Effect of bath temperature on corrosion resistance and structure of Cu-Ni alloy electrodeposited by brush plating method

The preparation of Cu-Ni alloy deposits by a brush plating process, and their corrosion, structure, morphology and composition are addressed. The study reveals that the composition, crystalline size and corrosion potential of the films can be controlled by the bath temperature. X-ray fluorescence analysis confirms that Cu-Ni alloy deposits of stoichiometry Cu50.65Ni49.35, Cu45.11Ni54.89, Cu41.95Ni58.05, Cu30.95Ni69.05 are obtained at 30, 40, 50 and 60 degrees C. X-ray diffraction study reveals that the crystalline size varies in the range of 46 to 21 nm when the deposition temperature is varied from 30 to 60 degrees C. The corrosion study revealed that the alloy deposits at higher temperatures show good corrosion resistance. The surface morphology study shows that the higher temperature deposits have smooth surface morphology and small grain size.nm