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Advisor(s)
Abstract(s)
O mercado atual apresenta diversas soluções quando se pretende selecionar o material com
melhor enquadramento de especificações para uma aplicação concreta e o conhecimento das
vantagens e das desvantagens de cada opção é um fator diferenciador fundamental. Esse
conhecimento permite uma escolha mais informada e estratégica, impactando diretamente na
eficiência, sustentabilidade e custo-benefício em diferentes projetos. Sendo assim, uma análise
minuciosa das propriedades dos materiais, como resistência à corrosão, durabilidade,
resistência mecânica, impacto ambiental e facilidade de manutenção, é essencial para
assegurar que a seleção atenda não apenas às necessidades imediatas, mas, também, às
exigências a longo prazo.
Esta investigação é direcionada ao estudo e análise do comportamento dos aços inoxidáveis
austeníticos, em específico o AISI 304 e o AISI 316, em ambiente salino, sendo este fator crítico
para aplicações em zonas marítimas ou costeiras.
As condições de resistência em condições em que a temperatura é superior à temperatura
ambiente, os mecanismos de corrosão verificados e a sua intensidade foram correlacionados
com o teor de salinidade e foi discutida a influência da composição química como um dos
fatores diferenciadores entre estes dois tipos de aços inoxidáveis.
O software Image J foi utilizado como recurso para a análise quantitativa de corrosão superficial
a partir dos registos fotográficos realizados durante todo o programa experimental. Recorrendo
a esse software, zonas de corrosão foram identificadas e demarcadas. Adicionalmente, embora
ainda numa fase exploratória, a ferramenta foi utilizada para realizar estimativas de
profundidade de corrosão, método que uma vez validado, poderá ser de bastante utilidade na
avaliação da severidade do processo de corrosão. Além disso, o tratamento das imagens
permitiu validar a presença de corrosão após a pesagem das amostras, uma vez que foram
observadas zonas de corrosão na superfície das amostras.
Finalizados os ensaios, pode-se reconhecer que a presença de Mo contido no AISI 316 é capaz
de melhorar a resistência à corrosão em ambientes salinos, quando comparado com o AISI 304.
The current market offers various solutions when it comes to selecting the material with the best specification fit for a concrete application, and understanding the advantages and disadvantages of each option is a fundamental differentiating factor. This knowledge enables a more informed and strategic choice, directly impacting the efficiency, sustainability, and costbenefit of different projects. Thus, a thorough analysis of material properties, such as corrosion resistance, durability, mechanical strength, environmental impact, and ease of maintenance, is essential to ensure that the selection meets not only immediate needs but also long-term requirements. This investigation is focused on the study and analysis of the behavior of austenitic stainless steels, specifically AISI 304 and AISI 316, in a saline environment, which is a critical factor for applications in maritime or coastal areas. The resistance conditions at temperatures above room temperature, the corrosion mechanisms observed, and their intensity were correlated with the salinity content, and the influence of chemical composition was discussed as one of the differentiating factors between these two types of stainless steel. The software Image J was used as a resource for the quantitative analysis of surface corrosion from photographic records made throughout the entire experimental program. Using this software, corrosion zones were identified and demarcated. Additionally, although still in an exploratory phase, the tool was used to estimate corrosion depth, a method that, once validated, could be very useful in assessing the severity of the corrosion process. Furthermore, image processing allowed for the validation of corrosion presence after sample weighing, as corrosion zones were observed on the sample surfaces. Upon completion of the tests, it can be recognized that the presence of Mo contained in AISI 316 can improve corrosion resistance in saline environments compared to AISI 304
The current market offers various solutions when it comes to selecting the material with the best specification fit for a concrete application, and understanding the advantages and disadvantages of each option is a fundamental differentiating factor. This knowledge enables a more informed and strategic choice, directly impacting the efficiency, sustainability, and costbenefit of different projects. Thus, a thorough analysis of material properties, such as corrosion resistance, durability, mechanical strength, environmental impact, and ease of maintenance, is essential to ensure that the selection meets not only immediate needs but also long-term requirements. This investigation is focused on the study and analysis of the behavior of austenitic stainless steels, specifically AISI 304 and AISI 316, in a saline environment, which is a critical factor for applications in maritime or coastal areas. The resistance conditions at temperatures above room temperature, the corrosion mechanisms observed, and their intensity were correlated with the salinity content, and the influence of chemical composition was discussed as one of the differentiating factors between these two types of stainless steel. The software Image J was used as a resource for the quantitative analysis of surface corrosion from photographic records made throughout the entire experimental program. Using this software, corrosion zones were identified and demarcated. Additionally, although still in an exploratory phase, the tool was used to estimate corrosion depth, a method that, once validated, could be very useful in assessing the severity of the corrosion process. Furthermore, image processing allowed for the validation of corrosion presence after sample weighing, as corrosion zones were observed on the sample surfaces. Upon completion of the tests, it can be recognized that the presence of Mo contained in AISI 316 can improve corrosion resistance in saline environments compared to AISI 304
Description
Keywords
Stainless steel Saline test Corrosion Quantitative analysis Aço inoxidável austenítico Ensaio salino Corrosão Análise quantitativa