Development of micro-nanostructured film with antibacterial, anticorrosive and thermal conductivity properties on copper surface

A micro-nano sharkskin like film (Cu-MNS-FA) was synthesized on copper surface through chemical etching followed by formate passivation, and its anticorrosive, antibacterial and thermal conductivity properties were investigated. Results show that after 7 d of exposure to nature, Pseudomonas aeruginosa and Desulfovibrio vulgaris seawater, the charge transfer resistance of Cu-MNS-FA is more than three times higher than that of unmodified copper. In particular, in D. vulgaris seawater, the R ct value of modified copper is 7 times higher than that of unmodified copper after the same exposure duration. The counts of sessile cells, specifically P. aeruginosa and D. vulgaris , on the surface of modified copper are reduced by more than 88 % after 3 days of immersion. Furthermore, thermal conductivity remains 10 % higher than that of untreated copper after 7 d of immersion. This film improves the performance characteristics of copper in seawater heat exchange systems.