Abstract—Nanocrystalline nickel coatings were prepared from a Watts bath using pulse current (PC) condition. To investigate the temperature effect on the crystallite size and residual stress of the nano-nickel coatings, The temperature of the electroplating bath was maintained at 35 °C, 40 °C, 50 °C, 55 °C, and 60 °C respectively. X-ray diffraction (XRD) analysis was performed to determine the crystallite size, relative texture coefficient, and residual stress of the studied coatings. The experimental results show that with increasing temperature of the Watts bath, the average crystallite size, relative texture coefficient of crystallographic plane (200) (same direction as (100)), and compressive residual stress of nanocrystalline nickel coatings increase. It is concluded that moderately increasing the temperature (up to about 60 °C) in the process of nanocrystalline nickel coating production will promote the preferred orientation of crystallographic plane (100) and the compressive residual stress, which enhances nickel crystal compaction, coating adhesion, and coating integrity.
Keywords— Crystallite size, Electro-deposition, Nano-nickel coating, relative texture coefficient, Residual stress, Watts bath temperature.
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