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首页> 外文期刊>Journal of Materials Engineering and Performance >Improvement of the Electrochemical Behavior of Steel Surfaces Using a [Ti-Al/Ti-Al-N]_n Multilayer System
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Improvement of the Electrochemical Behavior of Steel Surfaces Using a [Ti-Al/Ti-Al-N]_n Multilayer System

机译：[Ti-Al / Ti-Al-N] _n多层体系改善钢表面的电化学行为

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The aim of this work is to improve the corrosion resistance of AISI D3 steel surfaces using a [Ti-Al/Ti-Al-N]_n multilayer system deposited with different periods (Λ) and bilayer numbers (n), via magnetron co-sputtering pulsed d.c. procedure, from a metallic (Ti-Al) binary target. The multilayer coatings were characterized by cross-sectional scanning electron microscopy that showed the modulation and micro-structure of the [Ti-Al/Ti-Al-N]_n multilayer system. The composition of the single Ti-Al and Ti-Al-N layer films was studied via x-ray photoelectron spectroscopy, where typical signals for Ti_(2p1/2), Ti_(2p), N_(1s), and Al_(2p3/2) were detected. The electrochemical properties were evaluated by electrochemical impedance spectroscopy and Tafel polarization curves. The optimal electrochemical behavior was obtained for the [Ti-Al/Ti-Al-N]_n multilayered period of Λ = 25 nm (100 bilayers). At these conditions, the maximum polarization resistance (1719.32 kΩ cm~2) and corrosion rate (0.7 μmy) were 300 and 35 times higher than that of uncoated AISI D3 steel substrate (5.61 kΩ cm~2 and 25 μmy, respectively). Finally, scanning electron microscopy was used to analyze the [Ti-Al/Ti-Al-N]_n multilayered surface after the corrosive attack. The improvement effects in the electrochemical behavior of the AISI D3 coated with the [Ti-Al/Ti-Al-N]_n multilayered coatings could be attributed to the number of interfaces that act as obstacles for the inward and outward diffusions of Cl~- ions, generating an increment in the energy or potential required for translating the corrosive ions across the coating/substrate interface.
机译：这项工作的目的是使用[Ti-Al / Ti-Al-N] _n多层系统，通过磁控管共沉积，以不同的周期（Λ）和双层数（n）沉积，以提高AISI D3钢表面的耐腐蚀性。溅射脉冲直流从金属（Ti-Al）二元靶材进行操作。通过横截面扫描电子显微镜表征了多层涂层，其显示了[Ti-Al / Ti-Al-N] _n多层体系的调制和微观结构。通过X射线光电子能谱研究了Ti-Al和Ti-Al-N单层膜的组成，其中Ti_（2p1 / 2），Ti_（2p），N_（1s）和Al_（2p3）的典型信号/ 2）被检测到。通过电化学阻抗谱和Tafel极化曲线评价电化学性质。对于Λ= 25 nm（100双层）的[Ti-Al / Ti-Al-N] _n多层周期，获得了最佳的电化学行为。在这些条件下，最大极化电阻（1719.32kΩcm〜2）和腐蚀速率（0.7μmy）分别是未涂覆AISI D3钢基底（分别为5.61kΩcm〜2和25μmy）的300和35倍。最后，用扫描电子显微镜分析了腐蚀后的[Ti-Al / Ti-Al-N] _n多层表面。涂有[Ti-Al / Ti-Al-N] _n多层涂层的AISI D3的电化学行为的改善效果可归因于充当阻碍Cl〜-向内和向外扩散的界面数量。离子，使腐蚀离子跨过涂层/基体界面平移所需的能量或电势增加。

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