| WANG Yin-jun,ZHANG Jie,XU Yong,JIANG She-ming,ZHANG Qi-fu.Effects of Ti on Formation of Suspending Dross in Continuous Hot Dip Galvanizing Al-Zn Molten Bath[J],49(1):304-310 |
| Effects of Ti on Formation of Suspending Dross in Continuous Hot Dip Galvanizing Al-Zn Molten Bath |
| Received:August 12, 2019 Revised:January 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.01.036 |
| KeyWord:continuous hot dip galvanizing hot dip aluminizing Al-Zn molten bath Ti suspending dross top dross around pot edge bottom dross |
| Author | Institution |
| WANG Yin-jun |
1.National Engineering Laboratory of Advanced Coating Technology for Metal Materials, Central Iron & Steel Research Institute, Beijing , China; 2.Shanghai Meishan Iron & Steel Co., Ltd, Nanjing , China |
| ZHANG Jie |
1.National Engineering Laboratory of Advanced Coating Technology for Metal Materials, Central Iron & Steel Research Institute, Beijing , China |
| XU Yong |
2.Shanghai Meishan Iron & Steel Co., Ltd, Nanjing , China |
| JIANG She-ming |
1.National Engineering Laboratory of Advanced Coating Technology for Metal Materials, Central Iron & Steel Research Institute, Beijing , China |
| ZHANG Qi-fu |
1.National Engineering Laboratory of Advanced Coating Technology for Metal Materials, Central Iron & Steel Research Institute, Beijing , China |
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| Abstract: |
| The work aims to investigate the effects of titanium on the formation of suspending dross in continuous hot dip galvanizing aluminum zinc molten bath, and then explore the types, sizes, amounts and growth mechanism of the zinc slags in the molten bath added with Ti. Titanium aluminum zinc alloys were added to the Al-Zn bath to take zinc slag samples from premelting zinc pot and the main zinc pot about 350 mm below the molten bath surface. After addition of Ti, top dross around pot edge and bottom dross were extracted during the replacement of sinking roll. Spark optical emission spectrometer (S-OES) was used to analyze Ti content in the molten bath during different periods before and after addition of Ti. The morphologies, sizes, compositions and amounts of zinc slags were analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). Some Al-V-Ti system zinc slags in ellipsoidal shape with sizes between about 10~43 μm occurred in the premelting pot after Ti-Al-Zn alloy was added continuously for about 2 hours. The sizes of 80% zinc slags were about 10~25 μm and some holes in different sizes appeared in center of the larger slags. After addition of Ti, suspending dross in main zinc pot Al-Zn bath contained Al-V-Ti system zinc slags of ellipsoidal shape and Al-Fe-Si system zinc slags of polygonal and block shape. The sizes of most Al-Fe-Si system zinc slags were about 10~50 μm and much larger than that of Al-V-Ti system zinc slags. After addition of Ti, the top dross around pot edge and the bottom dross were mainly composed of Al-V-Ti system zinc slags in ellipsoidal shape Al-Fe-Si system zinc slags in polygonal shape, and molten solidifying structure. Al-V-Ti system zinc slags with size of 10~46 μm were most, accounting for 93% in top dross and 97% in bottom dross. The sizes of 50% of Al-Fe-Si system zinc slags were about 150 μm in top dross and 200 μm in bottom dross. Ti content in main zinc pot changes more slowly than that in the premelting pot, which basically increases linearly with time. Following the subsequent increase of Ti content in main zinc pot, the Al-V-Ti system zinc slags tend to aggregate in scale and amount. The Al-V-Ti system zinc slags have small sizes and increase slowly. The amount of Al-Fe-Si system zinc slags with size of 30~80 μm tend to increase. Under production condition, some suspending dross changes to top dross and bottom dross. Some holes in zinc dross provide space for cross-link growth of zinc slags, which is beneficial to forming larger zinc slags. |
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