Development of an Oxide Layer on Al 6061 Using Plasma Arc Electrolytic Oxidation in Silicate-Based Electrolyte

Area of Science:

• Materials Science
• Surface Engineering
• Electrochemistry

Background:

• Plasma electrolytic oxidation (PEO) is a surface treatment technique for forming oxide layers.
• The electrolyte composition significantly impacts surface properties like wear and corrosion resistance.
• Nanoparticle incorporation can further enhance surface characteristics.

Purpose of the Study:

• To investigate the plasma electrolytic technique for oxide layer formation on Al 6061 alloy.
• To analyze the influence of direct current (DC) voltage and electrode distance on oxide layer properties.
• To evaluate the changes in elemental composition of the substrate surface.

Main Methods:

• Utilized a plasma electrolytic technique with DC voltage on a silicate-based electrolyte.
• Employed Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) for surface analysis.
• Performed Energy Dispersive X-ray Analysis (EDAX) to determine elemental composition changes.

Main Results:

• Confirmed the formation of a substantial oxide layer on the Al 6061 alloy surface.
• Observed significant changes in the weight percentage of elements (C, Al, Si, O) after treatment.
• Identified optimal process parameters, specifically 197 V and a current range of 0.3 A to 1 A, for significant elemental modification.

Conclusions:

• The plasma electrolytic method effectively forms oxide layers on Al 6061 alloy.
• Process parameters like voltage and current significantly influence surface elemental composition.
• This technique shows potential for improving the mechanical properties of aluminum alloys.