Soluble polythiophenes as anticorrosive additives for marine epoxy paints

This study compares the resistance against corrosion of a marine epoxy primer modified with Zn3(PO4)2 (10 wt%) or a small concentration (0.3 wt%) of conducting polymer (CP) as inorganic or organic anticorrosive pigment, respectively. More specifically, the behavior of three different CPs has been ev...

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Bibliographic Details
Published in:Materials and corrosion 2015-01, Vol.66 (1), p.23-30
Main Authors: Martí, M., Armelin, E., Iribarren, J. I., Alemán, C.
Format: Article
Language:English
Subjects:
Additives
anticorrosive paints
conducting polymer
Conducting polymers
Corrosion
Corrosion and anti-corrosives
Corrosion prevention
Corrosion resistance
Corrosió i anticorrosius
Derivatives
Enginyeria química
epoxy resin
Esters
mechanical properties
Paints
Polímers conductors
Protective coatings
R&D
Research & development
thermal stability
Àrees temàtiques de la UPC
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Summary:This study compares the resistance against corrosion of a marine epoxy primer modified with Zn3(PO4)2 (10 wt%) or a small concentration (0.3 wt%) of conducting polymer (CP) as inorganic or organic anticorrosive pigment, respectively. More specifically, the behavior of three different CPs has been evaluated: polyaniline (PAni) emeraldine base, poly(3‐thiophen‐3‐yl‐acrylic acid methyl ester) and poly(2‐thiophen‐3‐yl‐malonic acid dimethyl ester), the latter two being soluble polythiophene (PTh) derivatives bearing carboxylate side groups. In a first stage, the structural, thermal, and mechanical properties of all the modified epoxy coatings were characterized using infrared spectroscopy, thermogravimetric analyses and stress–strain assays, respectively. After this, accelerated corrosion assays have evidenced that the degree of protection imparted by a small concentration of PAni is higher than that obtained using 10 wt% of Zn3(PO4)2. Indeed, PAni has been found to be more effective as anticorrosive additive than the two PTh derivatives. This fact has been attributed to the electroactivity of the former, which is higher than that of the latter. Thus, the ability to store charge has been proposed to be also responsible of protection against corrosion imparted by organic additives, based on CPs.
ISSN:0947-5117
1521-4176
DOI:10.1002/maco.201307132