Corrosion Inhibition of Carbon Steel Using Chitosan as an inhibitor in 3.5% NaCl Medium

Lilik Suprianti,Sukamto Sukamto,Ellyn Evina Ellys Simanjuntak Ellyn Evina Ellys Simanjuntak,Dwi Hery Astuti Dwi Hery Astuti,Khafid Ubay Ilyas Khafid Ubay Ilyas

doi:10.33005/ijeise.v1i02.32

Abstract

Carbon steel is a metal that is widely used for the construction of industrial and marine applications. Hence, seawater is one of the corrosive mediums due to its Natrium Chloride (NaCl) content as a strong electrolyte. One method to control the corrosion rate is by adding the inhibitor. Chitosan has been chosen as inhibitor corrosion because of non-poisonous and green material. Corrosion inhibition of carbon steel in chitosan inhibitor presence in 3,5% NaCl medium was studied using potentiodynamic polarization technique. This study aims to understand the effect of temperature and inhibitor concentration on carbon steel's corrosion behavior. This study also determined adsorption constant value of chitosan on the carbon steel surface. The corrosion rate has been analyzed by using potentiodynamic polarization. Firstly, carbon steel is prepared by cutting them in cuboid shape by dimensions 4cmx 1cm x 3mm. Secondly, a 3.5 % sodium chloride solution is prepared by dilute NaCl crystal into demineralized water. The next step is inhibitor preparation by dissolve chitosan powder in the acid solution. The corrosion rate is analyzed in different temperatures, various from 30-70oC, and chitosan concentration varied from 0 to 250mg/l. The results showed that chitosan is a promising corrosion inhibitor in sodium chloride medium. The inhibition efficiency at 30oC reaches 84.92% with a chitosan concentration of 250 mg/L.

Highlights

Carbon steel has been widely used in the chemical industry, such as tanks and piping[1]
The benefit of this study is to evaluate whether chitosan can be applied as a corrosion inhibitor at the seawater evaporation process in salt production or desalinate water plants
Potentiodynamic polarization test is used to determine the corrosion rate of the specimen. It is found out inhibition efficiency and protection characteristic of chitosan inhibitor on the surface of carbon steel in 3.5% Natrium Chloride (NaCl) solution medium

Summary

Introduction

Carbon steel has been widely used in the chemical industry, such as tanks and piping[1]. Carbon steel is used in Multi-stage flash evaporation (MSF) tanks [2]. The operation condition, such as temperature, pH, and chemical content, can cause corrosion on metal. Corrosion is the degradation of material properties due to interactions with their environments. Corrosion of most metals (and many materials for that matter) is inevitable. While primarily associated with metallic materials, all material types are susceptible to degradation[3]

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