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Peak regulation in thermal power plants is an inevitable trend under the development of new energy. Under this condition, the initial condensing zone of steam turbine moves forward and the corrosion of low pressure cylinder intensifies. Several methods such as electrochemical testing, sample weight loss and metal surface topography analysis (SEM, EDS, XRD, and so on) were used to study the pitting corrosion characteristics of 2Cr13 steel (the material of low pressure cylinder of the steam turbine) under the conditions of simulated initial setting zone, with different mass concentrations and different mass concentration ratios of Cl– to SO42– of three anions (Cl–, SO42– and CH3COO–). The test results showed that, the corrosion rate of 2Cr13 steel increased with the anions’ mass concentration, and the maximum corrosion rate (0.095 23 g/(m2·h)) occurred when was 2:1. Pitting corrosion was observed in all samples, and the number of pitting corrosion increased with the anions’ mass concentration. With the change of, Cl– and SO42– on the metal surface of 2Cr13 steel changed from site competitive adsorption effect to mutual synergistic effect, resulting in the intensification of uniform corrosion and pitting corrosion. The chloride ions and sulfate in the initial coagulation zone of steam turbine will accelerate the corrosion rate of 2Cr13 steel and the occurrence of point corrosion. In actual operation of power plant, measures should be taken to prevent the leakage of condenser tubes and the broken particles of positive resin should be effectively removed.
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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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