Ivanovo, Ivanovo, Russian Federation
Ivanovo Fire and Rescue Academy of the Russian Ministry for Emergency Situations
Ivanovo, Ivanovo, Russian Federation
Ivanovo, Ivanovo, Russian Federation
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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