Modification Research Of Zinc Composite Coating Under Marine Erosion And Biofouling Environment

Marine erosion and biofouling have caused serious damage to marine engineering equipment,and its protection has always been the focus of research.By using electrodeposition technology,the functional compound zinc coating was prepared by adding wear-resistant organic metal transition compounds and nano photocatalytic bactericidal materials in the sulfate bath system,and using the physical means of ultrasonic and agitation.The composite coating was characterized by scanning electron microscope,X ray diffraction,electron energy spectrum element analysis,atomic force microscope and abrasion meter.The corrosion resistance and biofouling properties of the coating were tested by electrochemical impedance spectroscopy,potentiodynamic polarization and bactericidal test.This paper first explores the effect of ultrasonic assistance on the properties of zinc coating.The results show that the introduction of ultrasound affects the electrodeposition of zinc,reducing the grain size of the coating,making the surface more compact and even,reducing the surface roughness of the coating and increasing the wear resistance of the coating.With the increase of ultrasonic power,the corrosion resistance of the coating is also increasing.On the basis of ultrasonic assistance,the effect of ferrocene additives was further studied.The results showed that the addition of ferrocene decreased the deposition potential and increased the current efficiency of the electrodeposition process.The surface of composite coating has hexagonal crystal structure,the surface is more bright and dense,and the surface roughness decreases.Through electrochemical tests,it is found that ferrocene composite coatings with 15 W ultrasound assisted have good corrosion resistance in natural seawater and alkaline solution.Nano-BiVO₄ were used as additives and composite coatings were prepared under ultrasonic assisted conditions,the properties of composite coatings were explored.It is found that the deposition potential is positively shifted with the introduction of nano-BiVO₄.Through the characterization test,it is found that nano-BiVO₄ particles are successfully combined on the surface of the coating,and with the increase of ultrasonic power,the amount of adsorption increases.Electrochemical tests showed that the corrosion resistance of composite coatings it is found that BiVO₄ composite coatings with 15 W ultrasound assisted have good corrosion resistance in natural seawater.The bactericidal property of the composite coating was tested under the visible light condition.The results showed that the composite coating with ultrasonic power of 45 W had the best bactericidal property.