Magnetron-sputtered Al–Mg coatings – structural, microgravimetric and voltammetric characterisation in water, chloride and Cu(II) environment

Magnetron-sputtered Al–Mg coatings – structural, microgravimetric and voltammetric characterisation in water, chloride and Cu(II) environment

Al–Mg films were formed on glass and quartz substrates by magnetron sputtering technique using Al–5Mg casting alloy as a sputtering target. The content of elements in the films was similar to that of the sputtering target. The X-ray diffraction indicated a crystalline structure of the sputtered depo...

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Bibliographic Details
Published in:Electrochemistry communications Vol. 4; no. 10; pp. 747 - 752
Main Authors: Uksien≐, Virginija, Leinartas, Konstantinas, Jušk≐nas, Remigijus, Sudavičius, Aloyzas, Juzeliūnas, Eimutis
Format: Journal Article
Language:English
Published: Lausanne Elsevier B.V 01-10-2002
Amsterdam Elsevier Science
New York, NY
Subjects:
Aluminium–magnesium alloys
Applied sciences
Corrosion
Corrosion mechanisms
EQCM
Exact sciences and technology
Magnetron sputtering
Metals. Metallurgy
Magnetron sputtering
Aluminium–magnesium alloys
Corrosion
EQCM
Atomic force microscopy
Magnetron
X ray
Magnesium Alloys
Experimental study
Copper II Compounds
X ray diffraction
Sputtering
Aluminium Alloys
Surface structure
Corrosion resistance
Morphology
Photoelectron spectrometry
Saline solution
Binary alloy
Quartz microbalance
Sodium Chlorides
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Summary:Al–Mg films were formed on glass and quartz substrates by magnetron sputtering technique using Al–5Mg casting alloy as a sputtering target. The content of elements in the films was similar to that of the sputtering target. The X-ray diffraction indicated a crystalline structure of the sputtered deposits with pronounced 〈1 1 1〉 texture of Al. Initial corrosion stages of the coatings were studied in water, 3.5% NaCl and 3.5% NaCl + 50 ppm Cu(II) solution by electrochemical quartz crystal microbalance (EQCM). Microgravimetric measurements in water and NaCl solution indicated a perfect anticorrosive stability of the coatings. Copper inhibited corrosion during the first corrosion stages (t<1 min) whereas with the increase in immersion time the inhibition effect was reversed to strong corrosion acceleration. Atomic force microscopy (AFM) showed that copper deposits were similar in shape and size on both sputtered and cast alloys. Measurements of breakdown potentials indicated superiority of sputtered coatings with respect to the cast alloy in both NaCl and NaCl + Cu(II) solutions.
ISSN:1388-2481
1873-1902
DOI:10.1016/S1388-2481(02)00450-2