A Repair Method for Damage in Aluminum Alloy Structures with the Cold Spray Process

Area of Science:

• Materials Science
• Surface Engineering
• Corrosion Science

Background:

• Aluminum alloy structures are susceptible to wear and corrosion, leading to significant financial and energy costs.
• Effective repair methods are crucial for extending the service life of damaged aluminum alloy components.

Purpose of the Study:

• To investigate the efficacy of the cold spray process for repairing damaged aluminum alloy structures.
• To evaluate the microstructural, mechanical, and corrosion properties of cold-spray-repaired aluminum alloy.

Main Methods:

• Utilized a cold spray process with a mixture of Aluminum (Al) and Aluminum Oxide (Al2O3) powders.
• Repaired a 7N01-T4 aluminum alloy plate with a simulated pit.
• Analyzed microstructure, microhardness, tensile strength, and corrosion behavior through alternate immersion tests.

Main Results:

• Repaired areas showed no visible pores or cracks, with microhardness ranging from 57.4-63.2 HV.
• Tensile strength of repaired samples was significantly improved compared to unrepaired samples.
• Repaired samples demonstrated superior corrosion resistance, exhibiting the lowest mass loss rate and forming dense corrosion products.

Conclusions:

• The cold spray process is a viable and effective method for repairing damaged aluminum alloy structures.
• Cold spray repair enhances mechanical properties and significantly improves corrosion resistance.
• This technique offers a promising solution to mitigate costs associated with aluminum alloy component failure.