Corrosion inhibition of zinc in tropical seawater

Abstract

The growing environmental concerns have led to the formulation of corrosion inhibition in tropical seawater. The main objective of this study is to investigate the effect of the corrosion inhibition of zinc in seawater after adding sodium benzoate with different percentage. The samples were immersed in 100% seawater, 10% sodium benzoate, 20% sodium benzoate, 30% sodium benzoate, 40% sodium benzoate and 50% sodium benzoate. The samples were immersed for 30 days and the result were taken every 6 days intervals. The weight loss of the sample was recorded and using the formulae the result were calculated and graph were plotted. Using the weight loss measurements, the corrosion rates of zinc in solutions were determined. With the increment of the sodium benzoate, the weight loss of the zinc sample is decreased. The solution of seawater and 50% sodium benzoate will have the least weight loss and this proved that it will give the least corrosion rate. This will proved that the sodium benzoate inhibit the zinc from the corrosion. There for, the corrosion rate will be decreasing with the increasing of time. The sample morphology had been examined using Metallurgical Microscope to obtain microscopic image of the corrode sample. The sodium benzoate covered the surface of the zinc sample and this behavior then showed that the samples were slowing down the corrosion rate. The use of sodium benzoate is a useful technique for the corrosion inhibition of the zinc in tropical seawater.