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In this paper, the effects of different chloride ion (Cl-) concentrations on corrosion behavior of T91 steel treated by indentation method in the neutral salt spray environment are studied. The corrosion test of 48~288 h for indentation specimens is carried out with NaCl solutions of concentrations of 10% and 15% under the standard neutral salt spray test conditions. It is found that the corrosion weight loss in the environment of 15% NaCl is higher than that in the environment of 10% NaCl through analyzing the corrosion weight loss, corrosion morphology and corrosion products as well as the difference between them is increased with the extension of corrosion time, which reaches the maximum value (0.008 5 g) at 288 h. This proves that the corrosion effects of environment with high Cl- concentration on T91 steel are stronger and they are obvious with time accumulation. The observation results of scanning electron microscope showed that the indentation was more easy-corrosive and the more the Cl- concentration, the more serious the corrosion was, which indicates that the corrosion resistance in this area is significantly reduced by stress concentrations (dislocations, microcracks etc.) introduced by indentation so that it becomes the sensitive area where corrosion occurs preferentially.
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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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