Sensor development for corrosion monitoring of stainless steels in h2so4 solutions

Miha Hren; Tadeja Kosec; Mari Lindgren; Elina Huttunen-Saarivirta; Andraž Legat

doi:10.3390/s21041449

Sensor development for corrosion monitoring of stainless steels in h₂so₄ solutions

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

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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.

Original language	English
Article number	1449
Pages (from-to)	1-17
Number of pages	17
Journal	Sensors
Volume	21
Issue number	4
DOIs	https://doi.org/10.3390/s21041449
Publication status	Published - 19 Feb 2021
MoE publication type	A1 Journal article-refereed

Keywords

Corrosion
Electrical resistance sensor
Hydrometallurgical industry
Stainless steel
Sulfuric acid

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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.",

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