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The sulfuric acid corrosion resistant steel for railway carriages is with the composition design of low C containing Cr. It is with good comprehensive properties as well as its microstructure is ferrite, bainite and a small quantity of pearlite through the reasonable controlled rolling and controlled cooling process, which could meet the requirements of steel for railway carriages. The scanning electron microscope observation showed that Cu, Cr, Ni and Si were obviously enriched at the interface between oxide layer and matrix of steel. As a result, the adhesive force of oxide layer and matrix is increased to prevent permeation of anions so that the resistance to corrosion of steel surface is enhanced. The corrosion rate of the test steel in the immersion test of 20% sulfuric acid is 6.46 g/(m2·h), which is 20.59% of that of Q355B, so its resistance to sulfuric acid corrosion is excellent.
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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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