Materials Transactions Online

Materials Transactions, Vol.58 No.02 (2017) pp.225-230
© 2016 The Japan Institute of Metals and Materials

Assessment of the Electrolyte Composition in the Degree of Sensitization in AISI 347H Stainless Steel

V. L. Cruz-Hernández1, M. A. García-Rentería2, R. García-Hernández1 and V. H. López-Morelos1

1Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo. Francisco J. Mujica S/N, Ciudad Universitaria, Building “U”, CP 58030, Morelia, Mich. México
2Facultad de Metalurgia, Universidad Autónoma de Coahuila, Carretera 57 km. 5 CP 25720, Monclova, Coahuila, México

This study evaluated the suitability of the depassivator in revealing low degrees of sensitization (DOS) in samples of wrought AISI 347H austenitic stainless steel in the as-received condition and solution heat treated (SHT) at 1050℃. Assessment of the electrolyte composition was performed by the double loop electrochemical potentiokinetic reactivation (DL-EPR) test at room temperature. The electrolyte 1.0M H2SO4 + 0.50M HCl was found to be adequate for detecting low DOS. Microstructural characterization of the as-received material revealed the presence of Cr-rich carbides. These carbides were responsible of the susceptibility to IGC.

[doi:10.2320/matertrans.M2016272]

(Received 2016/07/28; Accepted 2016/11/15; Published 2017/01/25)

Keywords: sensitization, austenitic stainless steel, AISI 347H, depassivator, double loop electrochemical potentiokinetic reactivation test

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