Corrosion inhibition study of is : 1062 grade a - low carbon steel in 1m hcl by l – methionine –weight loss, icp-oes and sem-edx studies

The corrosion inhibition characteristics of amino acid L- Methionine on IS : 1062 Grade A - Low carbon Steel in 1M HCl solutions at 300C temperature was studied by using weight loss, Inductively Coupled Plasma Optical Emission Spectrophotometer (ICP-OES) and Scanning Electron Microscope with Energy Dispersive X- Ray analyzer (SEM-EDX) techniques. Measurements were conducted without and with various concentrations of L-Methionine and the inhibition efficiency (IE %) has been studied accordingly. The addition of very small concentration Zinc and potassium iodide as synergizing agents on the corrosion inhibition behavior of L- Methionine was also studied. The highest Inhibition Efficiency (IE %) of 98.80% was observed in the presence of L- Methionine (10-1 moles) with Zinc (15 milli moles) and KI (10 milli moles) as synergizing agents at 300C for an exposure duration of 1hr. These measurements were complemented with ICP-OES examinations of the electrolyte solution, SEM and EDX characterization of the electrode surface. The effect of Zinc and KI as synergizing agents on inhibition efficiency along with combined synergizing effect (Zn+ KI) was also studied.