This work discusses the case of corrosion in a copper-nickel alloy used in seawater, where chlorination is necessary to control micro- and macro-organism growth that can render inoperable the seawater supply system used in an offshore platform. Studies developed in the last 30 years have shown copper-nickel’s adequateness in seawater, with a corrosion rate of about 0.001mm/year. However, annual equipment inspection showed localized corrosion in an internal chamber in a stand-by pump. Such corrosion occurred due to high-concentration of sodium hypochlorite (NaClO) injection into the operational system, even for pumps that were out of operation. To evaluate this corrosive process, gravimetric (mass loss) and electrochemical tests were developed in synthetic seawater with NaClO at concentrations of 100, 500, 1000 and 5000mg/L. The results indicated that the corrosiveness varied from low to moderate. The presence of pitting and crevices observed in the laboratory tests derails or compromises material use in seawater. It was concluded that there is a need for continuous monitoring of the NaClO injection in seawater pumps, and a method was proposed in order to minimize or avoid a high concentration of chlorine in standby pumps.
RESUMO: Este texto tem como propósito descrever a experiência no projeto de extensão Oficina de Arte-terapia no Programa Universidade para Terceira Idade, da Universidade Federal Fluminense - Polo Universitário de Campos dos Goytacazes. Trata-se de uma proposta que objetiva colaborar para o desenvolvimento do sentimento de autoeficácia e ampliação das interações de cidadãos idosos, usando o recurso da imaginação artística para promover o enfrentamento dos desafios vivenciados por eles nessa fase do curso de vida. No programa de trabalho são abordados temas como autoestima, amor, família, vida social, autonomia e projetos de futuro. São levadas em consideração várias linguagens e técnicas artísticas para resgate do lúdico na experiência do dia-a-dia, principalmente para ampliar a rede de sociabilidade da comunidade assistida. Ao final do projeto, as participantes consideraram a experiência positiva para o seu sentimento de autoeficácia. PALAVRAS-CHAVE: Arte. Autoestima. Autoeficácia. Sociabilidade. Idosos.
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