目的 有效解决单层 Ni-P 镀层厚度薄、孔隙缺陷多、韧性差及耐蚀性不足等核心问题。方法 以X80钢为基体,采用连续化学镀工艺分步制备双层纳米复合镀层。通过响应面法（RSM-BBD）优化镀液配方,以孔隙率为响应值,确定最优工艺参数。结合扫描电子显微镜（SEM）观察镀层表面形貌与微观结构,能谱分析（EDS）表征元素分布,X射线衍射 （XRD）分析物相组成,电化学测试评估耐蚀性能,并通过力学性能测试分析硬度及韧性。结果 双层复合镀层的Ni-W-P/TiO2最佳工艺为TiO2颗粒质量浓度为0.95 g/L,CTAB（十六烷基三甲基溴化铵）为53.68 mg/L,Tween-80(吐温-80)为13.48 mg/L,NiSO4为20 g/L,Na2WO4为30 g/L,Na3C6H5O7为50 g/L,NH4Cl为25 g/L,NaH2PO2为40 g/L,温度为85 ℃,pH为9,且表面结构紧密、厚度显著增加、孔隙率仅为单层 Ni-P镀层的1/10,硬度较单层Ni-P镀层提升 44%,同时韧性也显著改善。在3.5% NaCl溶液中,复合镀层腐蚀电流密度仅为单层Ni-P镀层的56%。结论 结构分析显示TiO2颗粒通过“物理填充+组织细化+化学改性”三条路径提升整体性能,有效解决了单层Ni-P镀层的性能缺陷,实现了耐蚀性与力学性能的同步提升。
Abstract
Ni-P coatings are widely used due to their excellent corrosion resistance, wear resistance, and process controllability. However, single-layer Ni-P coatings exhibit significant limitations in practical applications. On one hand, single-layer coatings are thin, and defects such as pores and microcracks inevitably generated during the chemical deposition process can easily form penetrating pinholes, accelerating coating failure. On the other hand, while Ni-P coatings possess high hardness, their poor toughness makes them prone to cracking or peeling under external forces, severely compromising the durability of their protective performance. Once the coating is damaged, the exposed Fe substrate and the Ni-P coating form a "large cathode-small anode" galvanic corrosion effect, accelerating the corrosion process of the substrate. To address the issues of single-layer Ni-P coatings in terms of thin thickness, numerous pore defects, poor toughness, and insufficient corrosion resistance, this study investigates two approaches: increasing the coating thickness and improving the surface properties of the coating. The results indicate that the double-layer structure effectively increases the overall coating thickness, extends the diffusion path of corrosive media and optimizes stress distribution through the two layers' synergistic interaction. This significantly enhances the coating's corrosion resistance and structural stability. A double-layer nanocomposite coating is prepared via a continuous chemical plating process with X80 pipeline steel as the substrate. First, an inner layer of Ni-P is deposited onto the X80 steel substrate to create a uniform, smooth base for subsequent surface deposition. Then, an outer layer of Ni-W-P doped with TiO2 nanoparticles is formed on its top. Response surface methodology is combined with Box-Behnken design (RSM-BBD) for optimizing chemical plating solution formulation. Porosity is selected as the key response variable. The interactions between TiO2 nanoparticles, CTAB and Tween-80 are analyzed and a mathematical model is created. The Ni-P/Ni-W-P/TiO2 double-layer nanocomposite coating is successfully prepared. The optimal process parameters are as follows: TiO2 particle concentration of 1 g/L, odium citrate of 50 g/L, NaH2PO2 of 0.95 g/L, CTAB of 53.68 mg/L, Tween-80 of 13.48 mg/L, NiSO4 of 20 g/L, sodium tungstate of 30 g/L, NH4Cl of 25 g/L, temperature of 85 ℃, and pH of 9. Scanning electron microscopy (SEM) is used to investigate the coating and analyze its surface morphology and microstructure. Element distribution is characterized by energy dispersive spectroscopy (EDS) and phase composition is analyzed by X-ray diffraction (XRD), corrosion resistance is evaluated by electrochemical testing, and hardness and toughness are assessed through mechanical property tests. The prepared double-layer composite coating exhibits a dense surface structure, with a porosity only one-tenth that of the single-layer Ni-P coating. Its hardness is 44% higher than that of the single-layer Ni-P coating, and its toughness is also significantly improved. The corrosion current density of the composite coating, measured in a 3.5wt.% NaCl solution, is significantly lower, measuring just over half (56%) of the value for the single-layer coating. Ni-P coating. Structural analysis reveals that TiO2 particles synergistically enhance the overall performance through three mechanisms: "physical filling + microstructure refinement + chemical modification". This effectively resolves the performance deficiencies of the single-layer Ni-P coating, achieving simultaneous improvement in both corrosion resistance and mechanical properties.
关键词
X80 /
Ni-P/Ni-W-P/TiO2纳米复合镀 /
响应面法 /
硬度 /
耐蚀性 /
纳米改性
Key words
X80 /
Ni-P/Ni-W-P/TiO2 nanocomposite plating /
response surface methodology /
hardness /
corrosion resistance /
nanomodification
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基金
高校院所科技人员服务企业项目（25GXKJRC00035）
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