基板表面锈蚀对热镀锌及锌铁合金化镀层的影响

doi:10.13251/j.issn.0254-6051.2024.08.045

摘要/Abstract

摘要： 利用表面局部锈蚀的无间隙原子钢(IF钢)冷轧板,在IWATANI热镀锌模拟器上进行了退火及热镀锌模拟,研究了基板表面锈蚀对退火、热镀锌(GI)与锌铁合金化(GA)镀层的影响。结果表明,在800 ℃、N₂+5%H₂的气氛中连续退火之后,锈蚀被还原成晶粒细小、结构疏松、彼此之间存在大量微孔的还原铁。在热镀锌时,还原铁与锌液发生快速扩散,使镀层内出现锌铁合金相,降低了锌液流动性,从而当试样经过气刀时,影响了镀层厚度的控制,使得锈蚀位置的GI镀层局部偏厚。镀层合金化之后,锈蚀位置的GA镀层形貌与正常镀层完全不同,镀层平且厚,最终在GA镀层表面表现为白色斑点缺陷。

关键词: 基板锈蚀, 还原铁, 热镀锌, 锌铁合金化镀层

Abstract: Annealing and hot-dip galvanizing simulations were conducted on the cold-rolled IF steel sheet with localized surfacerust by using IWATANI hot-dip galvanizing simulator. Effects of substrate surface rust on annealed, hot-dip galvanized (GI) and galvannealed (GA) coatings were studied. The results show that after continuous annealing in an atmosphere of N₂+5% H₂ at 800 ℃, the rust is reduced to reduced iron with small grains, loose structure and numerous micropores between each other. During hot-dip galvanizing, the reduced iron rapidly diffuses with the molten zinc, causing the appearance of a zinc iron alloy phase in the coating and reducing the fluidity of the molten zinc, which further affects the control of the coating thickness when the specimen passes through the air knife, resulting in localized thickening of the GI coating at the rust location. After coating alloying, the morphology of the GA coating at the rust position is completely different from that of the normal coating, that is, the coating is flat and thick, and ultimately shows as white spot defects on the surface of the GA coating.

Key words: substrate rust, reduced iron, hot-dip galvanizing, galvannealed coating

中图分类号:

TG174.443

李珊珊, 金鑫焱. 基板表面锈蚀对热镀锌及锌铁合金化镀层的影响[J]. 金属热处理, 2024, 49(8): 268-274.

Li Shanshan, Jin Xinyan. Effect of substrate surface rust on hot-dip galvanized and galvannealed coatings[J]. Heat Treatment of Metals, 2024, 49(8): 268-274.

参考文献

[1]李光瀛, 马鸣图. 我国汽车板生产现状及展望[J]. 轧钢, 2014, 31(4): 22-32.
Li Guangying, Ma Mingtu. Auto steels production in China-status and prospect[J]. Steel Rolling, 2014, 31(4): 22-32.
[2]]谢英秀, 金鑫焱, 王利. 宝钢热镀锌钢板的开发与展望[J]. 宝钢技术, 2017, 10(1): 1-6, 11.
Xie Yingxiu, Jin Xinyan, Wang Li. Development and prospects of Baosteel hot dip galvanized steel sheets[J]. Baosteel Technology, 2017, 10(1): 1-6, 11.
[3]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, 2017, 29(3): 167-174.
[4]]Jin Xinyan, Bi Wenzhen, Wang Li, et al. Root cause analysis of pinhole defects on painted galvanized steel panel[J]. Engineering Failure Analysis, 2020, 115(9): 104598.
[5]]陈光, 金鑫焱. 电镀锌汽车外板涂装气孔缺陷的原因及对策[J]. 宝钢技术, 2022(3): 7-14.
Chen Guang, Jin Xinyan. Cause analysis of gassing defects on painted electric galvanized steel sheet[J]. Baosteel Technology, 2022(3): 7-14.
[6]]张军, 金鑫焱, 钱洪卫. 热镀锌汽车板涂装气孔缺陷成因分析[J]. 鞍钢技术, 2022(5): 39-42.
Zhang Jun, Jin Xinyan, Qian Hongwei. Analysis on causes leading to porosity defects occurred in coating of hot-dip galvanized automobile steel sheets[J]. Angang Technology, 2022(5): 39-42.
[7]]李润昌, 庞二帅, 张环宇, 等. 780 MPa级热镀锌双相钢微观裂纹成因及改进措施[J]. 金属热处理, 2019, 44(8): 236-242.
Li Runchang, Pang Ershuai, Zhang Huanyu, et al. Micro-crack origin and improvement measures in 780 MPa grade hot-dip galvanized dual-phase steel[J]. Heat Treatment of Metals, 2019, 44(8): 236-242.
[8]]郭太雄, 刘春富, 金永清. 热镀锌亮点缺陷成因及其预防[J]. 轧钢, 2012, 29(4): 56-60.
Guo Taixiong, Liu Chunfu, Jin Yongqing. Origins and remedies of bright spot defect on hot dip galvanizing sheet[J]. Steel Rolling, 2012, 29(4): 56-60.
[9]赵川翔. 590 MPa级低合金高强度热镀锌钢板表面亮点缺陷分析[J]. 金属热处理, 2022, 47(6): 270-273.
Zhao Chuanxiang. Analysis of bright spot defect on surface of 590 MPa low-alloy high-strength galvannealed steel sheet[J]. Heat Treatment of Metals, 2022, 47(6): 270-273.
[10]宋志超, 韩雄超, 张才华, 等. 热镀锌增强成形性双相钢表面色差缺陷研究[J]. 轧钢, 2022, 39(4): 81-86.
Song Zhichao, Han Xiongchao, Zhang Caihua, et al. Study on surface color difference defects of hot-dip galvanized reinforced formability dual-phase steel[J]. Steel Rolling, 2022, 39(4): 81-86.
[11]]梁燕燕, 刘少先, 杨冬冬. 某热镀纯锌卷大锌花和发亮缺陷产生原因及改善措施[J]. 理化检验(物理分册), 2022, 58(3): 75-78.
Liang Yanyan, Liu Shaoxian, Yang Dongdong. Causes and improvement measures of large zinc flower and bright defects on a hot-dip pure zinc coil[J]. Physical Testing and Chemical Analysis (Part A: Physical Testing), 2022, 58(3): 75-78.
[12]]马二清, 靳立, 杨峥, 等. 热镀锌双相钢钢板表面橘皮缺陷研究[J]. 表面技术, 2023, 52(1): 214-221.
Ma Erqing, Jin Li, Yang Zheng, et al. Investigation of orange peel-like defects on galvanizied DP steel sheets[J]. Surface Technology, 2023, 52(1): 214-221.
[13]]张鹏, 刘学良, 周屿, 等. DP980-GA双相钢色差斑和黑点缺陷分析与控制[J]. 金属热处理, 2022, 46(1): 230-234.
Zhang Peng, Liu Xueliang, Zhou Yu, et al. Analysis and control of color difference and black spots defects on the surface of DP980-GA dual-phase steel[J]. Heat Treatment of Metals, 2022, 46(1): 230-234.
[14]傅影, 腾华湘, 李声慈, 等. 合金化热镀锌带钢漏镀缺陷分析[J]. 金属热处理, 2014, 39(3): 148-151.
Fu Ying, Teng Huaxiang, Li Shengci, et al. Analysis of plating miss of the galvannealed steel strip[J]. Heat Treatment of Metals, 2014, 39(3): 148-151.
[15]]姚敢英, 张磊, 代敏敏, 等. 热镀锌钢板表面色差缺陷的微观检测分析[J]. 汽车工程学报, 2015, 5(1): 23-28.
Yao Ganying, Zhang Lei, Dai Minmin, et al. Microtest analysis of chromatic aberration on hot dip galvanized steel sheets[J]. Chinese Journal of Automotive Engineering, 2015, 5(1): 23-28.
[16]]刘少先, 杨健, 徐丽菊. 合金化热镀锌无间隙原子钢板表面白色点状压印缺陷的产生原因[J]. 理化检验(物理分册), 2023, 59(1): 35-38.
Liu Shaoxian, Yang Jian, Xu Liju. Causes of white dot imprint defects on the surface of alloyed hot dip galvanized interstitial free atomic steel sheet[J]. Physical Testing and Chemical Analysis (Part A: Physical Testing), 2023, 59(1): 35-38.
[17]]赵川翔, 冯辉雄, 吴科, 等. 合金化热镀锌钢板表面锌渣缺陷研究[J], 宝钢技术, 2022(6): 26-31.
Zhao Chuanxiang, Feng Huixiong, Wu Ke, et al. Analysis of zinc dross on the surface of galvannealed steel sheet[J]. Baosteel Technology, 2022(6): 26-31.
[18]]姜贵松, 刘少先, 葛志勇, 等. 合金化热镀锌板表面条状缺陷原因分析[J]. 轧钢, 2022, 39(4): 126-131.
Jiang Guisong, Liu Shaoxian, Ge Zhiyong, et al. Causes analysis of strip defects on the surface of galvannealed sheets[J]. Steel Rolling, 2022, 39(4): 126-131.
[19]]Bi Wenzhen, Jin Xinyan, Wei Xicheng. Formation of a dark streaky edge defect on galvannealed ultra-high strength steel[J]. Surface and Coatings Technology, 2022, 433: 128162.
[20]]Chakraborty A, Mondal A, Agnihotri S, et al. Investigation of a surface defect and its elimination in automotive grade galvannealed steels[J]. Engineering Failure Analysis, 2016, 66: 455-467.
[21]刘小斐, 刘丽霞, 盖彦青. 连续退火板表面鱼鳞纹缺陷形成机理分析及改进措施[J]. 金属热处理, 2020, 45(4): 209-211.
Liu Xiaofei, Liu Lixia, Gai Yanqing. Analysis and improvement of fish scale defect formation mechanism on continuous annealed plate surface[J]. Heat Treatment of Metals, 2020, 45(4): 209-211.
[22]]Jin Xinyan, Lin Chuanhua, Qian Hongwei, et al. Bottom dross defect and its transformation behavior during the galvannealing process[J]. Baosteel Technical Research, 2020, 9: 1-11.
[23]]Lu Yong, Wang Kai, Jin Xinyan. Investigation on the transformation of sink roll groove mark defect in the galvannealing process[J]. Baosteel Technical Research, 2018, 12: 33-40.