Abstract

The present paper focuses on the corrosion of austenitic (AISI304) and a duplex (2205) stainless steel grades in molten KOH/NaOH 50 w/o eutectic at 250°C. Experimental activities have been performed consisting in electrochemical measurements (linear sweep voltammetry and electrochemical impedance spectrometry) complemented by metallographic (in-plane and cross-sectional SEM micrography), structural (X-ray diffractometry) and compositional (EDX line-profiles) characterization of the materials attacked under electrochemically controlled conditions. Electrochemical measurements have shown that AISI304 exhibits a passivating behaviour, characterised by two passivation peaks and a transpassive threshold, while Duplex, does not yield a clear indication of passivation. AISI304 was found to fail by intergranular corrosion and to be covered in both passive and transpassive conditions, by an incoherent scale, containing electrolyte species. Duplex samples, instead tends to fail by homogeneous attack and exhibit a range of scale structures, depending on the applied potential.

Autore Pugliese

• Bozzini Benedetto , Scarselli Gennaro

Tutti gli autori

• B. Bozzini , S. Barella , F. Bogani , G. Giovannelli , S. Natali , G. Scarselli , M. Boniardi

Titolo volume/Rivista

MATERIALS AND CORROSION

Anno di pubblicazione

2012

ISSN

0947-5117

ISBN

Non Disponibile

Numero di citazioni Wos

6

Ultimo Aggiornamento Citazioni

24/04/2018

Numero di citazioni Scopus

7

Ultimo Aggiornamento Citazioni

24/04/2018

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile