Effect of Sintering Temperature on the Morphology and Adhesion Strength of Eggshell Coating on Mild Steel

Abstract

Eggshell waste is rich source of calcium carbonate and can be applied to protect steel pipe from corrosion. Calcium carbonate precipitation can be naturally formed as a coating to protect steel pipe from oxygen diffusion. However, with calcium carbonate formed due to natural process, it is difficult to achieve the adequate thickness and capable of protecting the steel pipe. By adapting his corrosion protection mechanism, application of eggshell is of mild steel to eliminate the lengthy and complicated corrosion control system has been practiced. In this research, the eggshell powder was applied to coat the mild steel substrate using the electrophoretic deposition (EPD) process. The EPD process is simple and cheap. The eggshell was successfully coated on mild steel substrates at deposition voltage ranged between 20 to 100 volts and sintering temperatures at 400, 500 and 600°C. The best coating morphology and adhesion strength were determined at deposition voltage of 100 volts for 1 minute and sintering temperature at 600°C. These conditions are based on the morphology of the eggshell surface and the highest adhesion strength of the coated samples. The finding demonstrates the ability of the eggshell to be coated on steel substrate using the EPD process with good adhesion strength.