Avaliação da resistência à corrosão localizada de cladding de aço inoxidável duplex UNS S39209 em aço carbono pela técnica eletroquímica de reativação potenciodinâmica de ciclo duplo (DL-EPR)
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Data
2018-08-30
Autores
Lima, Gustavo Fernandes Negris
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Universidade Federal do Espírito Santo
Resumo
The study of welding coating deposition technology is necessary because it is widely used in industries, combining good mechanical characteristics and high resistance to corrosion at low cost, both with regard to the manufacturing process (cladding) and the process of recovery, through over thickness.In this work the results obtained by DL-EPR techniques were evaluated in terms of the susceptibility to localized corrosion of duplex stainless steel cladding UNS 39209. The relationship between welding energy, dilution and sensitization was also sought.DL-EPR assays wereperformed in a 33% H2SO4solution + 0.5% HCl by volume, and a scan rate of 1.5 mV / s, in order to quantify the level of sensitization after the TIG welding thermal cycle fed with cold wire.With the results obtained, it was concluded that the increase ofthe dilution rate of the coating and the welding energy, increase the degree of sensitization and, consequently, increase the susceptibility to localized corrosion. This fact can also be observed in the proportion of ferrite-austenite and in the formationof phases such as secondary austenite and chromium nitrides
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Stainless steel duplex , Sensitization , Dilution , Reativação potenciodinâmica eletroquímica de ciclo duplo (DL-EPR) , Sensitização , Diluição
Citação
LIMA, Gustavo Fernandes Negris. Avaliação da resistência à corrosão localizada de cladding de aço inoxidável duplex UNS S39209 em aço carbono pela técnica eletroquímica de reativação potenciodinâmica de ciclo duplo (DL-EPR). 2018. 79 f. Dissertação (Mestrado em Engenharia Mecânica) - Universidade Federal do Espírito Santo, Centro Tecnológico, Vitória, 2018.