Abstract

H. Asia Thabassoom^* and J. Felicita Florence

DOI : http://dx.doi.org/10.13005/ojc/380622

Electroless coatings have been used in many industries now days due to their good properties, such as corrosion and wear resistance, hardness and uniform thickness. Nickel sulphate and Sodium tungstate are used as Nickel and tungsten sources respectively, Sodium hypophosphite is used as reducing agent. The effect of Lawsone isolated from Lawsonia inermis Linn leaf extract and found that complexing agent Sodium citrate is replaced by Lawsone which enhances plating properties. In order to characterise Ni-W-P surfaces, SEM, EDAX, and XRD methods are used. We looked at the Ni-W-P corrosion resistance behaviour as well as electrochemical techniques such potentiodynamic polarisation curve and electrochemical impedance spectroscopy. Metal that is electrolessly deposited has good corrosion resistance.

EDAX; Lawsoniainermis Linn leaf; polarization studies; SEM; XRD

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