Microstructural, mechanical and electrochemical properties of a Ti-Si-B-C nanocomposite coating with different Si percentages on 4130 steel were investigated. All the films with different SI contents in the range of 10 to 12 µm thickness showed amorphous structures by X-ray diffraction. The hardness decreased with the increase of Si content in Ti-Si-B-C film. The particle size, pores, roughness and phases were responsible for the decrease of hardness with the increase of Si content. Electrochemical behavior is studied using open-circuit potential, impedance spectroscopy (EIS) and anodic polarization methods in 3.5 wt pct NaCl solution. The corrosion current density (icorr) was much lower, 0.45 to 2.34 µA/cm², with varying Si content compared with uncoated steel (9.37 µA/cm²), and passivation behavior was observed during the polarization study. The EIS fit model suggested the presence of a duplex oxide layer on the Ti-Si-B-C nanocomposite coatings. The Ti-Si-B-C coatings with lower Si (24 pct) content showed the best corrosion resistance compared with higher Si content (36 to 52 pct). Overall, the present study suggests that the hard Ti-Si-B-C nanocomposite coating significantly improved the corrosion resistance of 4130 steel.

研究了4130钢上不同硅含量的Ti-Si-BC纳米复合涂层的组织，力学和电化学性能。所有与在10至12的范围内不同的SI内容的膜μ米厚度用X射线衍射显示出无定形结构。随着Ti-Si-BC膜中Si含量的增加，硬度降低。粒度，孔，粗糙度和相是造成硬度随硅含量增加而降低的原因。使用开路电势，阻抗谱（EIS）和阳极极化方法在3.5 wt％的NaCl溶液中研究电化学行为。腐蚀电流密度（icorr）低得多，为0.45至2.34 µ A / cm ²，与未涂覆的钢相比变化Si含量（9.37 μ A /厘米²）中，并在偏振研究期间观察到的钝化行为。EIS拟合模型表明，Ti-Si-BC纳米复合涂层上存在双相氧化层。较低的Si（24 pct）含量的Ti-Si-BC涂层与较高的Si含量（36至52 pct）相比，具有最佳的耐腐蚀性。总体而言，本研究表明，Ti-Si-BC纳米复合硬质涂层显着提高了4130钢的耐腐蚀性。