1：Experimental Design and Method Selection:

The study involved characterizing FEP and PTFE coatings on aluminum-magnesium substrates and using a continuous wave Nd:YAG laser for stripping. Parameters like power, scanning frequency, and advance speed were optimized through sensitivity tests.

2：Sample Selection and Data Sources:

Eighteen samples of EN AW 5251 aluminum-magnesium alloy (140 x 120 x

3：2 mm3) were prepared, with 8 coated in PTFE, 8 in FEP, and 2 uncoated for substrate study. Coatings were applied using Whitford Company products. List of Experimental Equipment and Materials:

Equipment included a Nd:YAG laser (Rofin-Baasel DY022), thickness measurement device (Fisher Dualscope MP0R), microhardness tester (Fischerscope H100), infrared spectrometers (Bruker FT-IR Tensor 27 and JASCO FT 4000), digital microscope (Leica DMV6), roughness tester (Mitutoyo Surftest SJ-201), tensile machine (Zwick Roell Z100), and oven (Nabertehem NA 15/65). Materials included aluminum substrates and fluoropolymer coatings.

4：5). Materials included aluminum substrates and fluoropolymer coatings. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: The process cycle involved degreasing, sandblasting, primer application, coating application, curing in an oven, laser stripping, and final cleaning. Laser parameters were varied to find optimal stripping conditions. Measurements of thickness, roughness, microhardness, contact angles, reflectance, and mechanical properties were conducted before and after stripping.

5：Data Analysis Methods:

Data were analyzed using standard methods (e.g., ISO standards for thickness and hardness), with results compared between FEP and PTFE coatings. Efficiency indicators like stripping rate and energy consumption were calculated.