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首页> 外文期刊>Transactions of the Institute of Metal Finishing: The International Journal for Surface Engineering and Coatings >Production of layer by layer Zn-Fe compositional multilayer alloy coatings using triangular current pulses for better corrosion protection
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Production of layer by layer Zn-Fe compositional multilayer alloy coatings using triangular current pulses for better corrosion protection

机译：使用三角电流脉冲逐层生产Zn-Fe成分多层合金涂层，以提供更好的腐蚀防护

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摘要

Multiple-layer coatings of Zn-Fe alloy having alternatively the same compositions have been developed galvanostatically on mild steel (MS) from a single plating bath using triangular current pulses. Thiamine hydrochloride (THC) and citric acid (CA) were used as additives. Multiple-layer coatings were developed under different conditions of cyclic cathode current density (CCCD) and number of layers. Cyclic voltammetry demonstrated that the addition of THC and CA improves the deposit character by increasing the Ni content (through suppressing the deposition of Zn) via preferential adsorption on the cathode surface. The corrosion behaviours of the coatings were evaluated by electrochemical AC and DC methods. The optimum multiple-layer coating, represented as (Zn-Fe)(3.0/5.0/300), was found to exhibit about four to five times better corrosion resistance when compared with monolayer (Zn-Fe)(3.0) alloy, developed from the same bath for the same duration. Distinct phase structures responsible for interface formation between successive layers (which changes alternatively) were confirmed by X-ray diffraction analysis. Better corrosion resistance afforded by multiple-layer coating was attributed to the increased specific surface area of the coating because of layering. A synergistic effect of both structural difference between layers and individual layer thickness is responsible for enhanced corrosion resistance of the multiple-layer coatings. The formation of multiple layers and corrosion mechanism were analysed by scanning electron microscopy.
机译：交替使用相同组成的Zn-Fe合金多层涂层，是使用三角形电流脉冲从单个电镀液中在低碳钢（MS）上进行恒电流开发的。盐酸硫胺素（THC）和柠檬酸（CA）被用作添加剂。在循环阴极电流密度（CCCD）和层数的不同条件下开发了多层涂层。循环伏安法表明，THC和CA的添加通过优先吸附在阴极表面上来增加Ni含量（通过抑制Zn的沉积），从而改善了沉积性能。通过电化学交流和直流方法评估了涂层的腐蚀行为。发现由（Zn-Fe）（3.0 / 5.0 / 300）表示的最佳多层涂层与单层（Zn-Fe）（3.0）合金相比，其抗腐蚀性能提高了约四到五倍。同一浴，持续相同的时间。通过X射线衍射分析确认了负责相继层之间的界面形成的不同相结构（交替改变）。多层涂层提供的更好的耐腐蚀性归因于由于分层而增加的涂层的比表面积。层之间的结构差异和单独的层厚度两者的协同效应导致多层涂层的增强的耐腐蚀性。通过扫描电子显微镜分析了多层的形成和腐蚀机理。

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