Performance Evaluation of a Potent Green Inhibitor on 6061 Aluminum Alloy Under Liquid/Solid Jet Impingement

Erosion corrosion inhibition of 6061 aluminum alloy in artificial sea water in a jet impingement rig was studied using eco-friendly green inhibitor glucose amine sulfate. Hydrodynamics plays a major role in the performance of inhibitor. Out of the many techniques available, jet impingement is the one which mimics the industrial conditions and hence used in the current investigation. Potentiodynamic and electrochemical impedance techniques were employed for corrosion and inhibition studies. Experiment was conducted by varying the flow rate and temperature at an impingement angle of 90°. Surface study was done using SEM and variation in the morphology as a result of erosion corrosion and inhibition was discussed in detail. The results indicated that the erosion corrosion process is both charge transfer and diffusion controlled and the mechanism of erosion corrosion changed with change in the experimental conditions of temperature and velocity. The increase in the flowrate demonstrated an increased protection efficiency. Glucose amine sulfate inhibited the erosion corrosion with an efficiency of 54% for the addition of 750 ppm, for the flow rate of 4 lpm at the temperature of 313 K. Surface morphology studies clearly demonstrated the efficacy of glucose amine sulfate in controlling the erosion corrosion of 6061 aluminum alloy.