1：Experimental Design and Method Selection:

Graphene coatings with different layer numbers (mono-, bi-, tetra-, hex-, octal-layer) were grown on copper foil using a chemical vapor deposition (CVD) method, controlling parameters like temperature, gas composition, flow rate, and deposition time. The corrosion resistance was evaluated through electrochemical tests, salt spray tests, and scanning vibrating electrode technique (SVET) to study galvanic corrosion and protection failure mechanisms.

2：Sample Selection and Data Sources:

Copper foil substrates were used, with an uncoated heat-treated Cu foil as a reference. Samples were characterized using Raman spectroscopy, SEM, XPS, and optical microscopy to assess graphene quality, defect density, and corrosion morphology.

3：List of Experimental Equipment and Materials:

Equipment included a CVD system for graphene growth, Raman system (Alpha 300S, WITec), FESEM (Hitachi S-4800), XPS (Thermo Fisher K-Alpha), electrochemistry workstation (Modulab, Solartron), salt spray chamber (Q-FOG, Q-lab Corporation), and SVET system (AMETEK). Materials included copper foil, gases for CVD, and NaCl solutions for corrosion tests.

4：Experimental Procedures and Operational Workflow:

Graphene was synthesized via CVD, characterized by Raman and SEM. Electrochemical tests involved potentiodynamic polarization and EIS in 3.5 wt.% NaCl. Salt spray tests followed ASTM B117 in 5 wt.% NaCl. SVET measurements were performed with a vibrating microelectrode to map current density over corroded areas.

5：5 wt.% NaCl. Salt spray tests followed ASTM B117 in 5 wt.% NaCl. SVET measurements were performed with a vibrating microelectrode to map current density over corroded areas. Data Analysis Methods:

5. Data Analysis Methods: Raman data analyzed defect density via ID/IG ratios. Electrochemical data fitted to equivalent circuits for impedance. SVET data converted to current density using Ohm's law. Statistical analysis ensured reproducibility with multiple samples.