Sensor development for corrosion monitoring of stainless steels in H2SO4 solutions

Miha Hren (Author), Tadeja Kosec Mikić (Author), Mari Lindgren (Author), Elina Huttunen-Saarivirta (Author), Andraž Legat (Author)

Abstract

Equipment made of different stainless steels is often used in the hydrometallurgical processing industry. In this study, an electrical resistance sensor was developed for monitoring corrosion in acidic solutions at high temperature. Two types of stainless steel were used as the electrode materials, namely grade 316L stainless steel (EN 1.4404) and grade 2507 duplex stainless steel (EN 1.4410). The materials and sensors were exposed to a 10% H2SO4 solution containing 5000 mg/L of NaCl at various temperatures. Results from the sensors were verified using electrochemical techniques and postexposure examination. Results showed that the microstructure played an important role in the interpretation of corrosion rates, highlighting the importance of using an appropriate stainless steel for the production of sensors. Electrochemical tests and postexposure examination both showed that the grade 2507 had a significantly lower corrosion rate compared to the grade 316L. Under industrial‑process conditions, the results for the grade 2507 sensor were promising with respect to sensor durability and performance, despite the extremely harsh operating environment.

Keywords

nerjavno jeklo;hidrometalurška industrija;žveplova kislina;uporovni senzor;korozija;odprti dostop;stainless steel;hydrometallurgical industry;sulphuric acid;electrical resistance sensor;corrosion;open access;

Data

Language:	English
Year of publishing:	2021
Typology:	1.01 - Original Scientific Article
Organization:	ZAG - Slovenian National Building and Civil Engineering Institute
Publisher:	MDPI
UDC:	544.5/.6
COBISS:	54442755
ISSN:	1424-8220
Views:	14
Downloads:	4
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	nerjavno jeklo;hidrometalurška industrija;žveplova kislina;uporovni senzor;korozija;
Source comment:	Opis vira z dne: 9. 3. 2021; Nasl. z nasl. zaslona; Št. članka: 1449;
Pages:	str. 1-17
Volume:	ǂVol. ǂ21
Issue:	ǂiss. ǂ4
Chronology:	2021
DOI:	10.3390/s21041449
ID:	19478721