4.6 Article

Sensor Development for Corrosion Monitoring of Stainless Steels in H2SO4 Solutions

期刊

SENSORS
卷 21, 期 4, 页码 -

出版社

MDPI
DOI: 10.3390/s21041449

关键词

stainless steel; hydrometallurgical industry; sulfuric acid; electrical resistance sensor; corrosion

资金

  1. EIT Raw Materials, upscaling project Cortools-Co-creation of corrosion monitoring and prediction tools
  2. Slovenian National Building and Civil Engineering Institute (ZAG)

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An electrical resistance sensor was developed to monitor corrosion in acidic solutions at high temperature using grade 2507 duplex stainless steel as the electrode material, showing significantly lower corrosion rates and promising results for durability and performance under industrial-process conditions.
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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