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Sunday, 15 September 2019
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Raw materials & technologies, Applications

Hybrid organosiloxane coatings protect mild steel against corrosion

Tuesday, 12 July 2016

Hybrid organic-inorganic materials made from sol-gel precursors can be used as anticorrosion barriers on metal substrates. The modification of epoxy resins with silicones is an interesting approach toward the synthesis of those materials.

Source: Sarah Blatt/pixelio.de

Source: Sarah Blatt/pixelio.de

In this study, novel hybrid epoxy-silicon materials were synthesised using sol-gel chemistry and subsequently functionalised with 4,4′-methylenebis(phenyl isocyanate), incorporating urethane functionality into the final polymer.

Screening five different epoxide precursors

The study screened five different epoxide precursors for use in the synthesis of the new hybrid materials and optimising their anticorrosion properties. Spectral characterisation confirms the proposed chemical structures of the newly synthesised polymers. The newly developed polymers were painted on mild steel panels, thermally cured, and their thermal, surface morphological, adhesion, and anticorrosion properties were fully characterised. The new coatings were found to have excellent thermal stability and adherence properties to steel surface.

Bisphenol A diglycidyl ether shows best anticorrosion

The results of corrosion testing on coated steel panels following long-term immersion in a 3.5 wt % aqueous NaCl medium revealed that the polymer prepared using the epoxide precursor bisphenol A diglycidyl ether provided the best anticorrosion protection property among the synthesised polymers. This could be attributed to the excellent integrity and crosslink density properties in addition to the lack of microdefects in the surface of this coated sample as confirmed by scanning electron microscopy analyses. The newly prepared hybrid coatings reported in this study are very promising as an alternative to toxic chromate-based coatings.

The study is published in: Applied Polymer Science, Volume 133, Issue 38, October 10, 2016

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