อิทธิพลของสารเติมแต่งประเภทกัมในการชุบนิเกิลด้วยไฟฟ้า

Abstract

Presently, Low carbon steel is widely used in various industries. However, Low carbon steel has low corrosion resistance. Corrosion affects safety issues and may result in reduction of service lifetime. One way to prevent this is by electroplating, nickel electroplating is the most common and frequently used in electroplating processes. It is generally enhanced with additives. Gum is used as an additive for preventing corrosion. Gum is also easy to find and cheap. In this research work, the effect of adding gelatin, gum arabic and guar gum in a nickel electroplating bath at 5V for 25 minutes was investigated. SS400 low carbon steel was prepared as a substrate. The morphology of surface coating was also characterized by Scanning Electron Microscopy (SEM). It was found that an average thickness of nickel coating is 45.791±2.538 μm. Nickel plating with gum additives showed higher hardness than the one without additive. The hardness of nickel plating with gum arabic is about 357±6.08 HV. Its morphology is smooth while morphologies of nickel plating with gelatin and guar gum are uneven or crack. As a result of lower hardness. Gum additives affect the color of the samples. The effect of corrosion was examined by using the immersion in 3.5% NaCl solution for 24 days. Conclusion, using gum additives into the in nickel plating bath provides low a corrosion rate compared to nickel plating without additives. Nickel plating withgum arabic demonstrated the lowest corrosion rate compared to other additives.