Study of epoxy and alkyd coatings modified with emeraldine base form of polyaniline

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• 作者：Elaine Armelin ; Cintia Ocampo ; Francisco Liesa ; José ; Ignacio Iribarren ; Xavier Ramis ; Carlos Alemá ; n
• 关键词：Corrosion ; Immersion test ; Conducting polymer ; Polyaniline ; Paint ; Additive
• 刊名：Progress in Organic Coatings
• 出版年：2007
• 出版时间：1 March 2007
• 年：2007
• 卷：58
• 期：4
• 页码：316-322
• 全文大小：423 K

文摘

In this work we examine the ability of the emeraldine base form of polyaniline to impart protection against corrosion when it is used as additive of commercial paints. For this purpose, three paints, which are used as primers in marine environments, were checked: two epoxy coatings that differ in the presence or absence of inorganic anticorrosive pigment (zinc) and one alkyd coating. In a first stage, the rheological, structural, thermal and mechanical properties of the three coatings were characterized using viscosity measurements, infrared spectroscopy, thermogravimetric analyses and stress–strain assays, respectively. Furthermore, we observed that the resulting properties were not altered by the addition of a low concentration of polyaniline (0.3 % , w/w). Accelerated corrosion tests were performed to compare the degree of protection of both the modified and unmodified paints. The polyaniline did not affect to the protective properties of the epoxy without inorganic anticorrosive pigment nor the alkyd formulations. In opposition, the polyaniline added to the epoxy paint with inorganic anticorrosive pigment induced the formation of a zinc oxide layer, which promoted the corrosion attack.