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A platform for research: civil engineering, architecture and urbanism
An investigation on effects of heat treatment on corrosion properties of Ni–P electroless nano-coatings
AbstractElectroless Ni–P coatings are recognized for their excellent properties. In the present investigation electroless Ni–P nano-crystalline coatings were prepared. X-ray diffraction technique (XRD), scanning electron microscopy (SEM), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were utilized to study prior and post-deposition vacuum heat treatment effects on corrosion resistance together with the physical properties of the applied coatings.X-ray diffraction (XRD) results indicated that the As-plated had nano-crystalline structure. Heat treatment of the coatings produced a mixture of polycrystalline phases. The highest micro-hardness was achieved for the samples annealed at 600°C for 15min due to the formation of an inter-diffusional layer at the substrate/coating interface.Lower corrosion current density values were obtained for the coatings heat treated at 400°C for 1h. EIS results showed that proper heat treatments also enhanced the corrosion resistance, which was attributed to the coatings’ structure improvement.
An investigation on effects of heat treatment on corrosion properties of Ni–P electroless nano-coatings
AbstractElectroless Ni–P coatings are recognized for their excellent properties. In the present investigation electroless Ni–P nano-crystalline coatings were prepared. X-ray diffraction technique (XRD), scanning electron microscopy (SEM), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were utilized to study prior and post-deposition vacuum heat treatment effects on corrosion resistance together with the physical properties of the applied coatings.X-ray diffraction (XRD) results indicated that the As-plated had nano-crystalline structure. Heat treatment of the coatings produced a mixture of polycrystalline phases. The highest micro-hardness was achieved for the samples annealed at 600°C for 15min due to the formation of an inter-diffusional layer at the substrate/coating interface.Lower corrosion current density values were obtained for the coatings heat treated at 400°C for 1h. EIS results showed that proper heat treatments also enhanced the corrosion resistance, which was attributed to the coatings’ structure improvement.
An investigation on effects of heat treatment on corrosion properties of Ni–P electroless nano-coatings
Rabizadeh, Taher (author) / Allahkaram, Saeed Reza (author) / Zarebidaki, Arman (author)
2010-02-15
6 pages
Article (Journal)
Electronic Resource
English
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