Preparation of electroless Ni-P composite coatings containing nano-scattered alumina in presence of

• 作 者: S.Afroukhteh C.Dehghanian M.Emamy
• 机 构: University of Tehran,College of Engineering,School of Metallurgical and Materials Engineering,Tehran
• 出 处: Progress in Natural Science:Materials International
• 发表日期: 2012年04期
• 关键词: electroless surfactant alumina polymeric sized scattered coated agglomeration in

Ni-P electroless coating was applied on low carbon steel with the incorporation of different amounts of nano Al2O3 powder (ranging from 3g/l to 30 g/l) in electroless bath. Corrosion properties and microstructures of the coating were studied. The dispersion stability of alumina colloidal particles stabilized by polymeric (non-ionic) surfactants in an electroless bath was also investigated. The surface morphology and the relevant structure were evaluated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Corrosion behavior of the coated steel was evaluated by electrochemical impedance spectroscopy (EIS) and polarization techniques. The results showed that increasing alumina concentration not only changed the surface morphology, but also promoted the corrosion resistance. Addition of surfactants has an indirect effect on the amount of the incorporated particles. Meanwhile, in the presence of surfactant, corrosion resistance of Ni-P coating containing even a small quantity of alumina was improved since a stabilized bath was obtained.

Ni-P electroless coating was applied on low carbon steel with the incorporation of different amounts of nano Al2O3 powder (ranging from 3 g / l to 30 g / l) in electroless bath. Corrosion properties and microstructures of the coating were studied. The dispersion stability of alumina colloidal particles stabilized by polymeric (non-ionic) surfactants in an electroless bath was also investigated. The surface morphology and the relevant structure were evaluated by scanning electron microscopy (SEM) and X-ray diffraction (XRD) coated steel was evaluated by electrochemical impedance spectroscopy (EIS) and polarization techniques. The results showed that increasing alumina concentration not only changed the surface morphology, but also promoted the corrosion resistance. Addition of surfactants has an indirect effect on the amount of the incorporated particles . In the presence of surfactant, corrosion resistance of Ni-P coating containing even a small quantity of alumina was improved since a stabilized bath was obtained.