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

V. L. Cruz-Hernández; M. A. García-Rentería; R. García-Hernández; V. H. López-Morelos

doi:10.2320/matertrans.M2016272

This article has now been updated. Please use the final version.

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

V. L. Cruz-Hernández, M. A. García-Rentería, R. García-Hernández, V. H. López-Morelos

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

JOURNAL FREE ACCESS Advance online publication

Article ID: M2016272

DOI https://doi.org/10.2320/matertrans.M2016272

The final version of this article is now available: Vol. 58 (2017), No. 2 pp. 225-230

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Abstract

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.

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