USE FRACTION OF SILTE AND CLAY FROM RED MUD FOR THE PRODUCTION OF ALUMINUM ALLOY CERAMIC COATINGS

Reference	Presenter	Authors (Institution)	Abstract
06-068	Carime dos Santos Souza	Souza, C.d.(Universidade Estadual Paulista “Júlio de Mesquita Filho” - SOROCABA); Antunes, M.L.(Universidade Estadual Paulista (UNESP), Instituto de Ciência e Tecnologia, Sorocaba); Cruz, N.C.(Universidade Estadual Paulista); Rangel, E.C.(Universidade Estadual Paulista); Conceição, F.T.(Universidade Estadual Paulista); Moraes, R.F.(Universidade Estadual Paulista (UNESP), Instituto de Ciência e Tecnologia, Sorocaba);	In order to achieve a cleaner production system, studies have been carried out to develop technologies that allow the use of tailings from the mining industry. Disposal of these wastes can cause a number of damages, as well as being potentially toxic if disposed of in uncontrolled areas. One such waste is the red mud from the processing of bauxite. This material is rich in Fe, Si, Ti and Al and because it is alkaline, with a high NaOH content, it can be recycled to obtain a ceramic coating of metals. Aiming at the use of this residue, this work proposes its use, separating in fractions of silt and clay, for the production and characterization, as protective coatings on aluminum alloy surfaces, through the technique of electrolytic oxidation assisted by plasma: plasma electrolytic oxidation (PEO)). PEO is a process where atmospheric plasma and conventional electrolysis are combined for the alteration of metallic surfaces in ceramic oxides. In this work, aluminum alloys 1200 were obtained using electrolytic solution prepared with fractions of red mud and distilled water in the concentration of 5 g/L. The red mud was separated in three different fractions with the aid of a 75 ?m sieve. The characterization of the red mud fractions was done by Scanning Electron Microscopy (SEM), X-ray Fluorescence (XRF), Picnometer Specific Mass, Thermal Analysis (ATD). The analysis of the composition of this red mud fraction shows that there is a predominance of Fe2O3 (30,86 %) and Al2O3 (30,1 %) and the specific mass of (3.26 ± 0.37) g/cm³. SEM analysis of the coatings obtained with this material allows the identification of pores and regions of coalescence and the composition found was O, C, Al, Fe, Si and Ti, by EDS. These coatings were also analyzed by X-ray diffraction (XRD) and evaluated for their roughness and wettability.
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