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Thursday, 19 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Encapsulation and incorporation of sodium molybdate in polyurethane coatings

Thursday, 25 August 2016

Sodium molybdate was evaluated by Belgian researchers from Vrije Universiteit Brussel as corrosion inhibitor for steel in brackish water.

Sodium molybdate provides corrosion protection on steel in brackish water. Source: Egon Häbich/pixelio.de

Sodium molybdate provides corrosion protection on steel in brackish water. Source: Egon Häbich/pixelio.de

It was encapsulated by interfacial polymerisation and the produced capsules were characterised.

Coatings with capsules show improved corrosion performance

Electrochemical impedance spectroscopy and corrosion potential measurements were used to determine the short-time corrosion inhibition while polarisation curves were used for the estimation of the inhibition efficiency. The capsules composition, the Na2MoO4 content and the release rate are then determined. Na2MoO4 shows corrosion inhibition for at least 15 h. Capsules consist of polyurea and polyurethane which are formed due to the reaction of the isocyanates with the water of the emulsion and the used surfactants, respectively. Most of the inhibitor is released within 90 min. Electrochemical Impedance Spectroscopy and Scanning Vibrating Electrode Technique show corrosion inhibition on artificially damaged areas for the coatings containing the corrosion inhibitor capsules.

The study is published in: Surface and Coatings Technology, Volume 303, Part B, 15 October 2016, Pages 330–341

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