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首页> 外文期刊>Journal of Materials Engineering and Performance >Compositionally Modulated Multilayered Zn-Co Deposits for Better Corrosion Resistance
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Compositionally Modulated Multilayered Zn-Co Deposits for Better Corrosion Resistance

机译：合成的调节多层Zn-Co沉积物，可用于更好的耐腐蚀性

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Zn-Co compositionally modulated multilayer alloy (CMMA) deposits have been developed onto mild steel using single bath technique. Multilayer alloy coatings have been galvanostatically produced using square current pulses. The switched cathode current density and number of layers have been designed for improved corrosion resistance. Experimental data revealed that multilayer coating with 120 layers at 10/30 mA/cm(2) demonstrated similar to 125 times higher resistance to corrosion than monolayer alloy coating of the same thickness. The improved corrosion resistance of multilayer coatings is due to small changes in the wt.% cobalt, leading to change in the phase structure of deposit in alternate layers. The defects and failures occurring in a single layer in the deposition process are covered by the alternatively deposited coating layers. Therefore, the direction of the corrosive agent is extended or blocked. Further, the better corrosion resistances afforded by Zn-Co CMMA coatings were explained through changes in electronic properties at the interface, supported by Mott-Schottky's plot. However, the decrease of corrosion resistance at a high degree of layering is attributed to the less relaxation time for redistribution of solutes in the diffusion layer, during plating. Potentiodynamic polarization and electrochemical impedance data showed its good protection ability. The enhanced corrosion resistance of multilayered deposits is due to small change in cobalt content, leading to alter the phase structure of the alternate-layers of the deposits. The structural morphology and the topographical structure of the coating were analyzed by scanning electron microscopy and atomic force microscopy. Evaluation of the chemical composition of the alloy coatings was carried out by x-ray photoelectron spectroscopy.
机译：采用单浴技术在低碳钢上制备了Zn-Co成分调制多层合金（CMMA）镀层。利用方波电流脉冲恒电流制备了多层合金涂层。开关阴极电流密度和层数设计用于提高耐腐蚀性。实验数据显示，在10/30 mA/cm（2）下，120层的多层涂层的耐腐蚀性是相同厚度的单层合金涂层的125倍。多层涂层耐腐蚀性的提高是由于钴的重量百分比的微小变化，导致交替层中沉积物的相结构发生变化。沉积过程中发生在单层中的缺陷和故障被交替沉积的涂层覆盖。因此，腐蚀剂的方向延长或堵塞。此外，根据莫特-肖特基（Mott-Schottky）图，通过界面电子性质的变化解释了Zn-Co-CMMA涂层具有更好的耐腐蚀性。然而，在电镀过程中，由于溶质在扩散层中重新分布的弛豫时间较短，在高度分层时，耐蚀性降低。动电位极化和电化学阻抗数据显示其具有良好的保护能力。多层镀层耐蚀性的增强是由于钴含量的微小变化，导致镀层交替层的相结构发生改变。用扫描电子显微镜和原子力显微镜分析了涂层的结构形态和形貌结构。用x射线光电子能谱对合金镀层的化学成分进行了评价。

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