This investigation focuses mainly on applied and fundamental research in a very relevant and important area - the corrosion protection of the most widely used metal materials such as structural steels. The latter are often subject to serious corrosion attacks, resulting in a number of economical damages, energy and material losses. The main objective is to create effective protective corrosion-resistant coatings or coating systems of various types on steel by: (1) Forming innovative sol-gel coatings [1] for galvanized steel - doped and /or undoped oxide coatings (single or multi-component), applied sequentially on galvanized steel at different thicknesses of the zinc coating; (2) Obtaining hybrid zinc coatings [2-4] with embedded polymeric based particles or corrosion inhibitors into the metal matrix; and (3) Developing environmentally friendly conversion coatings for galvanized steel [4]. Present investigations demonstrate some general ideas and possibilities for improving the protective properties of the ordinary zinc coatings by applying of materials which are non-toxic and non-harmful to the environment. The experimental techniques and apparatus used to achieve the end goals are: electrochemical methods for characterizing the protective properties (PD curves, polarization resistance - Rp, electrochemical impedance spectroscopy - EIS), XRD analysis, XPS analysis, SEM, TEM, etc.
Keywords:
Coatings; Composites; Metal; Nanoscience; Sol-Gel;References:
REFERNCES:
1. Stambolova I., Dimitrov O., Vassilev S., Yordanov St., Blaskov V., N Boshkov., Shipochka M., “Preparation of newly developed CeO2/ZrO2 multilayers: Effect of the treatment temperature on the structure and corrosion performance of stainless steel”, Journal of Alloys and Compounds, 806, 1357-1367, 2019.
2. Boshkova N., Tabakova N., Atanassova G., Boshkov N., “Electrochemical obtaining and corrosion behavior of Zinc-Polyaniline (Zinc-PANI)hybrid coatings”, Coatings, 9, 8, 487, 2019.
3. Kamburova K., Boshkova N., Boshkov N., Atanassova G., Radeva Ts., “Hybrid zinc coatings for corrosion protection of steel using polyelectrolyte nanocontainers loaded with benzotriazole”, Colloids and Surfaces A, 559, 243-250, 2018.
4. Peshova M., Bachvarov V., Vitkova S., Atanasova G., Boshkov N., “Electrodeposited zinc composite coatings with embedded carbon nanotubes – advanced composite materials for better corrosion protection”, Transactions of IMF, 96, 6, 324-331, 2018.The use of refractory materials is fundamental in steel mills due to the equipment used in the process of working under high temperatures [1]. For this equipment to perform well and mitigate damage, it is necessary to be coated with appropriate refractory materials so that they are thermally insulated. When rolling hot strips, plate reheating ovens generally use refractories (walls, ceilings, sills, doors, stringers, poles, etc.) [2]. The detonating doors of these ovens require special attention because they are in an aggressive, high-temperature environment [3]. The dry door is an alternative to replace refrigerated doors, to eliminate the recurrent problems of these, with leaks and frequent maintenance, and increase the life of the deformation doors. The use of dry door in reheating ovens of Arcelor Mittal has been advantageous, a study on its application and lifetime shows the efficiency of this port concerning others used.
Keywords:
Ceramic; Industry; Insulators; Materials;References:
[1]ABCERAM. Associação Brasileira de Cerâmica. Disponível em: . Acesso em: 07 de abril de 2020.
[2]ALVES, G.S.; DUARTE, A.K.; LINS, V. de F.C.; SILVA, D.G. de M. Metodologia para previsão da vida útil de âncoras refratárias aplicadas em fornos de reaquecimento. Matéria (Rio J.). v.21, n.4, pp.906-920, 2016. Disponível em: .
[3]NETO, E.F.M. Análise da Confiabilidade do Laminador de Tiras a Quente da Arcelor Mittal Tubarão. 2017. 43f. Monografia de Especialização (Especialização em Engenharia da Confiabilidade) – Departamento Acadêmico de Eletrotécnica, Universidade Tecnológica Federal do Paraná. Curitiba, 2017.
