Improvement of Electrochemical Surface Properties in Steel Substrates Using a Nanostructured CrN/AlN Multilayer Coating
Improvement of Electrochemical Surface Properties in Steel Substrates Using a Nanostructured CrN/AlN Multilayer Coating
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DOI：
10.1007/s11665-010-9798-7
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发表时间：
2010
影响因子：
2.3
通讯作者：
G. Cabrera;F. Torres;J. Caicedo;W. Aperador;C. Amaya;P. Prieto
中科院分区：
文献类型：
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作者：
G. Cabrera;F. Torres;J. Caicedo;W. Aperador;C. Amaya;P. Prieto
研究了磁控溅射沉积不同沉积周期（Λ）的[CrN/AlN] n多层膜对AISI D3钢表面耐蚀性能的改善作用。对于实际效果比较后的性能与CrN和AlN单层沉积与多层系统相同的条件。涂层的晶相，化学成分，微观结构和电化学性能的X-射线衍射，能量色散X-射线，傅里叶变换红外光谱，原子力显微镜，扫描电子显微镜，塔菲尔极化曲线，和电化学阻抗谱。通过光学显微镜观察腐蚀演变。X射线衍射分析结果表明，[CrN/AlN] n多层涂层的晶体结构分别为NaCl型晶格结构和六方结构（纤锌矿型），即，它被制成非同构多层。多层膜周期为Λ = 60 nm（50层）时，膜的耐蚀性最好（极化电阻为1.18 KΩ，腐蚀速率为1.02 Ω）。这些结果表明，与具有1个双层的CrN/AlN多层系统相比，耐腐蚀性能的改善分别为98%和80%。此外，AISI D3钢的耐腐蚀性提高了90%以上。多层涂层中的这些改善效果可以归因于界面的数量，所述界面充当离子物质向内和向外扩散的障碍，产生用于使腐蚀性离子平移穿过涂层/基底界面所需的能量或电势的增量。此外，由于多层膜中存在的缺陷减少，界面系统影响离子向金属基底的平均自由程。
Improvement of corrosion properties on AISI D3 steel surfaces coated with [CrN/AlN]nmultilayered system deposited for various periods (Λ) via magnetron sputtering has been studied in this work exhaustively. For practical effects compared were the latter properties with CrN and AlN single layers deposited with the same conditions as the multilayered systems. The coatings were characterized in terms of crystal phase; chemical composition, micro-structural, and electrochemical properties by x-ray diffractometry, energy dispersive x-ray, Fourier transforming infrared spectroscopy, atomic force microscopy, scanning electron microscopy, Tafel polarization curves, and electrochemical impedance spectroscopy. Corrosion evolution was observed via optical microscopy. Results from x-ray diffractometry analysis revealed that the crystal structure of [CrN/AlN]nmultilayered coatings has an NaCl-type lattice structure and hexagonal structure (wurtzite-type) for CrN and AlN, respectively, i.e., it was made non-isostructural multilayered. The best behavior was obtained by the multilayered period: Λ = 60 nm (50 bilayers), showing the maximum corrosion resistance (polarization resistance of 1.18 KΩ, and corrosion rate of 1.02 mpy). Those results indicated an improvement of anticorrosive properties, compared to the CrN/AlN multilayer system with 1 bilayer at 98 and 80%, respectively. Furthermore, the corrosion resistance of steel AISI D3 is improved beyond 90%. These improvement effects in multilayered coatings could be attributed to the number of interfaces that act as obstacles for the inward and outward diffusions of ion species, generating an increment in the energy or potential required for translating the corrosive ions across the coating/substrate interface. Moreover, the interface systems affect the means free path on the ions toward the metallic substrate, due to the decreasing of the defects presented in the multilayered coatings.