Synthesis And Prosperties Of Self-sensitization Luminescent Composite Layers

Nickel-based composite coatings as important means of improve workpiece surface friction resistance and corrosion resistance properties. It is widely used in industrial environments, such as high wear and corrosion.Rare earth luminescent material as high brightness luminescent material has been widely used in coating material, such as: building decoration, warning marks, artificial landscape.Light composite coating layer as a new kind of indicative with using luminescent material excellent instruction function and the workpiece surface metal coating is excellent to realize work status online monitoring.Luminescent composite metal coatings has been used in wear resistance coating online in recent years.The self-sensitization luminescent coating has been fabricated by electroplating technique from a modified Watts bath containing rare earth phosphor particles containing blue-emitting(BaMgAl₁₁O₁₇:Eu²⁺), red-emitting（Y2O3;Eu3+）, green-emtting(CeMgAl₁₁O₁₉:Tb³⁺). Using excellent luminous indicator property of fluorescent particles, the light-emitting properties of novel coating can serve as an indicator,warning or corroding when and where the coating has warn off or wear light attenuation.It is easy to be applied to monitor the wear and corroded condition of industrial coating.The surface morphology, microstructure, wettability, deposition rate, hardness,self-sensitization luminescent property, abrasive resistance, corrosion resisting property of the obtained composite coating. The monitoring property and demineralized matrix of the in-situ luminescent composite metal films has also been investigated. The photoluminescence, surface morphology, microstructure, self-sensitization luminescent property of the obtained composite film, are characterized usingfluophotometer,fluorescent, microscope, scanning, electronmicroscopy（SEM）, X-ray diffraction（XRD）, electrochemical polarization, electrochemical impedance spectroscopy（EIS）techniques and dry friction techniques. The results find that the non-ionic PEG（polyethylene glycol） and cationic CTAB（cetyltrimethylammonium bromide）surfactants were observed to increase the particle content of the deposit from 35⁷5%.The rare earth phosphor particles are uniformly dispersed into Ni matrix caused refining of the composite coating grain size, Y₂O₃:Eu³⁺fluorescent particles changed the coating layer crystalline orientation and grain refinement, the coating hardness increased significantly by containing CeMgAl₁₁O₁₉:Tb³⁺and Y₂O₃:Eu³⁺fluorescent particles,BaMgAl₁₁O₁₇:Eu²⁺ make the coating morphology presents knot. Three primary colours light emission in rare earth phosphor particles of in-situ luminescent coating is observed to be quenched due to the metal nickle. The nickle atom act as electronic traps band.Electronic transfers from one side of the low work function of the fluorescent particles to high work function metal Ni and appear contact quenching. The feasibility of luminescent layer to monitoring corrode of coating has also been demonstrated. Dry friction experiments show that CeMgAL₁₁O₁₉:Tb³⁺ and Y₂O₃:Eu³⁺ adhesive wear particles can play a role in friction and wear of antifriction and reduced the coefficient of friction and wear extent. Meanwhile, the results obtained by polarization curves and EIS methods show that, when compared with the traditional polycrystalline Ni film, the polarization resistance enhanced 400⁵00(KΩ·cm^-2). The reduce of luminescent intensity exhibited monitoring and coating drooped after corrosion in the NaCl solution and the Y₂O₃:Eu³⁺ particle play the enhanced corrosion resistance.