The Effect of Copper Sulfate Solution Mixed with Averrhoa bilimbi (Kamias) Fruit Extract to the Corrosion Rate of Tin

Abstract

INTRODUCTION

The use of metals has been gaining interest in the field of product manufacturing all through the years. However, the resistance of metals to corrosion has been a major problem. Protective coatings are used which are not economically friendly and eventually blister, unlike electroplating. In the process of electroplating, an additive (with antioxidants for corrosion is formed when metals are exposed to oxygen and water) is needed for better resistance to corrosion. This study aims to determine other environment-friendly additives for copper plating. Kamias extract contains antioxidants which reduce the oxidative damage caused by free radicals and chelating metals namely: flavonoids, vitamin A, and C.

METHODS

For the electroplating procedure to work, the extract was included in the copper sulfate solution. Three preliminaries were conducted in each electroplating with added substances and without. After plating tin, it was exposed to 1% nitric acid, corrosive chemical. Corrosion rates were determined using the metal loss formula.

RESULTS

The results concluded that the corrosion rate of tin with additives was significantly lower than that of tin with 10% hydrogen peroxide, especially the one without additives. SEM photomicrographs were taken to know the nature of the deposition. Other metals, other than oxygen, tin, and copper, were observed in the copper-plated metals. The additive that had the lowest average is the fruit additive or the Averrhoa bilimbi fruit extract. It has 628.40 while the commercial additive had 3351.49, followed by with no additive which is 5287.58.

DISCUSSIONS

Copper-plated tin with additive exposed to nitric acid caused rare corrosion for this acid is a chemical. and rare corrosion only happens when a metal is exposed to chemicals. Since corrosion is produced when a metal is in contact with oxygen and water. Therefore, antioxidant properties in the additive helped in reducing the corrosion rates of tin plates.