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The Galvannealed(GA)-coated sheets are subjected to cold rolling deformation, and the changes in the morphology, element distribution and corrosion resistance of the GA coating at different reduction rates are explored. The results show that the original coating before rolling is mainly composed of δ(FeZn7) and Γ(FeZn10) phases, and a free Zn layer with loose distributed holes is found on the surface of the coating. The holes are deformed into needle shape along the rolling direction, and the density gradually decreases. When the reduction rate is greater than 40%, the needle-like micro-holes disappears. With the increase of cold rolling reduction rate, the thickness of the coating layer decreases continuously, and the hardness of the coating layer and the substrate increases. When the reduction ratio is larger, the interface presents a zigzag shape. The change of reduction rate has little effect on the distribution of Zn and Fe elements, and there is an iron-rich diffusion layer at the interface between the coating and the substrate. When the reduction rate is greater than 20%, the coating is broken to a certain extent, and a small amount of O element begins to exist at the interface of the coating and the substrate. The weight loss of GA coated sheet under corrosion tends to be gentle with the increase of time, and the difference of loss weight between different reduction rates is small, and the coating after rolling still protects the substrate well.
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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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