Research On Preparation Technology And Properties Of Ni-TiN Composite Coating On ABS Plastic Surface

ABS plastic is a commonly used engineering plastic,but its compressive strength and wear resistance are far lower than metal materials.Plastic electroplating technology can effectively improve the wear resistance,corrosion resistance,and heat resistance of plastic materials by coating metal on the surface of plastic through electroplating process.It is a highly practical surface engineering technology.Ultrasonic pulse electrodeposition technology can greatly promote the progress of plastic electroplating technology,but there is currently very little research on this aspect,and the relevant research on the influence of multiple factors on the performance of plastic electroplating nanocomposite coatings has not been found.Therefore,this topic uses ultrasonic pulse electrodeposition method to prepare Ni-TiN nanocomposite coating on the surface of ABS plastic substrate,and explores the codeposition mechanism of Ni²⁺and TiN nanoparticles on the surface of ABS plastic.The main research content of this project is as follows:（1）The metallization process of ABS plastic surface was established and relevant experimental studies were carried out.We have established a process for detecting and removing internal stress on the surface of ABS plastic,conducted relevant experiments,and completed stress relief treatment on the surface of ABS plastic.Established an alkaline oil removal system,determined the optimal oil removal reagent ratio,and completed the alkaline oil removal of ABS plastic matrix.A KMn O₄-H₃PO₄-H₂SO₄roughening system was established and the influence of phosphoric acid content in the system on the roughening effect was investigated.Explored the working mechanisms of sensitization,activation,chemical copper plating,and thickened coatings,and determined the optimal formula and process parameters of sensitizers,activators,chemical plating solutions,and thickened copper plating reagents based on experimental methods.（2）Based on Guglielmi theory,the codeposition process of Ni²⁺and TiN nanoparticles was discussed,and the preparation mechanism of ultrasonic pulse electrodeposition of Ni-TiN composite coating was revealed.An experimental apparatus for ultrasonic pulse electrodeposition was established,and the process parameters for preparing ultrasonic pulse electrodeposited Ni-TiN composite coatings were designed.We designed an experimental plan for the preparation of Ni-TiN composite coatings by ultrasonic pulse electrodeposition,determined the ratio of composite electroplating solution,and optimized the process parameters for coating preparation using orthogonal experiments.An experimental method was established to characterize the surface morphology,microstructure,and properties of Ni-TiN nanocomposite coatings.（3）Based on the optimal process parameters,the effects of TiN nanoparticles suspension amount,ultrasonic power and pulse duty ratio on the surface morphology,microstructure,porosity,microhardness,wear amount,corrosion resistance and friction coefficient of Ni-TiN nanocomposite coating were studied by single factor experiment method.The optimal process parameters for electroplating Ni-TiN nanocomposite coatings on ABS plastics were determined as follows:the suspension amount of TiN nanoparticles was 6 g/L,the ultrasonic power was 150 W,and the pulse duty ratio was 50%.