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Monday, 14 October 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Efficient waterbased nano inorganic anticorrosive coatings designed

Thursday, 5 January 2012

Nano-coatings in a large range of PVC values attained very good performance

Efficient waterbased nano inorganic anticorrosive coatings designed Source: Fotolia/Raimundas

Efficient waterbased nano inorganic anticorrosive coatings designed Source: Fotolia/Raimundas

The aim of this study of researchers from the Universidad Tecnologica Nacional in Argentina was to develop environmentally friendly, nano-structured inorganic coatings suitable for the protection of metal substrates. The formulation variables included the following. First of all two binders based on lithium silicate of 7.5/1.0 silica/alkali molar ratio (one of them a commercial colloidal solution, and the other a laboratory-prepared nanosolution). Furthermore eight pigment compositions based on two spherical microzinc alone (D 50/50 4 and 8 μm) and mixed with spherical nanozinc in three microzinc/nanozinc (w/w) ratios (90/10, 80/20 and 70/30) were used. Finally the researchers tested six values of pigment volume concentration, PVC (from 47.5 to 70.0%) . The electrode potentials were measured in sodium chloride solution at 25 °C and pH 7.0 during 70 days to establish the evolution of cathodic protection. Additionally the researchers exposed panels in salt spray (fog) chamber to determine the degree of rusting and in 100 % relative humidity to evaluate the blistering resistance.
The conclusion is that the variables alkaline silicate type, pigment composition and PVC values exhibited an important influence on the anticorrosive efficiency. The target of a very good performance was achieved with the nano-structured inorganic binder at 7.5/1.0 SiO2/Li2O molar ratio and the fine spherical microzinc D 50/50 4 μm modified with nanozinc. The nanozinc showed similar efficiency for 80/20 and 70/30 microzinc/nanozinc, w/w, ratios. The researchers achieved these results in a wide range of PVC values from 52.5 to 65.0 % and from 47.5 to 60.0%, respectively. This study was published in Prorgress in Organic Coatings Volume 73, Issues 2-3, February-March 2012, pages 178-185.

Find the abstract of the study online here

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