目的 针对传统钢带连续镀锌技术面临的能耗与环保挑战,探究连续热喷射物理气相沉积（PVD）工艺作为高效替代方案的可行性,重点解决其蒸发-热喷射耦合机制及镀层组织性能研究不足的问题。方法 基于赫兹-克努森方程和阻塞流理论,构建了连续蒸发-热喷射动力学模型并进行了实验验证。采用非连续真空蒸镀和连续热喷射PVD工艺制备纯锌镀层,结合SEM、XRD、划痕实验及电化学阻抗谱等手段,系统对比了两种工艺的成膜特性。结果 连续热喷射PVD工艺沉积速率由5 nm/s提升至1.32×104 nm/s;镀层密度由86.3%提升至97.4%,镀层附着力临界载荷由24 316 mN增加至34 618 mN,腐蚀电流密度由66.4 μA/cm²降低至27.8 μA/cm²,中性盐雾出现红锈的时间由48 h延长至72 h。结论 对比非连续真空蒸镀,连续热喷射PVD工艺在实现超高速沉积的同时,提高了镀层质量与耐蚀性能,表现出良好的应用潜力。
Abstract
To address the critical limitations of traditional continuous galvanizing technologies, specifically high energy consumption, poor wettability on advanced high-strength steels, and environmental risks like hydrogen embrittlement, this study proposes and systematically investigates a Continuous Thermal Jet-PVD process. While conventional batch physical vapor deposition (PVD) offers an eco-friendly alternative, it has historically suffered from low deposition efficiency unsuitable for industrial-scale production. To overcome this bottleneck, this work establishes a comprehensive theoretical model coupling Hertz-Knudsen evaporation kinetics with choked-flow fluid dynamics. This coupled model quantitatively describes the complex mass transfer mechanism, tracing the zinc vapor journey from the evaporation source, through a vapor distribution box (VDB) where pressure stabilizes, to a supersonic Laval nozzle. The model accounts for critical fluid dynamic factors, including the choking flow threshold (pressure ratio < 0.53) and the acceleration of vapor to supersonic speeds (Ma > 1) at the nozzle exit, which provides the high kinetic energy necessary for dense film growth.
The theoretical framework is rigorously validated against experimental data obtained from a custom-built continuous thermal jet-PVD system applied to SPCC cold-rolled steel strips at substrate temperature of 160 ℃. The results demonstrate a linear correlation between deposition thickness and crucible temperature within the process window of 913 K to 943 K. The calculated theoretical thickness (9.49-15.42 µm) show a consistent alignment with measured values (9.22-13.2 µm), with minor deviations attributed to viscous dissipation and non-ideal Rayleigh flow effects within the transport piping. Most significantly, the continuous thermal jet-PVD process achieves an ultra-high deposition rate of 1.32×104 nm/s, representing a massive 2,600-fold increase compared to the 5 nm/s rate typical of non-continuous vacuum evaporation.
Microstructural characterization via SEM and XRD reveals that the high-energy jet deposition fundamentally alters the coating's growth mode. Unlike the porous, granular structure with random orientation observed in vacuum evaporation, the thermal jet-PVD coatings exhibit a highly dense, fiber-like morphology. Image binarization analysis quantifies this improvement, showing a dramatic reduction in cross-sectional porosity from 13.7% to 2.6%. Crystallographic analysis identifies a distinct texture evolution: the high deposition rate suppresses atomic surface diffusion, preventing the formation of thermodynamically stable (002) and (100) planes. Instead, a metastable (102) preferred orientation is induced. This is quantitatively confirmed by the Scherrer equation, which shows the (100) crystallite size shrinking from 60 nm to 30.1 nm, while the (102) crystallite size increases to 74.5 nm. Density Functional Theory (DFT) calculations further support this, linking the texture evolution to the minimization of total free energy via a balance between surface and elastic energies under these specific kinetic constraints.
These microstructural modifications translate into superior macroscopic performance. Scratch tests demonstrate a 42% increase in adhesion strength, with the critical load (Lc3) rising from 24,316 mN to 34,618 mN. The failure mechanism shifts from brittle peeling to ductile deformation, attributed to the activation of pyramidal <c+a> slip systems in the (102)-oriented grains, which accommodate local stress more effectively than the basal plane orientation of evaporated coatings. Furthermore, the electrochemical corrosion current density decreases from 66.4 μA/cm2 to 27.8 μA/cm2, and the neutral salt spray (NSS) tests show that the time to red rust appearance extends from 48 hours to 72 hours.
This enhanced corrosion resistance is directly attributed to the elimination of through-thickness pores and the dense stacking of grains, which effectively block the infiltration of corrosive media. In conclusion, the continuous thermal jet-PVD process not only meets industrial efficiency demands but also yields coatings with superior structural integrity and corrosion resistance.
关键词
连续镀锌 /
物理气相沉积 /
热喷射 /
沉积机理 /
纯锌镀层 /
显微组织 /
耐蚀性 /
结合力
Key words
continuous galvanizing /
physical vapor deposition /
thermal jetting /
deposition mechanism /
pure zinc coating /
microstructure /
corrosion resistance /
adhesion
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