Corrosion Resistance Evaluation of Nanostructured Oxide Ceramic Coatings Obtained by Microarc Oxidation

This article provides the results of corrosion resistance tests of nanostructured oxide-ceramic coatings produced by microarc oxidation on aluminum alloys in a boric acid electrolyte. The coatings were formed on a microarc oxidization plant used in anode-cathode mode. Accelerated corrosion tests wer...

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Bibliographic Details
Published in:Steel in translation 2023-06, Vol.53 (6), p.493-497
Main Authors: Kuznetsov, Yu. A., Kravchenko, I. N.
Format: Article
Language:English
Subjects:
Accelerated tests
Aluminum alloys
Aluminum base alloys
Ceramic coatings
Ceramic glazes
Ceramics
Chemical composition
Chemistry and Materials Science
Corrosion resistance
Corrosion tests
Electrolytes
Materials Science
Nanostructure
Oxidation resistance
Protective coatings
Sodium chloride
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Summary:This article provides the results of corrosion resistance tests of nanostructured oxide-ceramic coatings produced by microarc oxidation on aluminum alloys in a boric acid electrolyte. The coatings were formed on a microarc oxidization plant used in anode-cathode mode. Accelerated corrosion tests were conducted by alternating the immersion of the specimens in sodium chloride solution with their drying in the air. At the microarc oxidation of aluminum alloys in a boric acid electrolyte, the corrosion levels directly depend on microarc oxidation mode and chemical composition of oxidated alloys. At a density of 10–20 A/dm 2 , continuous corrosion is observed, whereas at a current density of 20–30 A/dm 2 staining is observed, which is caused by the fact that corrosive medium penetrates through the pores and produces poultice corrosion. The oxide ceramic coatings on D16 alloys exhibit a weaker resistance to corrosion than on AMg2 and AD1 alloys. It has been established that the corrosion values of aluminum alloys with nanostructured oxide-ceramic coatings are severalfold as low as in uncoated alloys.
ISSN:0967-0912
1935-0988
DOI:10.3103/S0967091223060074