Full
Outline
Taking the rare earth magnesium alloy as the research object, an organic-inorganic composite passivation film is prepared by using silane-modified trivalent chromium passivation solution. To investigate the effects of process parameters such as silane concentration and passivation time on the quality and performance of the film, micro-morphology, film thickness, adhesion strength, and neutral salt spray tests are conducted. To investigate the influences of process parameters such as silane concentration and passivation time on the quality and performance of the film, microscopic morphology, film thickness, adhesion force and neutral salt spray test are conducted. The results show that the synergistic mechanism between silane and trivalent chromium could effectively fill the defects of the film, improve the compactness, and thereby enhance the corrosion resistance. The silane concentration is a key factor influencing the density of the film. When the silane concentration is too low, the three-dimensional network structure formed through cross-linking could not fully fill the pores of the passivation film, resulting in limited protective effect; while a reasonable silane concentration is conducive to the formation of a dense and uniform passivation film, effectively blocking the corrosive medium. Compared with not adding silane, the annual corrosion rate of the sample decreases by 65.97% (0.211 mm/a), but the duration of the passivation treatment needs to be controlled to avoid the slight dissolution of the passivation film in the trivalent chromium passivation solution, which would subsequently reduce the protective performance.
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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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