Journal
MATERIALS & DESIGN
Volume 31, Issue 7, Pages 3174-3179Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2010.02.027
Keywords
Coating; Heat treatment; Corrosion
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Electroless 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 degrees C for 15 min 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 degrees C for 1 h. EIS results showed that proper heat treatments also enhanced the corrosion resistance, which was attributed to the coatings' structure improvement. (C) 2010 Elsevier Ltd. All rights reserved.
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