Ni-P-carbon nanotube (CNT) coatings were electrodeposited over mild steel using electrolyte bath containing different CNT concentrations (2.5, 5, 10, 15 mgl⁻¹). Ni-P-CNT coatings exhibited improved corrosion resistance when compared to the pristine Ni-P coating. The corrosion behavior of the samples at different exposure times (1, 24, 48, 72 h) was analyzed using potentiodynamic polarization and electrochemical impedance spectroscopy techniques. After 1h immersion in the corrosive media, highest charge transfer resistance with lowest corrosion current density value was observed for the coating obtained from electrolyte with 5 mgl⁻¹ CNT concentration when compared to other coatings. This coating showed the highest corrosion resistance primarily due to lesser morphological defects. The non-uniform distribution of agglomerated CNTs in Ni-P-CNT coatings from electrolytes with lower (0 and 2.5 mgl⁻¹) and higher CNT concentration (10, 15 mg l⁻¹) caused surface defects and degraded corrosion resistance. For higher exposure times, the coating produced from the electrolyte containing 10 mgl⁻¹ CNT concentration exhibited the highest corrosion resistance property. It was shown that an optimization of CNT dispersion in the electroplating bath is required to achieve highest anti-corrosive property and this optimum requirement varies with the change in the exposure time of the coating to the corrosive media.

Ni-P-碳纳米管（CNT）涂层使用含有不同CNT浓度（2.5、5、10、15mgl ^-1）的电解液在低碳钢上电沉积。与原始 Ni-P 涂层相比，Ni-P-CNT 涂层表现出更高的耐腐蚀性。使用动电位极化和电化学阻抗谱技术分析了样品在不同暴露时间（1、24、48、72 小时）下的腐蚀行为。在腐蚀性介质中浸泡 1 小时后，对于由 5 mgl ^-1电解质获得的涂层，观察到最高的电荷转移电阻和最低的腐蚀电流密度值与其他涂层相比时的 CNT 浓度。这种涂层显示出最高的耐腐蚀性，主要是由于较少的形态缺陷。来自具有较低（0 和 2.5 mgl ^-1）和较高 CNT 浓度（10、15 mg l ^-1）的电解质的 Ni-P-CNT 涂层中团聚 CNT 的非均匀分布导致表面缺陷和耐腐蚀性降低。对于更长的暴露时间，由含有 10 mgl ^-1CNT浓度表现出最高的耐腐蚀性能。结果表明，为了获得最高的防腐性能，需要优化电镀浴中 CNT 的分散，并且该最佳要求随着涂层暴露于腐蚀介质的时间的变化而变化。