Name: Gustavo Fernandes Negris Lima
Type: MSc dissertation
Publication date: 30/08/2018

Namesort descending Role
Marcelo Camargo Severo de Macêdo Advisor *

Examining board:

Namesort descending Role
Eduardo Ariel Ponzio External Examiner *
Marcelo Camargo Severo de Macêdo Advisor *
ROMULO ALMEIDA COTTA External Examiner *
Temistocles de Sousa Luz Co advisor *

Summary: 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 DLEPR 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 were performed in a 33% H2SO4 solution + 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 of the 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 formation of phases such as secondary austenite and chromium nitrides.

Keywords: (DL-EPR); Stainless steel duplex; Sensitization; Dilution. UNS 39209

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