Electrochemical Investigation of Erosion-corrosion Behavior of 6061 Aluminum Alloy in Marine Environment

Abstract

The liquid-solid erosion-corrosion behavior of aluminum in artificial seawater medium at open circuit has been investigated using a submerged jet impingement rig. The aluminum alloy 6061 coupons subjected to erosion corrosion condition were placed normal to the impinging jet. The gap maintained between the nozzle and the specimen was 5mm. In the present study, sea sand was used as an erodent. Erosion corrosion rate was measured using potentiodynamic polarization and electrochemical impedance spectroscopy methods. At a flowrate of 4 lpm passivation was observed in the potentiodynamic polarization plot which was confirmed by the appearance of inductive loop in the Nyquist plot. At higher flowrates no such condition was observed. The system response to impedance studies was characterized by a high frequency capacitive loop and a capacitive loop at the lower frequency. Surface morphology was studied with scanning electron microscopy (semi quantitative analysis) and atomic force microscopy techniques. Elemental mapping was done with electron dispersive X-ray studies. The erosion-corrosion rate increased with increase in the flow rate and temperature. The results of this work will aid in the selection of material for controlled or reduced material loss in sea water circulating equipment' and pipelines.

Erosion‐Corrosion of Materials in Industrial Equipment: A Review

“…Oxygen availability (increased mass transfer of the cathodic reactant) increases with the flow rate enhancing the corrosion rate. Under dynamic situations, the corrosion products will be quickly scraped away from the surface by the flowing fluid accelerating the anodic reaction, thereby promoting the dissolution of the metal substrate [71] …”

“…Except for Glucose amine sulfate, Commiphora Mukul and starch showed a decrease in the inhibition efficiency with an increase in flowrate. Glucose amine sulfate increased the inhibition efficiency with flow rate [71 113] . Numerous organic compounds have also been successfully studied as extensive inhibitors for metal corrosion in sodium chloride.…”

Assessing the Effect of Boswellia Serrata Extract on Fouling of Alloy 6061 Aluminum in Artificial Seawater Slurry

“…The results clarify that a positive correlation between the temperature and the fouling deposition. The corrosion rate intensifies with an increase in the temperature [20,21]. The corrosion products deposit on the surface and increase the weight of the sample.…”

An Up-to-Date Review on Industrially Significant Inhibitors for Corrosion Control of Zinc

“…As a part of our research work on the studies of corrosion behavior and corrosion inhibition of nonferrous materials [22][23][24][25][26][27] under static and dynamic conditions [28], we report herein an up-to-date review on corrosion inhibition strategy for zinc under various corrosive mediums.…”