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Saturday, 21 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Smart corrosion sensing phenanthroline modified alkyd coatings

Monday, 7 December 2015

Results of a study revealed that phenanthroline modified alkyd resin can be used in coating formulations for the detection of corrosion.

Modified alkyd resin can be used in coating formulations for the detection of corrosion. Source: Wolfgang Staib/Fotolia.com

Modified alkyd resin can be used in coating formulations for the detection of corrosion. Source: Wolfgang Staib/Fotolia.com

Alkyd resin was chemically modified with 1,10-phenanthroline-5-amine and characterised by Fourier transform infrared (FTIR) and 13C Nuclear magnetic resonance (13C NMR) spectroscopy. The complex forming ability of phenanthroline modified alkyd resin with Fe2+ ions was studied by UV–Visible spectroscopy. Mixture of Fe2+ solution and modified alkyd resin showed new absorption bands in UV–Visible spectroscopy confirmed the formation of modified alkyd resin-Fe(II) complex.

Oberserving colour change

Corrosion sensing property of modified alkyd coating was evaluated by immersing the coated mild steel specimens in 3.5% NaCl solution. Colour change was observed in the coating due to onset of corrosion at metal-coating interface. Electrochemical impedance spectroscopy (EIS) was used for correlating the polarisation resistance (Rp) of coating with colour change. Scanning electron microscopic (SEM) analysis on the surface of metal specimens indicated that the point of colour change was the corrosion site. Results revealed that phenanthroline modified alkyd resin can be used in corrosion sensing coating formulations.

The study is published in: Progress in Organic Coatings, Volume 89, December 2015, Pages 8–16

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