Corrosion inhibition of mild steel by natural honey and saccarides

Abstract

Mild steel is the most versatile, least expensive and widely used engineering material which has found extensive application in various industries. However, the corrosion resistance of mild steel is relatively limited. This causes many corrosion problems to be arising in the related industries. There are several methods introduce to overcome the corrosion problems. Among these methods, the use of corrosion inhibitor is very popular. In this research project, the natural products such as natural honey and saccharides glucose are used as an inhibitor for mild steel. The objectives of this research are to determine and compare the inhibition efficiency of honey and glucose on mild steel corrosion. There will be seven type solutions [seawater, honey + seawater (1 :300), honey + seawater (1 :60), honey + seawater (1 :30), glucose + seawater (1 :300), glucose + seawater (1 :60) and glucose + seawater (1 :30)] being prepared to used as corrosion medium for the mild steel immersion test. The immersion period was 28 days while every specimens checking was done on 4 days interval. The corrosion rate of the mild steel and the corrosion inhibition of honey and glucose on mild steel were evaluated by using weight loss method, potentiodynamic polarization scan and electrochemical spectroscopy (EIS). The results show that the presence of honey and glucose in seawater was retards the rate of dissolution and hence inhibits the corrosion of mild steel in seawater. Thus, the corrosion rate of mild steel is decreases with the increases of concentration of honey and glucose. Besides, the inhibition efficiency of both honey and glucose are also increases with concentration of honey and glucose. In this research, it shows that both honey and glucose are good inhibitor for mild steel. However, glucose shows much better inhibition efficiency compared to honey.