Effect of Adenine Concentration on the Corrosion Inhibition of Aisi 304l Steel in 1.0m Sulphuric Acid Solution

Abstract

Over the years considerable efforts have been deployed to finding suitable (safe and friendly) corrosion inhibitors of organic origin in the various aggressive acid media encountered in service especially during the processes of pickling, industrial acid cleaning, acid descaling and oil well acidizing. In this research the effect of adenine concentration on the corrosion inhibition of AISI 304L in 1.0 M sulphuric acid solution has been investigated. The research was achieved by using 1M concentration of acid solution and varied inhibitor concentration. Readings were obtained every 240hours (10 days) for a period of 1200hours (50 days). Weight loss, corrosion penetration rate, inhibition efficiency and degree of surface coverage were calculated. Results obtained revealed that adenine is an effective and safe corrosion inhibitor for AISI 304L in 1.0M sulphuric acid solutions. Analysis of the results showed that the inhibition efficiency and surface coverage increases with increasing adenine concentration till a certain maximum value, causing a decrease in corrosion penetration rate and weight loss. A maximum value of inhibition efficiency of 89.56% was achieved at 0.011M adenine concentration after 10 days. This gave a surface coverage of 0.8956 and corrosion penetration rate of 0.022132mm/yr. Hence, the best adenine concentration for the corrosion inhibition of alloys 304L in 1.0M sulphuric acid solution to obtain optimum inhibition efficiency is 0.011M.

Keywords: Corrosion, AISI 304L Steel, Inhibition efficiency, Degree of Surface coverage, 1.0M Sulphuric Acid Solution