Effect of Chloride in The Electrochemical Degradation of Carbon Steel in E40 Fuel Ethanol Applications

O.O Joseph,S.A Afolalu,C.O Asagba,A Busari,S.O Banjo,A.O Inegbenebor,F.A Ishola

doi:10.1088/1757-899x/1107/1/012147

O.O Joseph, S.A Afolalu + Show 5 more

Open Access

https://doi.org/10.1088/1757-899x/1107/1/012147

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Abstract

The effect of different chloride concentration on the corrosion rate of carbon steel in E40 is presented in this study. The corrosion rates for each sample were examined using gravimetric method and polarization measurement. The samples were immersed into E40 fuel grade ethanol containing NaCl concentrations of (0, 8, 16, 24 and 32 mg/L) for a minutest of 10 days and a maximum of 40days. Results obtained from both gravimetric and polarization measurements show that as chloride concentration amplified from 0 mg/L to 32 mg/L, there was an increase in corrosion rate of the carbon steel with the exception of a slight decrease at 24 mg/L on the 30th and 40th day. Corrosion rate was observed to be dependent on exposure time.

Highlights

The production of fuel grade ethanol relentlessly expanded in the course of recent decades
Results obtained from both gravimetric and polarization measurements show that as chloride concentration amplified from 0 mg/L to 32 mg/L, there was an increase in corrosion rate of the carbon steel with the exception of a slight decrease at 24 mg/L on the 30th and 40th day
The effect of increasing chloride concentration was studied and it was observed that on the 10th and 20th days, corrosion rate sporadically increased as chloride increased up till 32 mg/L

Summary

Introduction

The production of fuel grade ethanol relentlessly expanded in the course of recent decades. As of late numerous nations have begun to advance the utilization of biofuels or other sustainable energizes to lessen ozone depleting substance discharge and to expand fuel sources Because of this purpose, there has been an expansion of the ethanol content in ethanol–gasoline blends of late. Due to ethanol’s hygroscopic nature and impurities present [1,2,3,4,5,6,7,8,9,10] One of these impurities accelerating corrosion is chloride introduced most times during the production process of the fuel grade ethanol and it is recognised to cause SCC (stress corrosion cracking). Published under licence by IOP Publishing Ltd examining the effect of varying concentration of chloride, an impurity in E40 fuel ethanol application on carbon steel degradation. Reference tests were conducted in the non-appearance of chloride

Immersion Test

Polarization Test

Chloride effect on mass loss corrosion rate

Conclusion