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| Galvanic Corrosion Behavior of Nickel-based Alloy 925 for Downhole Tools Coupled With 110SS Steel |
| Received:September 01, 2020 Revised:September 02, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.10.006 |
| KeyWord:galvanic corrosion nickel alloy 925 sulfur resistant pipeline 110SS area ratio of anode and cathode polarization curve |
| Author | Institution |
| ZHAO Guo-xian |
School of Material Science and Engineering, Xi’an Shiyou University, Xi’an , China |
| HU Xiao-tong |
School of Material Science and Engineering, Xi’an Shiyou University, Xi’an , China |
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| Abstract: |
| To investigate the galvanic corrosion behavior and galvanic effect between nickel-based alloy 925 for downhole tools and sulfur resistant pipeline 110SS steel in different area ratios, a High temperature and high sour environment was simulated in oil and gas field in China. Electrochemical tests and immersion corrosion tests were conducted in a high temperature and high pressure autoclave, and the corrosion products formed on the metal surface were analyzed by scanning electron microscopy (SEM) and energy disperse spectroscopy (EDS), The results indicate that the free corrosion potential of 110SS steel is much lower than that of nickel alloy 925, even after coupling, galvanic corrosion occurs. The galvanic corrosion rate is positively correlated with the ratio of anode and cathode. While the coupling of heterogeneous metals has no obvious effect on the corrosion products and corrosion mechanism. |
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