The Film Forming Mechanism of Chromium-free Passivation in the Tannic Acid System for Electrogalvanized Coating

1st International Workshop on Materials Science and Mechanical Engineering

材料科学;机械制造

Meng, K.^1,2 ; Rong, J.^2 ; Yu, X.H.^2 ; Wang, Y.^1

College of Mechanical and Manufacturing Engineering, Southwest Forestry University, No. 300 Bailong temple, Panlong District Kunming, Yunnan, China^1

Faculty of Materials Science and Engineering, Kunming University of Science and Technology, No. 253, Xuefu Road, Wuhua District Kunming, Yunnan, China^2

关键词: Atomic emission spectrometry;    Electrogalvanized;    Element distribution;    Film formations;    Film forming mechanism;    Infrared spectrometry;    Passivation coating;    Silane coupling agent;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/281/1/012036/pdf
DOI  :  10.1088/1757-899X/281/1/012036

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this paper, tannic acid, fluorine titanate and silane coupling agent passivation solution were used to prepare hot dip 55% Al-Zn steel sheet passivation coating. And then the mechanism of film formation was studied. The microstructure, surface composition, layer by layer element distribution and molecular structure of 55% Al-Zn steel sheet passivation coating were revealed in scanning electron microscopy, X ray photoelectron spectroscopy, glow discharge atomic emission spectrometry and infrared spectrometry, respectively. The results show that: in one hand, using the silane coupling agent would generate many sol-gel particles in the passivation solution. On the other hand, tannic acid would produce spatial mesh structure. Therefore, passivation solution would generate a smooth, uniform and compact 55% Al-Zn steel sheet passivation coating or membrane.