| RAO Si-xian,ZUO Jing-cheng,HUANG Guo-hui,SHI Ya-fei,WANG Xiao-yi.Interactions between Zinc Corrosion and Abrasion of Sleeves and Bushings in Continuous Hot-Dip Galvanizing Line[J],52(6):266-275 |
| Interactions between Zinc Corrosion and Abrasion of Sleeves and Bushings in Continuous Hot-Dip Galvanizing Line |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.06.023 |
| KeyWord:hot-dip galvanizing line sink roll system sleeves and bushings zinc corrosion mixed wear failure |
| Author | Institution |
| RAO Si-xian |
China International Science and Technology Cooperation Base on Intelligent Equipment Manufacturing in Special Service Environment, Department of Mechanical Engineering, Anhui Polytechnic University, Anhui Maanshan , China;Hefei General Machinery Research Institute, Hefei , China |
| ZUO Jing-cheng |
China International Science and Technology Cooperation Base on Intelligent Equipment Manufacturing in Special Service Environment, Department of Mechanical Engineering, Anhui Polytechnic University, Anhui Maanshan , China |
| HUANG Guo-hui |
China International Science and Technology Cooperation Base on Intelligent Equipment Manufacturing in Special Service Environment, Department of Mechanical Engineering, Anhui Polytechnic University, Anhui Maanshan , China |
| SHI Ya-fei |
China International Science and Technology Cooperation Base on Intelligent Equipment Manufacturing in Special Service Environment, Department of Mechanical Engineering, Anhui Polytechnic University, Anhui Maanshan , China |
| WANG Xiao-yi |
China International Science and Technology Cooperation Base on Intelligent Equipment Manufacturing in Special Service Environment, Department of Mechanical Engineering, Anhui Polytechnic University, Anhui Maanshan , China |
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| Abstract: |
| It is of great significance to clarify the interaction mechanism of zinc corrosion and wear between sleeves and bushings for rational selection of materials and effective control of wear. The ceramic fiber muffle furnace was used to heat the pure zinc particles to 460 ℃, then the liquid zinc etching test was conducted on the sleeve and bushing samples. Ansys was applied to simulate the contact stress between the sleeves and the bushings of three rolls. A MFT3000 multifunctional wear tester was used to measure the friction coefficient and wear amount of the samples. A Hirox-7700 three dimensional video microscope was adopted to observe the three-dimensional morphology of the samples. A JSM-6510LV scanning electron microscope was used to analyze the microstructure and observe the surface morphology. When the 316L stainless steel samples were immersed in high temperature zinc solution for 1 h, there were several alloy layers on the external surface of the substrate, with a total thickness of 600-800 μm. When the tension of the strip steel was 20 kN and the insertion amount of the correction roll was 10 mm, the contact stress between the sleeves and the bushings of the sink roll, the stabilizing roll and the correction roll could reach 65.14 MPa, 17.79 MPa and 26.69 MPa respectively. For the friction coefficient between the sleeves and the bushings under the three working conditions, the following contents could be known. When the vertical applied load was 81 N, the friction coefficient was high at the initial wear stage without the zinc penetration treatment, but it was stable to 0.03 after 900 s. When the vertical applied load rose to 154.5 N without zinc penetration treatment, the friction coefficient remained extremely low. After the zinc penetration treatment, it could be found that the friction coefficient fluctuated around 0.1 whether the vertical applied load was 81 N or 154.5 N. When the hard zincilate particles were added to the zinc penetration treatment, the friction coefficient would be further increased, and the fluctuation range of the friction coefficient would be greater. Whether 81 N or 154.5 N was applied vertically, the wear amount increased in turn under three working conditions:no zinc penetration treatment, zinc penetration treatment, zinc penetration treatment and hard zincilate particles addition. After high temperature galvanizing corrosion, 316L stainless steel could form multiple alloy layers structures on its surface. From the outside to the inside of the corrosion layer formed, they were the η phase , the ζ phase, the δ1 phase, and the γ phase. The Cr rich layer on the surface of the stainless steel substrate could limit the expansion of the sherardizing layer, but the sherardizing layer formed could significantly improve the friction coefficient and wear amount between the sleeves and the bushings, which made the low hardness alloy layer on the surface wear rapidly. When the hard zincilate particles were further involved in the wear, they would be pressed into the surface of the sleeve and damage the surface, so that the friction coefficient would fluctuate significantly and the wear amount would further increase. The wear between the sleeves and the bushings in the hot-dip galvanizing line belongs to the mixed wear of adhesive wear, corrosion wear and abrasive wear. The abrasion removes the alloy layer, which makes the fresh substrate continuously be exposed and continue to generate new alloy layer. The mutual cooperation between the two makes the wear rate of stainless steel increase and the sleeves lose efficacy rapidly. |
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