to aluminium alloys and pure aluminium, and examined with X-ray absorption near edge spectroscopy (XANES). Some specimens were prepared beforehand and other specimens were freshly prepared immediately before testing, so that early changes in the coatings could be studied. A significant difference in composition was found between the one-week old specimens and the fresh. The old specimens consisted predominantly of Mn oxides, while the fresh specimens contained a substantial proportion of KMnO4. When fresh specimens were rinsed with de-ionised water, soluble KMnO4 was removed and the spectrum now showed evidence for mixed oxides, but no KMnO4, like the older specimens. Monitoring of specimens after exposure to 0.5% NaCl solution showed little further change in the film. (c) 2006 Elsevier Ltd. All rights reserved.",

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T1 - Characterisation by X-ray absorption near-edge spectroscopy of KMnO4-based no-rinse conversion coatings on Al and Al alloys

AU - Danilidis, I

AU - Davenport, Alison

AU - Sykes, JM

PY - 2007/4/1

Y1 - 2007/4/1

N2 - No-rinse conversion coatings based on KMnO4, were applied to aluminium alloys and pure aluminium, and examined with X-ray absorption near edge spectroscopy (XANES). Some specimens were prepared beforehand and other specimens were freshly prepared immediately before testing, so that early changes in the coatings could be studied. A significant difference in composition was found between the one-week old specimens and the fresh. The old specimens consisted predominantly of Mn oxides, while the fresh specimens contained a substantial proportion of KMnO4. When fresh specimens were rinsed with de-ionised water, soluble KMnO4 was removed and the spectrum now showed evidence for mixed oxides, but no KMnO4, like the older specimens. Monitoring of specimens after exposure to 0.5% NaCl solution showed little further change in the film. (c) 2006 Elsevier Ltd. All rights reserved.

AB - No-rinse conversion coatings based on KMnO4, were applied to aluminium alloys and pure aluminium, and examined with X-ray absorption near edge spectroscopy (XANES). Some specimens were prepared beforehand and other specimens were freshly prepared immediately before testing, so that early changes in the coatings could be studied. A significant difference in composition was found between the one-week old specimens and the fresh. The old specimens consisted predominantly of Mn oxides, while the fresh specimens contained a substantial proportion of KMnO4. When fresh specimens were rinsed with de-ionised water, soluble KMnO4 was removed and the spectrum now showed evidence for mixed oxides, but no KMnO4, like the older specimens. Monitoring of specimens after exposure to 0.5% NaCl solution showed little further change in the film. (c) 2006 Elsevier Ltd. All rights reserved.

KW - pitting corrosion, oxide coating

KW - XANES

KW - alummium, manganese

U2 - 10.1016/j.corsci.2006.09.001

DO - 10.1016/j.corsci.2006.09.001

M3 - Article

VL - 49

SP - 1981

EP - 1991

JO - Corrosion Science

JF - Corrosion Science

IS - 4

ER -

Characterisation by X-ray absorption near-edge spectroscopy of KMnO4-based no-rinse conversion coatings on Al and Al alloys

Abstract

Keywords

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