Synergistic interactions of MMTZ and carboxylic acid polymers: Enhancing the corrosion and oxidation resistance of electrolytic copper foil
The widespread use of electrolytic copper (EC) foil in lithium-ion batteries and printed circuit boards makes its corrosion and oxidation resistance critical to performance and durability. However, the protective performance of single corrosion inhibitors is limited, highlighting the urgent need for high-performance composite corrosion inhibitors. Herein, we systematically investigate the synergistic effects of 5-mercapto-1-methyl-1H-tetrazole (MMTZ) and carboxylic acid polymers (polyacrylic acid (PAA), hydrolyzed poly maleic anhydride (HPMA), and maleic acid-acrylic acid copolymer (MAAA)) in enhancing the corrosion resistance and antioxidant performance of EC foil. Compared to single corrosion inhibitors, composite inhibitors significantly improve the corrosion resistance and antioxidant performance of EC foil. When used individually, the corrosion inhibition efficiency of MMTZ and MAAA is only 83.99 % and 44.76 %, respectively, while the corrosion inhibition efficiency of the MMTZ-MAAA composite system reaches 96.95 %, and it can still significantly delay the oxidation discoloration of EC foil at 200°C. The XPS and molecular dynamics simulation results further confirm the synergistic effect between the carboxylic acid inhibitors and MMTZ. Specifically, these components interact to form a stable and compact protective barrier on the EC foil surface through spatially complementary interactions. This work offers theoretical insights and new directions for designing high-performance composite corrosion inhibitors for EC foil.
危险品化学品经营许可证（带存储）