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| Corrosion Resistance Evaluation of IN625 Alloys under Acidic Sulfur-containing Conditions |
| Received:November 01, 2024 Revised:November 25, 2024 |
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| DOI：10.7643/issn.1672-9242.2025.02.015 |
| KeyWord:IN625 alloys elemental sulfur corrosion product film acidic environment corrosion evaluation multi-factor coupling |
| Author | Institution |
| LI Ke |
Southwest Branch of China Petroleum Engineering & Construction Corporation, Chengdu , China |
| LI Tianlei |
Southwest Branch of China Petroleum Engineering & Construction Corporation, Chengdu , China |
| LI Xing |
Turkmenistan Branch of China Petroleum Engineering & Construction Corporation, Beijing , China |
| SHI Daiyan |
Southwest Branch of China Petroleum Engineering & Construction Corporation, Chengdu , China |
| YANG Zhi |
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an , China |
| ZHONG Xiankang |
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an , China |
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| Abstract: |
| The work aims to evaluate the corrosion adaptability of IN625 alloy under the coupling effects of H2S, CO2, elemental sulfur, and temperature. A high-temperature and high-pressure reactor was used to simulate the corrosion process of IN625 alloy under acidic sulfur-containing conditions, and the effect of different forms of elemental sulfur, temperature conditions, and the partial pressures of H2S and CO2 on the corrosion behavior of IN625 alloy was deeply explored through weight loss method and surface analysis techniques. The corrosion product film deposited on IN625 surface was uniform and dense, with excellent corrosion resistance. However, in the presence of acidic gases, pitting corrosion occurred on the alloy surface, and its corrosion rate in the liquid or gas phase was 2 to 3 times higher than that in the absence of acidic gases, reaching a maximum of 0.064 6 mm/a. Full coverage of elemental sulfur caused uniform corrosion, while suspended elemental sulfur lead to localized corrosion, with the corrosion rate increasing with temperature. In acidic gas fields containing elemental sulfur, although IN625 alloy generally has good corrosion resistance, it still faces corrosion risks under complex conditions with multiple factors coupled. Therefore, to ensure the safe operation of gas field equipment, it is necessary to reasonably select materials and take appropriate protective measures based on specific service conditions. |
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