Surface Properties of Coatings Based on Iron Amino-Functionalized Oxides Deposited on Dh 36 Steel Plates for Shipbuilding

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Abstract
Nowadays, the development of eco-friendly paint formulations is part of the transition process to more sustainable materials, which involves many industrial fields such as offshore and shipbuilding where the deterioration of steel in seawater is a key factor. This article aims to produce suitable innovative coatings and test their protective action on DH 36 steel plates. Commercially available SiO2 and TiO2 were covalently modified with amino groups allowing two organic-inorganic hybrid materials for the immobilization of iron sites. The obtained powders were characterized by thermogravimetric analysis, N2 physisorption, X-ray diffraction, and X-ray photoelectron spectroscopy. Fe-based solids were used as filler for the design of ecological paint formulations which, in turn, were applied on the surface of metal prototype plates. The surface properties of the resulting coatings were examined by determination of thickness, water wettability, roughness, and cross-cut adhesion tests (before and after degradation test in seawater according to ASTM D 870-97 standard). Preliminary tests of the microbiological activity of the iron amino functionalized materials were carried out monitoring, as proof of concept, the growth of some bacterial strains through measurements of optical density.

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