Chitosan-based self-healing protective coatings doped with cerium nitrate for corrosion protection of aluminum alloy 2024

被引：134

作者：

Carneiro, J. ^{[1
]}

Tedim, J. ^{[1
]}

Fernandes, S. C. M. ^{[2
]}

Freire, C. S. R. ^{[2
]}

Silvestre, A. J. D. ^{[2
]}

Gandini, A. ^{[2
]}

Ferreira, M. G. S. ^{[1
]}

Zheludkevich, M. L. ^{[1
]}

机构：

[1] Univ Aveiro, CICECO, Dept Engn Ceram & Vidro, P-3810193 Aveiro, Portugal

[2] Univ Aveiro, CICECO, Dept Quim, P-3810193 Aveiro, Portugal

来源：

PROGRESS IN ORGANIC COATINGS | 2012年 / 75卷 / 1-2期

关键词：

Cerium (III); Chitosan; Corrosion protection; Self-healing; AA2024; CHITIN; DEPOSITION;

D O I：

10.1016/j.porgcoat.2012.02.012

中图分类号：

O69 [应用化学];

学科分类号：

070301 [无机化学];

摘要：

The good film forming ability, specific solubility and versatile chemical functionalization of chitosan make it a promising candidate for "green" protective coatings. In the present work, these features are exploited together with chitosan high complexing ability to obtain inhibitor-containing anticorrosion coatings for active protection of aluminum alloys. The functionalization of chitosan with fluorinated substituents was also evaluated as a possible route to improve barrier and surface properties of the coating matrix. It was observed that the chitosan layer worked as a reservoir for cationic Ce3+ corrosion inhibitor due to the complexation of Ce3+ with chitosan amino groups, which prevents its uncontrollable and fast leaching. These Ce-containing coatings were found to confer active corrosion protection toward aluminum alloy 2024 as shown by electrochemical impedance spectroscopy. Moreover, the corrosion tests evidence the self-healing ability of prepared chitosan-based "green" protective coatings. The interaction between Ce3+ and chitosan and the concentration effect of the former on the performance of the latter from a corrosion standpoint is also discussed. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：8 / 13

页数：6

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