Performance of lanthanum 4-hydroxycinnamate in a polyurethane coating in simulated seawater - Exposed cement solution

MacLeod, Alastair and Catubig, Rainier 2020, Performance of lanthanum 4-hydroxycinnamate in a polyurethane coating in simulated seawater - Exposed cement solution, in Corrosion and Prevention 2019, Australian Corrosion Association, Melbourne, Australia.

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Title Performance of lanthanum 4-hydroxycinnamate in a polyurethane coating in simulated seawater - Exposed cement solution
Author(s) MacLeod, AlastairORCID iD for MacLeod, Alastair
Catubig, Rainier
Conference name Corrosion and Prevention 2019
Conference location Melbourne, Australia
Conference dates 2019/11/24 - 2019/11/27
Title of proceedings Corrosion and Prevention 2019
Publication date 2020
Publisher Australian Corrosion Association
Place of publication Melbourne, Australia
Summary Ingress of chloride ions through the pore network of concrete towards embedded streel reinforcement can result in pitting corrosion and, if left unchecked, to reinforcement corrosion. Considering the cost of repairing and replacing damaged concrete structures in coastal zones, rebar coatings incorporating corrosion inhibitors may provide a cost-effective method to significantly extend service life. Rare earth compound-based corrosion inhibitors, such as lanthanum 4-hydroxycinnamate (La(4OHCin)3), have demonstrated effective corrosion inhibition on mild steels under neutral pH conditions. To date, limited research has investigated the performance of La(4OHCin)3 within coatings under high pH conditions, such as those found in reinforced concrete in seawater-exposed environments. In this preliminary study, the inhibitor La(4OHCin)3 was incorporated into a polyurethane-based coating and painted over the polished cross section of mild steel (AS1020) round bar specimens mounted in epoxy. A 5 mm artificial scribe was made on each sample and subsequently immersed in simulated seawater-exposed cement pore solution (0.6 M sodium chloride and saturated calcium hydroxide) for several days. Time lapse optical microscopy (showing the progression of corrosion), polarization resistance measurements (monitoring the electrochemical behaviour) and surface characterization with SEM/EDX were conducted to compare the relative performance of the REM-based inhibitor with the uninhibited polyurethane control coating. Results demonstrate that the La(4OHCin)3 incorporated into a polyurethane-based coating provides effective corrosion inhibition in the high pH and high salt environment of the simulated exposed cement solution.
Language eng
Indigenous content off
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 870303 Polymeric Materials (e.g. Paints)
HERDC Research category E1 Full written paper - refereed
Copyright notice ©2019, Corrosion and Prevention
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