Majeed Mohammad N, Yousif Qahtan A, Bedair Mahmoud A
College of Education, Department of Chemistry, University of Al-Qadisiyah, Al Diwaniyah 58001, Iraq.
College of Engineering, Department of Materials Engineering, University of Al-Qadisiyah, Al Diwaniyah 58001, Iraq.
ACS Omega. 2022 Aug 17;7(34):29850-29857. doi: 10.1021/acsomega.2c02679. eCollection 2022 Aug 30.
This study uses nickel nanoparticles coated on the nickel-chromium (Ni-Cr) alloy by the electrodeposition technique to protect the alloy against corrosion. An open-circuit potential and potentiodynamic and linear polarization resistance in a 1 M HSO solution saturated with carbon dioxide were used to study the anticorrosion performance of nanoparticle coatings. When coated with nanomaterials, the corrosion rate of Ni-Cr alloy was lower than when it was bare, and the potential for corrosion increased from -0.433 V for uncoated Ni-Cr alloy to -0.103 V when the electrodes were exposed to saturated calomel. Electrochemical experiments show that nickel-coated Ni-Cr alloy corrosion in sulfuric acid media has high protective characteristics, with an efficiency of 83.69% at 0.165 mA/cm current density when pH = 1 is used. As demonstrated by the results of this research, the nickel-chromium alloy can be protected from corrosion in acidic media by a low-acidity bath coating layer. Surface morphologies have shown that coatings at different acidic scales may be able to resist an acid attack because of their excellent adherence to the nickel-chromium alloy surface. Measures for determining and studying the composition of the alloy surface's protective covering were improved using X-ray diffraction (XRD).
本研究采用电沉积技术在镍铬（Ni-Cr）合金上包覆镍纳米颗粒，以保护该合金免受腐蚀。利用在二氧化碳饱和的1 M HSO溶液中的开路电位、动电位极化和线性极化电阻来研究纳米颗粒涂层的防腐性能。当涂覆纳米材料时，Ni-Cr合金的腐蚀速率低于未涂覆时，并且当电极暴露于饱和甘汞电极时，腐蚀电位从未涂覆的Ni-Cr合金的-0.433 V增加到-0.103 V。电化学实验表明，镀镍的Ni-Cr合金在硫酸介质中的腐蚀具有高保护特性，当pH = 1时，在0.165 mA/cm电流密度下的保护效率为83.69%。本研究结果表明，低酸度镀浴涂层可保护镍铬合金在酸性介质中免受腐蚀。表面形态表明，不同酸度尺度下的涂层由于其对镍铬合金表面的优异附着力，可能能够抵抗酸侵蚀。利用X射线衍射（XRD）改进了测定和研究合金表面保护覆盖层成分的方法。
