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Effect of micro arc oxidation on micro – structure and electrochemical corrosion performance of cold sprayed aluminum coating
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Purpose
To improve the electrochemical corrosion resistance of cold sprayed Al coating.
Design/methodology/approach
A cold sprayed aluminum (Al) coating fabricated on S355 structural steel was oxidized using a micro arc oxidation (MAO). The electrochemical corrosion and impedance spectroscopy were tested to investigate its corrosion performance.
Findings
The MAO film is primarily α-Al2O3 and γ-Al2O3, which increases its density and surface quality. The corrosion potential is positively shifted by 0.2 V, and the electrochemical impedance is significantly increased.
Originality/value
A cold sprayed Al coating on S355 steel was first oxidized using a MAO. The effects of MAO on the microstructure of Al coating were investigated to analyze its electrochemical corrosion behavior.
Title: Effect of micro arc oxidation on micro – structure and electrochemical corrosion performance of cold sprayed aluminum coating
Description:
Purpose
To improve the electrochemical corrosion resistance of cold sprayed Al coating.
Design/methodology/approach
A cold sprayed aluminum (Al) coating fabricated on S355 structural steel was oxidized using a micro arc oxidation (MAO).
The electrochemical corrosion and impedance spectroscopy were tested to investigate its corrosion performance.
Findings
The MAO film is primarily α-Al2O3 and γ-Al2O3, which increases its density and surface quality.
The corrosion potential is positively shifted by 0.
2 V, and the electrochemical impedance is significantly increased.
Originality/value
A cold sprayed Al coating on S355 steel was first oxidized using a MAO.
The effects of MAO on the microstructure of Al coating were investigated to analyze its electrochemical corrosion behavior.
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Abstract:
Micro-arc oxidation (MAO) is a new surface treatment technology that can improve
wear resistance, corrosion resistance, high voltage insulation, and other metal propertie...