کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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693023 | 1460528 | 2012 | 6 صفحه PDF | دانلود رایگان |
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.
► Fluorinated substituents of chitosan are suggested as protective films.
► Chitosan layer works as a reservoir for cationic Ce3+ corrosion inhibitor.
► Complexation of Ce3+ with chitosan amino groups prevents its uncontrollable and fast leaching.
► Ce-containing chitosan coatings were found to confer active corrosion protection toward aluminum alloy 2024.
Journal: Progress in Organic Coatings - Volume 75, Issues 1–2, September–October 2012, Pages 8–13