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Outline
A flexural loading test was used to study the influence of loading stress and H2S coupling environment on the corrosion resistance of oil well pipes. SEM、LCSM and EPMA were used to analyze the influence of different loads on the corrosion morphology, corrosion resistance and corrosion depth of 110S oil well pipes, and to explore the migration mechanism of corrosive S ions in the rust layer. The results showed that the tensile stress produced by bending loading could significantly accelerate the corrosion, and the effect of loading stress was much greater than that of hydrogen sulfide. The maximum corrosion depth of the specimen surface was positively correlated with the magnitude of the tensile stress. With the increase of load, the circular corrosion pits on the specimen surface transformed into boat-shaped corrosion pits, and the length, width and depth of the corrosion pits increased with the applied load, as did the depth-to-width ratio. Under the coupling effect of loading stress and H2S, the corrosion rate of oil well pipes significantly increased, and the depth of corrosion pits increased from 6.278 6 μm to approximately 131 μm. The superimposed blocked cell effect caused S ions to migrate continuously from the rust layer to the rust layer/substrate interface, which further increased the stress corrosion cracking tendency.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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