Иваново, Ивановская область, Россия
Ивановская пожарно-спасательная академия ГПС МЧС России
Иваново, Ивановская область, Россия
Иваново, Ивановская область, Россия
The article concerns with the possibility and properties of thin-layer anticorrosive ceramic coatings on low-alloyed 08kp steel - two-layer oxide-aluminium, oxide-silicon and two-component Al2O3-SiO2-coatings. In order to obtain the coatings by hydrolytic polycondensation of aluminium isopropoxide and tetraethoxysilane we prepared boehmite sols/gels with pH = 5 and 9 and hydrated silicon oxide with pH = 9 respectively. We made the mixtures of alumina gel and siliceous gel (pH = 9) in 1:4 and 4:1 ratios to obtain bicomponent coatings. These colloidal systems are characterised by pH-metry, particle size analysis and zeta-potential analysis. The morphology of the coatings includes the scanning electron microscopy. The results show that only the oxide-aluminium coatings have a homogeneous structure, while the SiO2- and Al2O3-SiO2-coatings after heat treatment have defects in the form of micro-crack meshes. The assessment of protective properties of the coatings was in a 3.5% sodium chloride solution at (231)C using electrochemical methods. Study contains the corrosion current densities calculations based on corrosion diagrams. Only single-component Al2O3-films and two-component films with high aluminium oxide content have a protective effect. Electrochemical impedance spectroscopy data modeled the metal-film-electrolyte interface using an equivalent electrical circuit. The work contains the calculations of the values of the circuit parameters and their variation as a function of sample exposure time. The oxide-aluminium films made from aluminogel with pH = 5 and two-component Al2O3-SiO2 films of 4:1 composition show the best results.
sol-gel, oxide coating, corrosion protection coating, structural steel, aluminium oxide, silicon oxide, potentiometry, electrochemical impedance spectroscopy
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