Effect of Inhibitor Concentration and Immersion Time on the Corrosion Rate and Inhibition Efficiency of AISI 1019 Steel in Inhibited Seawater Environment

Emmanuel Iyeni,Cornelius Oghenetega Obemure

doi:10.11648/j.ajmme.20200403.15

Abstract

The effect of inhibitor concentration and immersion time on the corrosion rate and inhibition efficiency of AISI 1019 steel in seawater environment were investigated by means of weight loss measurement (WLM) at an interval of 6days for a period of 60 days. AISI 1019 steel were immersed in seawater solution in the absence and presence of varying inhibitor concentrations of potassium chromate (PC), Sodium Nitrite (SN), Methyl Orange (MO), Methyl Red (MR), Terminalia Catappa Leaves (TCL) Extract, Carica papaya Leaves (CPL) Extract. The results showed that there is an increase in inhibition efficiency with increase in inhibitor concentration and decrease in inhibition efficiency with increase in immersion time. The inorganic inhibitor (potassium chromate), inorganic inhibitor (Sodium Nitrite), the organic Inhibitor (Methyl Orange), the organic inhibitor (Methyl Red), the green inhibitor (Terminalia Catappa Leaves) and green inhibitor (Carica Papaya Leaves) produced their best inhibition efficiency of 71.94%, 634%, 68.94%, 68.32%, 62.7%, 59.79% respectively at a concentration of 10g/L. From the result obtained, the potassium chromate inhibitor has better inhibitory property than other inhibitors, which revealed that it is best suited for inhibition of corrosion of mild steel in seawater environment.

Highlights

Corrosion is often referred to as metallic deterioration by chemical attack or reaction of a metal with its environment. [9]
Corrosion reactions cause metals to return to their natural ores
It shows that the corrosion rate of the control solution increases linearly with immersion time as seen in Figure 1 to Figure 6, indicating that seawater is highly corrosive under studied conditions

Summary

Introduction

Corrosion is often referred to as metallic deterioration by chemical attack or reaction of a metal with its environment. [9]. Corrosion is often referred to as metallic deterioration by chemical attack or reaction of a metal with its environment. Metallic corrosion is the passage of the metal into the chemically combined state. Corrosion reactions cause metals to return to their natural ores. Aqueous Corrosion of any metal occurs by chemical reaction and by electrochemical mechanism. Corrosion may be considered as a redox process in which an oxide coating is formed on the surface of the metal/alloy undergoing the process. It requires oxygen and moisture to occur

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Results

Conclusion