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Phosphating and silane treatments are the common surface pretreatment technologies for cold rolled sheet. In this paper, the two conversion coating technologies are compared and analyzed from such aspects as the process flow, mechanism of film formation and evaluation methods as well as the morphologies of the two conversion coatings are compared and analyzed by scanning electron microscopy. Moreover, the influences of pretreatment technology on the surface roughness and peak density of cold rolled automobile steel DC04 are studied. The results showed that the surface conditioning and double washes after phosphating were omitted for silane treatment process compared with phosphating process as well as process flow was short and environmental; the mode of phosphate precipitation was adopted for film formation of phosphating, while covalent bond was adopted for film formation of silane treatment. Since the phosphating phase is crystal structure, so its phase composition and proportion could be evaluated by X-ray diffractometer. The phosphating film is composed of phosphate of 2~4 μm, while silane film is composed of finer round or irregular particles analyzed by scanning electron microscopy. After phosphating or silane treatment, the surface roughness of sample of cold rolled sheet DC04 remains unchanged, but peak density is increased slightly.
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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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