Title: Identification of corrosion mechanisms on 13% Cr martensitic stainless steel in thiosulphate containing chloride solution by acoustic emission technique

Authors: Luigi Calabrese; Massimiliano Galeano; Edoardo Proverbio

Addresses: Department of Engineering, University of Messina, Contrada di Dio, 98166 Sant'Agata – Messina, Italy ' Department of Engineering, University of Messina, Contrada di Dio, 98166 Sant'Agata – Messina, Italy ' Department of Engineering, University of Messina, Contrada di Dio, 98166 Sant'Agata – Messina, Italy

Abstract: The use of brine containing thiosulphate solution to simulate the sour gas environment was recently evaluated in the scientific literature to overcome the problems related to H₂S use for laboratory testing of corrosion-resistant alloy (CRA) for Oil and Gas industry. However, corrosion attacks on stainless steel alloys are strongly influenced by thiosulphate to chloride concentration ratio. The identification of a reliable non destructive monitoring technique that can allow to distinguish between the different corrosion mechanisms is a big issue and it is the main aim of the present paper. Corrosion behaviour under tensile load of 13% Cr martensitic stainless steel in a modified NACE TM0177 standard solution at room temperature in presence of thiosulphate ions at different concentration (from 10^-3 to 10^-1 M) was evaluated by acoustic emission technique. By microstructural observations and a bivariate analysis it was possible to evidence how some acoustic emission patterns can clearly identify specific corrosion mechanisms.

Keywords: acoustic emission; thiosulphate; pitting; stress corrosion cracking.

DOI: 10.1504/IJMMP.2018.097781

International Journal of Microstructure and Materials Properties, 2018 Vol.13 No.6, pp.403 - 418

Received: 21 Feb 2018
Accepted: 07 Aug 2018
Published online: 09 Feb 2019 *

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