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Tuesday, 20 October 2020
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Raw materials & technologies, Applications

Formulation of a smart eco-friendly anti-corrosive powder coating

Tuesday, 22 September 2020

Scientists describe a polyester-epoxy resin/conducting polymer/barium sulfate hybrid composite as an eco-friendly anti-corrosive powder coating.

The composites achieved impressive and high performance effects in protecting steel panels from corrosion. Image source: blende11.photo – stock.adobe.com (symbol image).
The composites achieved impressive and high performance effects in protecting steel panels from corrosion. Image source: blende11.photo – stock.ado...

This polymer composites presented in the study represent high efficient anti-corrosive coatings based on (toluidines and phenylenediamines) /BaSO4 polymer composites for steel protection.

These polymer composites were prepared by in-situ chemical oxidative polymerisation of (ortho, meta or para) toluidines and phenylenediamines monomers each alone in the presence of BaSO4 extender pigment. The polymerisation process was carried out using ammonium peroxydisulphate as an initiator at 0-5 °C. The prepared composites were characterized using spectrophotometric measurements (FTIR, XRD, EDX, SEM), in addition to thermal analysis (DSC & TGA).

High performance effect in protecting steel panels

Small doses of these composites (not exceed 2%) were incorporated into powder coating formulations. The coating formulations including the (toluidines or phenylenediamines / BaSO4) polymer composites were evaluated as corrosion inhibitors. The coated steel panels were examined in a salt spray cabinet for 1500 h with a continuous follow up every 200-300 h.

The coating formulations containing conducting polymer/BaSO4 composites achieved impressive and high performance effects in protecting steel panels from corrosion compared with the blank sample. Moreover, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarisation results also confirmed the high performance corrosion protection properties of polyester/epoxy/conducting polymers/BaSO4 hybrid composites.

The study can be found in Progress in Organic Coatings, Volume 144, July 2020.

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