Sensor development for corrosion monitoring of stainless steels in H<sub>2</sub>SO<sub>4</sub> solutions
Year of publication
2021
Authors
Hren, Miha; Kosec, Tadeja; Lindgren, Mari; Huttunen-Saarivirta, Elina; Legat, Andraž
Abstract
<p>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% H<sub>2</sub>SO<sub>4</sub> 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.</p>
Show moreOrganizations and authors
VTT Technical Research Centre of Finland Ltd
Huttunen-Saarivirta Elina
Publication type
Publication format
Article
Parent publication type
Journal
Article type
Original article
Audience
ScientificPeer-reviewed
Peer-ReviewedMINEDU's publication type classification code
A1 Journal article (refereed), original researchPublication channel information
Open access
Open access in the publisher’s service
Yes
Open access of publication channel
Fully open publication channel
License of the publisher’s version
CC BY
Self-archived
No
Other information
Fields of science
Physical sciences; Electronic, automation and communications engineering, electronics; Chemical engineering; Materials engineering
Keywords
[object Object],[object Object],[object Object],[object Object],[object Object]
Language
English
International co-publication
Yes
Co-publication with a company
Yes
DOI
10.3390/s21041449
The publication is included in the Ministry of Education and Culture’s Publication data collection
Yes