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The application of post-treatment technology in the surface treatment of steel-aluminum mixture was studied by Scanning Electron Microscope (SEM), inductively coupled plasma emission spectrometer and cyclic alternating salt spray tester. The results show that the cold-rolled sheet and galvanized sheet on the car body form uniform and dense phosphating film after the new pretreatment process. After the new pretreatment process, a passive film was formed on the surface of aluminum plate. With the increase of aluminum in steel-aluminum mixture, the amount of slag in phosphating solution decreases gradually. When the treated material is only iron, the slag in phosphating solution is 2.5 g/m2, and when all the treated materials are aluminum, the slag in phosphating solution is lower than 0.5 g/m2. When the new pretreatment process is used to treat the steel-aluminum mixture, the concentration of all ions in the phosphating solution can be kept at a stable level. The adhesion test results of paint films of three aluminum plates meet the standard requirements. After 1 000 h salt spray test, the unilateral corrosion of cold-rolled plate is less than 2 mm, and there is no foaming and peeling of paint film. After 1 008 h cyclic alternating test of aluminum plate and galvanized plate, the width of unilateral corrosion expansion is less than 2 mm, and the paint film does not bubble or peel off.
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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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