In this work, TiNi samples were prepared by Selective Laser Melting (SLM) technology, and the influence of microstructure, fluoride ion, and pH value on corrosion behavior in a saline environment was investigated and compared with TiNi alloy fabricated by traditional forging technology. The results indicated that the corrosion resistance of the SLM sample was slightly superior to that of the wrought sample in a saline environment due to the uniform and dense oxide film formed on the SLM sample surface. However, in acidic Artificial Saliva Solution (ASS) containing fluoride ions, the corrosion current density of the SLM sample increased from 9.85 × 10⁻² to 13.9 μA/cm² because of the presence of F⁻. Fluorine ions disrupted the passive film on the surface, and the Ti-F compound formed in the film, which deteriorated the corrosion resistance of the SLM sample. The increase in fluoride concentration and the decrease in pH value could accelerate the corrosion of the SLM sample.

Modified multimodal (MMP) Cr₃C₂–NiCr coatings were fabricated by high-velocity oxy-fuel (HVOF) spraying deposited on a CuCrZr alloy substrate. However, due to the lack of its inevitable porosity, an additional laser re-melting (LRM) approach is highly required to improve the coating performance. Therefore, the LRM technique is employed in this study to improve the microstructure properties of an MMP Cr₃C₂–NiCr coating by HVOF. Solid-state phase transformation from Cr₃C₂ to Cr₇C₃ occurred during the LRM process. After the LRM process, the coating exhibits the presence of Cr₃C₂ nanoparticles that serve as reinforcement. These nanoparticles demonstrate minimal lattice misfit and exhibit high stability throughout the LRM process. The surface of the coating undergoes modification, resulting in the formation of homogeneous nano (20–130 nm), micron (150 nm to 0.3 μm), and submicron (2–3 μm) Cr₃C₂ structures, along with high-density microstructures, after the LRM process. Nano-Cr₃C₂ particle reinforced with high total work function and incredibly increased corrosion rate significantly improves coating corrosion resistance. Overall, porosity decreased from 3.9% of the HVOF coating to 0.3% of the LRM. As a result, the current density of anticorrosion decreased from 33.7 to 4.35 µA·cm⁻², and the Vickers microhardness average values ranged from 1,050 to 1,300 HV_0.3, indicating improved microstructure development and related properties.

By attaching ferroferric oxide (Fe ₃ O ₄ ) to drug-carrying carbon nanotubes (CNTs), we generated a new Span-PEG composite with Fe ₃ O ₄ -CNT multifunctional microbubbles for inflammation and thrombus niduses.