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The 09CrCuSb acid resistant steel (also known as ND steel) is the low alloy structural steel with resistance to sulfuric acid dew point corrosion as well as is applied in such industrial fields as the metallurgy, chemical engineering and petroleum. In this paper, the mass loss and mass loss rate of 09CrCuSbRE and Q235B are compared with the complete immersion of 24 h, 48 h and 72 h at constant temperature of 70 ℃ as well as take the sulfuric acid with concentration of 50% as corrosive medium. The results showed that the change of corrosion resistance rate curve was not obvious and resistance to sulfuric acid corrosion of 09CrCuSbRE was excellent with the extension of corrosion time. With the extension of corrosion time, the corrosion resistance rate curve of Q235B was risen sharply after 48 h, which indicated poor resistance to sulfuric acid corrosion. There are such elements as Cr and Cu on corrosion surface and in corrosion pit of 09CrCuSbRE through observing the corrosion surface with scanning electron microscope(SEM) and energy spectrum analysis. The elements of Cr and Cu in steel are with the effect of passivating steel surface in corrosion resistant environment to prevent the electrochemical reaction between the corrosive medium and matrix of steel. Moreover, the corrosion rate of 09CrCuSbRE is further reduced by adding such elements as Sb and rare earth(RE) in the steel.
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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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