Corrosion Resistance of Low-Temperature and Conventional Plasma-Nitrided 410S Ferritic-Martensitic Stainless Steels

Autor(es)

Varela, L. B. ^{[1, 2]} ; Umemura, M. T. ^[1] ; Calderon-Hernandez, J. W. ^[1] ; Pinedo, C. E. ^[3] ; Kolawole, F. O. ^{[1, 4]} ; Tschiptschin, A. P. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Met & Mat Engn, Av Prof Mello Moraes 2463, BR-05508030 Sao Paulo, SP - Brazil

^[2] Inst Tecnol Vale, Juscelino Kubitschek Av 31, BR-35400000 Ouro Preto, MG - Brazil

^[3] Heat Tech Technol Heat Treatment & Surface Engn L, Av Joao XXIII 1160, BR-08830000 Mogi Das Cruzes, SP - Brazil

^[4] Fed Univ Oye Ekiti, Dept Mat & Met Engn, Oye Ekiti, Ekiti State - Nigeria

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS PERFORMANCE AND CHARACTERIZATION; v. 10, n. 1, p. 181-188, 2021.
• Citações Web of Science: 0

Resumo

Low-temperature plasma nitriding (LTPN) of 410S ferritic-martensitic stainless steel was carried out in a 75 % N-2 - 25 % H-2 gas mixture, at 400 degrees C, for 20 h. Conventional plasma nitriding (CPN) was also carried out in the same atmosphere but at 530 degrees C. The corrosion resistance was assessed by potentiodynamic polarization (PP) testing in 3.5-wt. % NaCl. Measuring of the mass loss was carried out after immersion of the specimens in a 3 % FeCl3 solution during 88 h. To define the sensitivity to intergranular corrosion, the degree of sensitization (DOS) was measured using the double-loop electrochemical PP technique (DL-EPR). DL-EPR results indicated that the potentiodynamic-polarization measurements showed that pitting corrosion resistance of the nitrided samples was enhanced, whereas the weight loss experiments showed that LTPN samples presented a corrosion resistance equal to the untreated samples. The DOS results displayed that the untreated samples were less resistant to intergranular corrosion correlated with the LTPN specimens. On the contrary, the CPN specimens exhibited typical behavior of general corrosion. (AU)

• Processo FAPESP: 17/25739-0 - Avaliação de propriedades tribológicas de fases expandidas formadas na superfície de aços inoxidáveis
• Beneficiário: Milena Tosti Umemura
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica