Sahir M. Aziz
Al-Nahrain University
Iraq
Title: Corrosion of carbon steel in CO2 gas-salt solution controlled by cathodic protection
Biography
Biography: Sahir M. Aziz
Abstract
Corrosion tests of carbon steel in two phase flow of liquid–gas (CaCO3 solution -CO2 gas) under different operating conditions of temperatures, agitation velocity, gas flow rate, and time were investigated using electrochemical polarization technique. Flat blade disc turbine mixer was used to simulate the two phase flow conditions. Cathodic protection was used to protect carbon steel in salt solution-CO2 mixture by using zinc as sacrificial anode under different operating conditions of flow rate of CO2, agitation velocity, and temperature by measured corrosion potential and weight loss method. The corrosion rate represented by limiting current density (iL) in two phase brine-CO2 mixture, decreases with the increase in agitation velocity depending on flow rate of CO2, temperature, and time. In general, increasing CO2 gas flow rate caused a clear decrease in corrosion rate especially at high agitation velocity. Good corrosion protection percent was attained which under not sever corrosion conditions reached to 85%. In addition, the variations of corrosion potential with time for both metals (CS and Zn) were determined as well as the loss in weigh for each metal.