ORALS

SESSION: AdvancedMaterialsTueAM-R10	6th Intl. Symp. on New & Advanced Materials & Technologies for Energy, Environment, Health & Sustainable Development
Tue. 29 Nov. 2022 / Room: Saitong
Session Chairs: Paulo Assis; Session Monitor: TBA

11:30: [AdvancedMaterialsTueAM01] OS
Antifouling activity of natural seaweed products of the Brazilian coast. A review.
Camila Freitas De Araújo¹ ; Adriano Batista² ; Bernardo Da Gama³ ; Jorge Murta⁴ ; Paulo Assis⁵ ; ¹Federal University of Ouro Preto - UFOP/REDEMAT, Ouro Preto, Brazil; ²IFMG, Ouro Preto, Brazil; ³UFF, Niterói, Brazil; ⁴Federal University of Ouro Preto, Ouro Preto, Brazil; ⁵University of Ouro Preto / REDEMAT, Ouro Preto, Brazil;
Paper Id: 143 [Abstract]

The golden mussel (Limnoperna fortunei) is a species of bivalve mollusc introduced in Brazil via ballast water in the 1990s. Given the biological and ecological characteristics of the species, as well as the favorable environment in the country for its proliferation, the golden mussel has become an exotic invasive species that has caused several problems in the aquatic environment because of its ability to form colonies in structures. The species adheres on the surfaces by protein filaments, causing serious environmental, social and economic damages, provoking structural and functional alterations in the ecosystems and damages to the human activities.<br />The challenge presented consists of biological fouling combat through treating underwater surfaces with freshwater natural products, in particular those from red algae. Fouling control tends to arouse the interest of shipbuilders, marine vessel operators, fish farming in tanks and hydroelectric power plants. In Brazil, the chemical treatment against the incrustation of the golden mussel, for example, made only in three hydroelectric power plants in Minas Gerais, has annual cost of R$ 1,494,000.00 [1].<br />With the worldwide ban of TBT-based antifouling paints since 2008, alternative, environmentally safe treatments gain more appeal, considering the risk associated with the alternative products currently in use. Natural marine products have since been recognized as a promising alternative for the replacement of commercially used antifouling until the moment [2].<br />A selection of natural seaweed products with antifouling activity may provide effective results with little or no environmental impact compared to currently used products [3], while contributing to the understanding of ecological functions and mechanisms of metabolic production secondary. At least 18 different regulatory biocides are currently being used as an alternative to tributyltin free antifouling paints, but these also pose some threat to the aquatic environment. In fact, even biocide-free antifouling paints are toxic to marine organisms over a broad spectrum [4]. For this reason there is still an urgent demand for new low-impact anti-fouling products.<br />This article aims to disseminate this broad line of research and consolidate information about the potential of marine organisms as producers of secondary metabolites (natural products) with antifouling activity, in the light of scientific production.<br />Key words: Golden Mussel; red algae; anti-fouling products; secondary metabolites; tributyltin.

References:
REFERENCES:\n[1] CEMIG. Companhia Energética de Minas Gerais. O mexilhão Dourado, uma ameaça às águas e hidrelétricas brasileiras. Ed. CEMIG, Belo Horizonte, p. 24, 2014.\n[2] Bhadury, P.& Wright, P.C. (2004). Exploitation of marine algae: biogenic compounds for potential antifouling applications. Planta, v. 219, p. 561–578.\n[3] DA GAMA, B. A. P. et al. The Effects of Seaweed Secondary Metabolites on Biofouling. Biofouling, v. 18, n. 1, p. 13-20, 2002.\n[4] Löschau, M.&Krätke, R. (2005). Efficacy and toxicity of self-polishing biocide-free antifouling paints. Environmental Pollution, v. 138, p. 260–267.

SESSION: MetalsTueAM-R3	Dmitriev International Symposium (6th Intl. Symp. on Sustainable Metals & Alloys Processing)
Tue. 29 Nov. 2022 / Room: Arcadia 1
Session Chairs: Madali Naimanbayev; Session Monitor: TBA

12:45: [MetalsTueAM04] OL
Analysis Of Aluminum And Silica Inclusion In Low And High Carbon Steels
Igor Pereira¹ ; Paulo Assis² ; Gilberto Fernandes Lima³ ; Tiago Oliveira⁴ ; ¹Universidade Federal de Ouro Preto, Ouro Preto, Brazil; ²University of Ouro Preto / REDEMAT, Ouro Preto, Brazil; ³UEMG-Universidade do Estado de Minas Gerais, João Monlevade, Brazil; ⁴Redemat UFOP, Itabirito, Brazil;
Paper Id: 176 [Abstract]

Aiming at the development of increasingly special steels, the industry searches for a constant evolution in the control of its production processes. The demand for these steels has been growing constantly, as well as their requirements. The cleanliness is one of the most important requirements for high-performance steels. Therefore, non-metallic inclusions are one of the most studied associated problems in the steel industry. Non-metallic inclusions can cause exfoliation and cracking, impairing the mechanical properties of the steels and may even interrupt their manufacturing processes. Nonetheless, it is extremely important to carry out a metallic characterization of these inclusions, aiming at reducing or eliminating their deleterious effects. The inclusions of alumina and silica in samples of industrial steels with low (AISI 1020) and high (AISI 1070) carbon content were identified by Scanning Electron Microscope. Low and medium carbon steels showed inclusions that can drastically affect their mechanical properties. This paper presents its characterization, including the minimum in quantity, size, shape and dispersion of steel matrices used in the ASTM 45. It concluded that the market for these steels can be improved due to the characterization of these inclusions and the ways of their reduction.