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- Title
Corrosion resistance and self-repairing behaviour of Cr(III) contained conversion coating on AA2024-T3.
- Authors
Song, L. L.; Li, J. F.; Cai, C.
- Abstract
A Cr(III) contained conversion coating on AA2024-T3 was prepared in solution containing Cr2(SO4)3and K2ZrF6. Its composition was analysed using X-ray photoelectron spectroscopy, and its corrosion resistance was characterised by electrochemical measurements and neutral salt spray exposure. To investigate its self-repairing effect, the coupling current between a small uncoated sample and a large coated sample was monitored through an artificial scratch cell. The coating mainly consists of zirconium oxide and chromium oxide and hydroxide; no Cr(VI) species is detected. It improves the corrosion resistance by hindering the anodic process as well as the cathodic process. Meanwhile, it possesses self-repairing effect, which is generated from the release of Cr(III) species from the coating, migration and then deposition on the nearby scratch area.
- Subjects
CORROSION resistance; SPECTRUM analysis; SODIUM salts; ZIRCONIUM oxide; ATOMIC emission spectroscopy
- Publication
Corrosion Engineering, Science & Technology, 2016, Vol 51, Issue 4, p263
- ISSN
1478-422X
- Publication type
Article
- DOI
10.1179/1743278215Y.0000000053