STUDIES REGARDING NICKEL ELECTRODEPOSITION FROM WATTS BATH WITH ADDITION OF POLYVINYLPIRROLIDONE AND SODIUM LAURYL SULFATE

This work is based on some studies about the influence of polyvinylpyrrolidone (PVP) and sodium lauryl sulfate as far as concern their influence on the nickel electrodeposition processes from Watts bath. PVP is a wetting agent which improves the quality of deposited layers. Sodium lauryl sulfate is a wetting agent too, which improves adherence of the deposited layers. PVP actions through the inhibition of adsorption of (NiOH) + species on the cathode surface. Sodium lauryl sulfate is expecting to potentate PVP action in a synergic mode that will permit to achieve a better growth of the crystals on the electro-crystallization process, and further, a better quality of the deposited layers. Our results are able to promote using of these additives for future commercial applications. SEM-EDX techniques and optical microscopy were used with the aim to emphasize the uniformity, the continuality and the micro-structural granularity of the electrodeposited layers, correlated with chemical composition and metallic brightness, through absorption spectroscopy.