Abstract
Arsenic may cause high-temperature corrosion in the gas line or aqueous corrosion in the acid plant of a smelter. High-temperature corrosion was studied by exposing carbon steel, 3R12, and Sanicro 28 stainless steels to an SO2-containing atmosphere at 275 °C for 142 h with and without an As2O3 deposit. The As2O3 deposit did not have any effect on stainless steels but for carbon steel, it enhanced grain boundary oxidation which is in line with the failure analysis observations that As promotes localized corrosion in carbon steel. The influence of As on aqueous corrosion was investigated with immersion tests of 316 L and LDX 2101 lean duplex for four weeks at 95 °C sulfuric acid and chloride-containing solution with and without dissolved As2O3. It was confirmed that As3+ acts as an oxidizer in the same way as metal cations that have several valence states available.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 63rd Conference of Metallurgists, COM 2024 |
| Publisher | Springer Nature |
| Pages | 373-375 |
| ISBN (Electronic) | 978-3-031-67398-6 |
| ISBN (Print) | 978-3-031-67397-9 |
| DOIs | |
| Publication status | Published - 2024 |
| MoE publication type | A3 Part of a book or another research book |