The effect of coffee powder as a carburizing agent and preventing corrosion

Abstract

Low carbon steel has a carbon content between 0.01% - 0.2% C, has properties of malleability and machining, usually used for machines, machinery and mild steel. The disadvantages of this low carbon steel are its relatively low mechanical strength and poor corrosion resistance. By using coffee powder as a carburizing agent and as an inhibitor corrosion, it is expected that the mechanical strength and corrosion resistance can be increased. This study aims to determine the effect of using coffee grounds in increasing wear resistance, and its hardness and corrosion resistance using coffee powder media. The process is carried out by carburizing at a temperature of 9150C and held for 30 minutes with coffee powder media as charcoal and tempering at a temperature of 3250C to increase its mechanical strength. The next process is testing its corrosion resistance using a coffee powder inhibitor with a percentage of 10 Ppm, 20 Ppm, and 30 Ppm. The results showed an increase in the mechanical strength of low carbon steel by carburizing the process using coffee grounds. There was an increase in the hardness value of the hardness test specimen from 180 HB in raw material to 395.3 HB. In the wear test, there was a decrease in the value of the wear volume from 0.079 mm³ to 0.041 mm³. In testing the corrosion rate using coffee grounds as a corrosion inhibitor medium, it was found that the corrosion rate of the raw material decreased with a value of 2.153 mm / yr to 1.495 mm / yr when using coffee inhibitors with a level of 30 Ppm.