Experimental Studies of Hardness Value and Corrosion Behavior of Coated Steel Bar

Abstract

Now-a-days steel is used in various construction structure such as building, bridges, pavement etc., but the major issue with the steel is, it easily gets corroded. Corrosion causes many important structure damage, many methods are used to increase the corrosion property of steel. Electroless coating was one of the modern technique to modify the surface property so that steel corrosion property. NiP coating was applied on steel 304. In this paper, NiP concentration variation and temperature variation was done along with presence or absence admixtures (such as-Lactic acid, Succinic acid, Citric acid) were used. The surface morphology was determined by FESEM Analysis and XRD Analysis, but hardness value and corrosion resistance of the substrate was determined by Vicker's micro-Hardness test and EIS Analysis respectively. Results obtained from these tests showed that the coating thickness increases with increases in NiP concentration as well as temperature increment in presence of admixture. In micro-Hardness test, hardness value of substrate was improved as coating thickness increases. Electrochemical impedance spectroscopy (EIS) test results also showed that corrosion potential of improved coated substrate was enhanced or modified than previous sample substrate.