研究目的
To systematically reveal the effects of laser shock peening (LSP) on the electrochemical corrosion behaviour of Mg-Al-Mn alloy subjected to massive LSP treatment, particularly focusing on the influence of coverage layer and Cl- concentration.
研究成果
Massive LSP treatment improves electrochemical corrosion resistance of Mg-Al-Mn alloy, with greater improvement at higher coverage layers. The enhancement is due to grain refinement and compressive residual stress. Even in high Cl- concentrations, LSP provides some protection, though less effectively. The mechanisms involve reduced corrosion rates and delayed crack propagation.
研究不足
The improvement in corrosion resistance is less significant in higher Cl- concentrations (e.g., 2.392 mol/L NaCl). The study is limited to Mg-Al-Mn alloy and specific LSP parameters; generalizability to other materials or conditions may be constrained.
1：Experimental Design and Method Selection:
The study used potentiodynamic polarisation tests, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM) to investigate corrosion behaviour. Microstructural characterization was done using optical microscopy and transmission electron microscopy (TEM).
2：Sample Selection and Data Sources:
Commercial die-cast Mg-Al-Mn alloy (AM50) specimens were used, machined and polished.
3：List of Experimental Equipment and Materials:
A Q-switched Nd:YAG laser for LSP, GAMRY 600 Electrochemical Testing System, CHI660 electrochemical workstation, JSM-7001M SEM, JEM-2100 TEM, and various NaCl solutions.
4：Experimental Procedures and Operational Workflow:
Specimens were treated with LSP at different coverage layers, then subjected to electrochemical tests in NaCl solutions at various concentrations and immersion times. Microstructural observations followed.
5：Data Analysis Methods:
Data from polarisation curves and EIS were analyzed using Tafel extrapolation and equivalent circuit fitting with ZSimpWin software.
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