Synergistic effect of V and Mn oxyanions for the corrosion protection of anodized aerospace aluminum alloy

Yoganandan, G and Balaraju, JN (2014) Synergistic effect of V and Mn oxyanions for the corrosion protection of anodized aerospace aluminum alloy. Surface and Coatings Technology, 252. pp. 35-47. ISSN 0257-8972

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Official URL: http://dx.doi.org/10.1016/j.surfcoat.2014.04.062

Abstract

In the present study sulphuric acid anodized oxide layer was sealed with permanganate (MnO) and permanganate–vanadate (MnVO) ions. The effect of the incorporation of these oxyanions on the corrosion performance of plain oxide layer (PO) was investigated by various characterization techniques such as field emission scanning electron microscopy (FESEM), energy dispersive X-ray analysis (EDAX), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The barrier layer resistance value of plain oxide layer was increased about 13 times due to the incorporation of mixed Mn–V oxyanions. The damage function (D) calculations revealed the self-healing mechanism of MnVO. The potentiodynamic polarization results showed higher corrosion inhibition performance of MnVO compared to that of MnO even after 336 h of immersion in 3.5% (0.6 M) NaCl solution. No sign of visible corrosion products were observed on MnVO surface even after 2000 h of continuous salt spray exposure.

Item Type: Article
Additional Information: Copyright to this article belongs to M/s. Elsevier Publisher
Uncontrolled Keywords: AA2024 alloy;EIS;Anodization;XPS;Raman spectroscopy;Sealing of anodized layer
Subjects: AERONAUTICS > Aeronautics (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 16 Jun 2015 07:40
Last Modified: 16 Jun 2015 07:40
URI: http://nal-ir.nal.res.in/id/eprint/12155

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