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Effect of Current Density Ramping on the Growth Rate and Structure of AA2024-T3
Peter Totaro1,2, Boris Khusid1
1Otto H. York Department of Chemical and Materials Engineering, New Jersey Institute of Technology, University Heights, Newark, NJ 07102, USA.
Materials (Basel, Switzerland)
|May 20, 2022
Summary
Multistep anodization of aluminum alloy AA2024-T3 offers significant advantages. Specifically, five-step processes (MS1, MS2) yield more intact, less porous coatings with improved hardness and abrasion resistance.
Area of Science:
- Materials Science
- Surface Engineering
- Electrochemistry
Background:
- AA2024-T3 is a high-strength aluminum alloy widely used in aerospace.
- Anodization is a crucial surface treatment for enhancing corrosion and wear resistance.
- Optimizing anodization processes is key to improving coating properties.
Purpose of the Study:
- To investigate the effects of multistep anodization on AA2024-T3 coating properties.
- To compare conventional and multistep anodization techniques.
- To identify optimal parameters for enhanced coating performance.
Main Methods:
- Five distinct anodization processes were evaluated: one conventional (Base) and four multistep (OS1, OS2, MS1, MS2).
- Current density was applied in one or five steps during the ramp period at varying magnitudes.
- Coating morphology, porosity, hardness, and abrasion resistance were analyzed.
Main Results:
- Multistep processes MS1 and MS2, with lower oxygen infusion, resulted in more intact coatings.
- These processes exhibited reduced porosity compared to conventional methods.
- Enhanced abrasion resistance and hardness were observed in coatings from MS1 and MS2 processes.
Conclusions:
- Multistep anodization, particularly starting at low voltage and slowly ramping current density, improves coating integrity.
- This method leads to a higher aluminum/oxygen ratio and superior coating properties.
- Optimized multistep anodization offers a faster route to enhanced AA2024-T3 surface properties.
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