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Wednesday, 30 September 2020
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Raw materials & technologies, Applications, Protective & Marine coatings

Different anticorrosive paints evaluated

Tuesday, 27 July 2010

In a new study, the performance of different replacements for chromates was analysed. The anticorrosive properties of seven phosphate-based pigments, a calcium-exchange silica and a ferrite wereassessed by electrochemical techniques.

The anticorrosive performance of different paints was tested Source: KFM/Pixelio

The anticorrosive performance of different paints was tested Source: KFM/Pixelio

In a new study, the performance of different replacements for chromates was analysed. The anticorrosive properties of seven phosphate-based pigments, a calcium-exchange silica and a ferrite were assessed by electrochemical techniques and formulating solventborne paints with epoxy and alkyd resins. Paints contained 30 % by volume of anticorrosive pigment, with respect to the total pigment content. The anticorrosive performance of paints was evaluated by accelerated tests and electrochemical essays: Outdoor exposure tests were carried out in an urban-industrial environment during eight years. The anticorrosive performance of the tested paints showed that there is not a clear relationship between the laboratory tests and the outdoors exposition and that none of them by themselves can predict the behaviour of the paint under service. However, electrochemical essays with pigments may give an orientation about pigment performance in anticorrosive paints. The complete paper will appear in "Progress in Organic Coatings", Vol. 69, issue 1 (September 2010).

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