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 | |
| Publication status | Published - 19 Feb 2021 |
| MoE publication type | A1 Journal article-refereed |
Funding
This research was funded by EIT Raw Materials, upscaling project Cortools—Co-creation of corrosion monitoring and prediction tools. The APC was funded by the Slovenian National Building and Civil Engineering Institute (ZAG).
Keywords
- Corrosion
- Electrical resistance sensor
- Hydrometallurgical industry
- Stainless steel
- Sulfuric acid