Corrosion Assessment of ASME Qualified Welding Procedures for Grade 2101 Lean Duplex Stainless Steel

Autor(es)

Guilherme, L. H. ^{[1, 2]} ; Reccagni, P. ^[3] ; Benedetti, A. V. ^[1] ; Fugivara, C. S. ^[1] ; Engelberg, D. L. ^{[3, 4]}

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Chem Inst, BR-14800900 Araraquara - Brazil

^[2] Soudap Engn Co, BR-14803655 Araraquara - Brazil

^[3] Univ Manchester, Sch Mat, Corros & Protect Ctr, Manchester M13 9PL, Lancs - England

^[4] Univ Manchester, Sch Mat, Mat Performance Ctr, Manchester, Lancs - England

• Tipo de documento: Artigo Científico
• Fonte: CORROSION; v. 75, n. 10, p. 1216-1229, OCT 2019.
• Citações Web of Science: 1

Resumo

ASME qualified welding procedures do not guarantee suitable corrosion and passivation properties for lean duplex stainless steel welds. An evaluation of two ASME qualified welding procedures to optimize the corrosion performance of tungsten inert gas (TIG) welded grade 2101 duplex stainless steel using ER2209 weld consumable was conducted. The evolution of the microstructure was examined by optical and electron microscopy, ferrite-scope measurements, and scanning Kelvin probe force microscopy. An electrochemical mini-cell was then used to characterize the electrochemical behavior of different weld regions using the techniques such as the double loop electrochemical potentiokinetic reactivation test, standard potentiodynamic polarization tests, and cyclic potentiodynamic polarization. The fusion line was the most critical zone for localized corrosion for both welding procedures, due to the formation of Cr- and Mo-depleted zones, resulting in the highest degree of sensitization. The best performance was attributed to the weld face, due to the presence of higher Cr and Mo contents, highlighting the pitting corrosion resistance. A heat input range of 1.6 kJ/mm to 1.9 kJ/mm and low current density (WPS 1) indicated better corrosion performance of all weld regions. The electrochemical corrosion response was in all cases related to microstructural characteristics of the weld regions. The influence of weld parameters on microstructure development and corrosion performance is discussed. (AU)

• Processo FAPESP: 16/08439-0 - Projeto e desenvolvimento de uma microcélula eletroquímica portátil para controle de qualidade de instalações industriais com requisitos de resistência á corrosão e assepsia
• Beneficiário: Luis Henrique Guilherme
• Linha de fomento: Auxílio à Pesquisa - Pesquisa Inovativa em Pequenas Empresas - PIPE