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2 test methods, i.e. neutral salt spray method and cyclic corrosion method are utilized to study the effects of different test environments on the corrosion morphology, typical corrosion depth, corrosion products and mechanical properties of A380, YL113 and YL104 alloys. The composition of corrosion products and its corrosion mechanism are explored. The results show that, after 504 h neutral salt spray and 60 days cyclic corrosion test, the corrosion resistance of A380 alloy is the worst among the 3 die-casting aluminum alloys. Under the 2 test environments, the tensile strength of A380 alloy is reduced by 31% and 38% respectively; followed by YL113 alloy, its tensile strength decreases by 13% and 25% respectively; the tensile strength of YL104 alloy decreases by 3.6% and 1% respectively. The root cause of corrosion of these die casting alloys is that, the potential difference between phases in the matrix and the humid environment on the sample surface constitute electrochemical corrosion, which leads to corrosion.
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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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