热基板Zn-Al-Mg镀层的组织与耐蚀性影响因素分析

doi:10.13251/j.issn.0254-6051.2025.10.047

金属热处理 ›› 2025, Vol. 50 ›› Issue (10): 292-301.DOI: 10.13251/j.issn.0254-6051.2025.10.047

热基板Zn-Al-Mg镀层的组织与耐蚀性影响因素分析

李冰¹, 王世豪², 陈利伟³, 何涛^1,4, 李志超², 熊俊伟¹, 张毅¹

1.中冶南方工程技术有限公司, 湖北武汉 430223;
2.北京科技大学钢铁共性技术协同创新中心, 北京 100083;
3.武汉钢铁有限公司, 湖北武汉 430080;
4.东北大学轧制技术及连轧自动化国家重点实验室, 辽宁沈阳 110819

收稿日期:2025-04-18 修回日期:2025-08-06 出版日期:2025-10-25 发布日期:2025-11-04
通讯作者: 李志超,副教授,博士,E-mail: lizhichao1225@163.com
作者简介:李冰(1991—),男,高级工程师,博士研究生,主要研究方向为金属镀层钢新产品开发及工艺研究,E-mail: 405111648@qq.com。

Analysis of factors affecting microstructure and corrosion resistance of Zn-Al-Mg coating on hot-rolled steel

Li Bing¹, Wang Shihao², Chen Liwei³, He Tao^1,4, Li Zhichao², Xiong Junwei¹, Zhang Yi¹

1. WISDRI Engineering and Research Co., Ltd., Wuhan Hubei 430223, China;
2. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China;
3. Wuhan Iron and Steel Co., Ltd., Wuhan Hubei 430080, China;
4. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang Liaoning 110819, China

Received:2025-04-18 Revised:2025-08-06 Online:2025-10-25 Published:2025-11-04

摘要/Abstract

摘要： 以1.2~3.0 mm厚SPHC板为基板,Zn-11%Al-2.8%Mg-0.2%Si锌锭熔化为热浸镀液,采用连续热浸镀模拟试验机制备了Zn-Al-Mg镀层,研究板厚、入锅板温以及镀后冷却速度对镀层组织与耐蚀性的影响。结果表明,在冷速固定的情况下,制备镀层的最佳板厚和入锅板温分别为2.4 mm和480 ℃。在此基础上,研究冷速对镀层耐蚀性的影响。随冷速增加,镀层中富Al相与MgZn₂相细化且占比增多,共晶相变得粗大,当冷速超过10 ℃/s后,镀层中开始出现枝晶,并伴随着块状MgZn₂相的出现,且共晶相面积减小,耐蚀性逐渐降低,同时结合565 h盐雾试验判断最佳冷却速度为10 ℃/s。最佳工艺参数(板厚2.4 mm、板温480 ℃及冷速10 ℃/s)制备镀层厚度达42.516 μm,且组织中富Al相尺寸稍大且饱满,分布连贯,共晶相的分布均匀,耐蚀性较好。

关键词: 热浸镀, Zn-Al-Mg镀层, 组织, 耐蚀性

Abstract: Using SPHC steel sheets with 1.2-3.0 mm thickness as the substrate and a molten Zn-11%Al-2.8%Mg-0.2%Si alloy ingot as the hot-dip bath, Zn-Al-Mg coatings were prepared by using a continuous hot-dip simulation test setup, then the effect of sheet thickness, pot entry temperature, and post-coating cooling rate on microstructure and corrosion resistance of the coating was investigated. The results show that with a fixed cooling rate, the optimal sheet thickness and pot entry temperature for preparing the coating are 2.4 mm and 480 ℃, respectively. Based on these findings, the effect of cooling rate on corrosion resistance of the coating was studied. As the cooling rate increases, the Al-rich phase and MgZn₂ phase in the coating become finer and their proportion increase, while the eutectic phase becomes coarser. When the cooling rate exceeds 10 ℃/s, dendrites begin to appear in the coating, accompanied by the presence of block-shaped MgZn₂ phase. Concurrently, the area fraction of the eutectic phase decreases, and the corrosion resistance is gradually deteriorated. Combined with 565 h of salt spray test results, the optimal cooling rate is determined to be 10 ℃/s. Under the optimal process parameters (sheet thickness of 2.4 mm, pot entry temperature of 480 ℃ and cooling rate of 10 ℃/s), the prepared coating achieves a thickness of 42.516 μm. Furthermore, the Al-rich phase in the microstructure is slightly larger and plumpier, with continuous distribution. The eutectic phase is uniformly distributed, and the corrosion resistance is good.

Key words: hot-dip galvanizing, Zn-Al-Mg coating, microstructure, corrosion resistance

中图分类号:

TG142

李冰, 王世豪, 陈利伟, 何涛, 李志超, 熊俊伟, 张毅. 热基板Zn-Al-Mg镀层的组织与耐蚀性影响因素分析[J]. 金属热处理, 2025, 50(10): 292-301.

Li Bing, Wang Shihao, Chen Liwei, He Tao, Li Zhichao, Xiong Junwei, Zhang Yi. Analysis of factors affecting microstructure and corrosion resistance of Zn-Al-Mg coating on hot-rolled steel[J]. Heat Treatment of Metals, 2025, 50(10): 292-301.

参考文献

[1] Lee M H, Kim Y W, Lim K M I, et al. Electrochemical evaluation of zinc and magnesium alloy coatings deposited on electrogalvanized steel by PVD[J]. Transactions of Nonferrous Metals Society of China, 2013, 23(3): 876-880.
[2] 谢英秀, 金鑫焱, 王利. 热浸镀锌铝镁镀层开发及应用进展[J]. 钢铁研究学报, 2017, 29(3): 167-174.
Xie Yingxiu, Jin Xinyan, Wang Li. Development and application of hot-dip galvanized zinc-aluminum-magnesium coating[J]. Journal of Iron and Steel Research International, 2017, 29(3): 167-174.
[3] 王业科, 刘显军, 杨薇, 等. 热轧基板连续锌铝镁镀层机组的设计选型[J]. 轧钢, 2024, 41(3): 83-89, 97.
Wang Yeke, Liu Xianjun, Yang Wei, et al. Design and selection of continuous zinc-aluminum-magnesium coating line using hot rolled substrate strip[J]. Steel Rolling, 2024, 41(3): 83-89, 97.
[4] 张鹏, 张杰, 梁爱国, 等. 冷却速度对锌铝镁镀层组织及耐蚀性能的影响[J]. 河北冶金, 2022(1): 30-33.
Zhang Peng, Zhang Jie, Liang Aiguo, et al. Effect of cooling rate on microstructure and corrosion resistance of Zn-Al-Mg coating[J]. Hebei Metallurgy, 2022(1): 30-33.
[5] Morimoto Y, Honda K, Nishimura K. Excellent corrosion-resistant Zn-Al-Mg-Si alloy hot-dip galvanized steel sheet "SUPER DYMA"[J]. Nippon Steel Technical Report, 2003, 87: 22-24.
[6] 宋裕. 热浸镀锌-铝-镁合金镀层钢板的研究与应用现状[J]. 电镀与涂饰, 2019, 38(9): 442-446.
Song Yu. Current research and application status of hot-dip zinc-aluminum-magnesium alloy-coated steels[J]. Electropating and Finishing, 2019, 38(9): 442-446.
[7] 米振莉, 朱泽升, 杨晓宇, 等. 热浸镀Zn-Al-Mg镀层力学性能研究进展[J]. 轧钢, 2022, 39(4): 9-17.
Mi Zhenli, Zhu Zesheng, Yang Xiaoyu, et al. Research progress on mechanical properties of hot-dip galvanized Zn-Al-Mg coating[J]. Steel Rolling, 2022, 39(4): 9-17.
[8] 童晨, 苏旭平, 王建华, 等. Mg对Zn-6%Al镀层凝固组织的影响及耐腐蚀性的研究[J]. 热加工工艺, 2012, 41(12): 99-103.
Tong Chen, Su Xuping, Wang Jianhua, et al. Effect of Mg addition on solidification structure an corrosion resistance of Zn-6%Al alloy coating[J]. Hot Working Technology, 2012, 41(12): 99-103.
[9] Yamada W, Honda K, Tanaka K, et al. Solidification structure of coating layer in hot-dip Zn-11%Al-3%Mg-0.2%Si coated steel sheet and phase diagram of the system[J]. Nippon Steel Technical Report, 2012(102): 37-43.
[10] Jiang L, Volovitch P, Wolpers M, et al. Activation and inhibition of Zn-Al and Zn-Al-Mg coatings on steel by nitrate in phosphoric acid solution[J]. Corrosion Science, 2012, 60: 256-264.
[11] 徐闻慧, 杨洪刚, 金勇, 等. 冷却速率对Al-Zn-Mg-Si镀层组织及耐蚀性的影响[J]. 轧钢, 2024, 41(4): 73-78.
Xu Wenhui, Yang Honggang, Jin Yong, et al. Effect of cooling rate on microstructure and corrosion resistance of Al-Zn-Mg-Si coating[J]. Steel Rolling, 2024, 41(4): 73-78.
[12] 李凯良, 吴长军, 彭浩平, 等. Mg对Zn-11%Al合金镀层凝固组织及合金层生长的影响[J]. 工程科学学报, 2016, 38(8): 1123-1131.
Li Kailiang, Wu Changjun, Peng Haoping, et al. Effect of Mg on the solidification structure and growth of the intermetallic layer of a Zn-11%Al alloy coating[J]. Chinese Journal of Engineering, 2016, 38(8): 1123-1131.
[13] Li J P, Cheng S S, Yan X T, et al. Microstructure evolution and corrosion resistance of directionally solidified Zn-11Al-3Mg-0.2Si alloy with discontinuous changes in growth rates[J]. Materials Today: Communications, 2025, 45: 112396.
[14] 崔桂彬, 鞠新华, 严春莲, 等. 热浸镀低合金高强钢Zn-Al-Mg镀层的组织结构表征[J]. 钢铁, 2023, 58(1): 153-160.
Cui Guibin, Ju Xinhua, Yan Chunlian, et al. Microstructure characterization of hot-dip Zn-Al-Mg coating of low alloy high strength steel[J]. Iron and Steel, 2023, 58(1): 153-160.
[15] Zhang Z, Zhang J, Zhao X, et al. Effects of Al-Mg on the microstructure and phase distribution of Zn-Al-Mg coatings[J]. Metals, 2023, 13(1): 46.
[16] 蔡宁, 黎敏, 赵晓非, 等. Zn-Al-Mg镀层的微观组织及相组成分析[J]. 中国冶金, 2020, 30(8): 35-41.
Cai Ning, Li Min, Zhao Xiaofei, et al. Microstructure and phase analysis on Zn-Al-Mg alloy coating[J]. China Metallurgy, 2020, 30(8): 35-41.
[17] Nicard C, Allély C, Volovitch P. Effect of Zn and Mg alloying on microstructure and anticorrosion mechanisms of Al-Si based coatings for high strength steel[J]. Corrosion Science, 2018, 146: 192-201.
[18] Persson D, Thierry D, Lebozec N, et al. In situ infrared reflection spectroscopy studies of the initial atmospheric corrosion of Zn-Al-Mg coated steel[J]. Corrosion Science, 2013, 72: 54-63.
[19] 邹建国, 卢琳. 锌铝镁镀层中合金相与耐蚀性关系的研究进展[J]. 中国有色金属学报, 2022, 32(7): 1934-1944.
Zou Jianguo, Lu Lin. Research progress on relationship between alloy phase and corrosion resistance in Zn-Al-Mg coating[J]. The Chinese Journal of Nonferrous Metals, 2022, 32(7): 1934-1944.
[20] Suzuki Y, Yamaguchi S, Matsumoto M, et al. Mechanism of corrosion protection at cut edge of Zn-11%Al-3%Mg-0.2%Si coated steel sheets[J]. Tetsu-to-Hagane, 2019, 105(7): 752-758.

热基板Zn-Al-Mg镀层的组织与耐蚀性影响因素分析

Analysis of factors affecting microstructure and corrosion resistance of Zn-Al-Mg coating on hot-rolled steel

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