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Microstructural Development in a Laser-Remelted Al-Zn-Si-Mg Coating.

M Godec1, B Podgornik2, D Nolan3

  • 1Institute of Metals and Technology, Lepi pot 11, 1000, Ljubljana, Slovenia. matjaz.godec@imt.si.

Scientific Reports
|November 25, 2017
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Summary
This summary is machine-generated.

Laser surface treatment refines aluminum-zinc-magnesium-silicon coatings, enhancing microstructure and potentially improving corrosion resistance. This advanced technique offers a promising path for superior material performance.

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Metallurgy

Background:

  • Zn-Al galvanic coatings have undergone significant development over five decades.
  • Magnesium (Mg) addition has recently improved corrosion properties of these coatings.
  • Further enhancements are achievable through laser surface treatment.

Purpose of the Study:

  • To investigate the microstructure development of Al-Zn-Mg-Si coatings during laser remelting.
  • To analyze the effects of rapid cooling rates on the coating's microstructure.
  • To evaluate the potential for improved corrosion performance via laser modification.

Main Methods:

  • Remelting of Al-Zn-Mg-Si coating using a diode laser with a wide-beam format.
  • Rapid self-quenching due to extreme cooling rates.
  • Microstructure analysis using Electron Backscatter Diffraction (EBSD).

Main Results:

  • Laser remelting and rapid quenching resulted in a finer grain size.
  • The microstructure became refined and homogenized regarding phase distribution.
  • Despite some unavoidable porosity and intergranular cracking, mechanical properties like ductility remained unaffected.

Conclusions:

  • Laser surface treatment significantly refines the microstructure of Al-Zn-Mg-Si coatings.
  • The refined microstructure holds high potential for enhanced corrosion performance.
  • The developed laser technology offers a promising approach for advanced coating applications.