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

机译:电镀锌涂层鞣酸体系中无铬钝化的成膜机理

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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.
机译:在本文中,使用单宁酸,氟钛酸盐和硅烷偶联剂钝化溶液制备热浸渍55%Al-Zn钢板钝化涂层。然后研究了膜形成机制。在扫描电子显微镜,X射线光电子体光谱,发光放电原子发射光谱和红外光谱中,在扫描电子显微镜下显示了微观结构,表面组成,层元素分布和55%Al-Zn钢板钝化涂层的分子结构。结果表明:一方面,使用硅烷偶联剂将在钝化溶液中产生许多溶胶凝胶颗粒。另一方面,单宁酸会产生空间网结构。因此,钝化溶液将产生光滑,均匀和紧凑的55%Al-Zn钢板钝化涂层或膜。

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