The early corrosion of mild steel in fish farming water inhibited by sea cucumber concentrated solution

Abstract

Today, fish fanning activities are actively in the running as there is an increase in protein and to reduce reliance on the fishes obtained from the sea. However, this activity is costly especially in term of operating costs. At the same time, the equipments are easily exposed to corrosion phenomenon when reacting with water. Thereby, this study was important to see the rate of corrosion that will occur on these equipments to help breeders to cut the spending on maintenance. In this experiment, mild steel was tested using samples of water obtained from the fish farm of Universiti Malaysia Terengganu. In addition, sea cucumber solution was also used in the experiment aimed to test whether it can be used as a inhibition to prevent corrosion, in which in the sea cucumber there exists two antioxidants which are dimutase superoxide (SOD) and catalase (CAT) that can be used to reduce the production of reactive oxygen species (ROS). The concentrations used in this research are O ppm, 300 ppm, 600 ppm, and 900 ppm. The experiments were run for 28 days. Results of samples were taken starting from the first day and up to day seven. The weights of the samples were taken. On day 28, the last samples were taken to measure its final weight. There are several methods that has been used to measure the rate of corrosion from the data collection, the loss weight method,polarization scan and electrochemical impedance spectroscopy. In order to obtain more accurate data. twelve samples were taken on each day. The corrosion rate and inhibition efficiency were calculated in order to find the best solution to be inhibitor.