Li-Jun He,Zheng-Hui Qiu,Shao-Xia Ma,Rong-Chang Zeng,Cun-Guo Lin
This work investigated the effect of Desulfovibrio caledoniensis (D. caledoniensis) and Pseudomonas aeruginosa (P. aeruginosa) on the microbiologically influenced corrosion (MIC) behaviour of 70Cu-30Ni alloy using surface analysis and electrochemical techniques. The results demonstrated that the mixed medium containing D. caledoniensis and P. aeruginosa further accelerated the MIC of 70Cu-30Ni alloy compared to the single species medium. The addition of exogenous pyocyanin (PYO) to the D. caledoniensis medium increased the maximum pit depth on 70Cu-30Ni alloy from 5.40 μm to 6.59 μm, and the corrosion current density (icorr) increased by one order of magnitude. From the perspective of bioenergetics and extracellular electron transfer (EET), the comprehensive MIC mechanism of 70Cu-30Ni alloy induced by D. caledoniensis and P. aeruginosa was proposed.
To mitigate the microbiologically influenced corrosion (MIC) of 70Cu-30Ni alloy induced by sulfate-reducing bacteria (SRB), a novel and intelligent antibacterial coating with controlled release properties was developed. The coating was constructed by incorporating S 2- -responsive nanocontainers into the epoxy coating. The nanocontainers were prepared by filling the hollow mesoporous silica nanoparticles (HMSNs) with triclosan (TCS), which served as an antibacterial agent, and the subsequent deposition of ZIF-7, acting as the S 2- -responsive gatekeeper. The synthesized nanocontainers were characterized using various techniques, including SEM, TEM, FT-IR, XRD, and XPS. Antibacterial tests against SRB were conducted to assess the antibacterial effect of nanocontainers. UV–vis experiments demonstrated that TCS could be triggered to release from the HMSNs-TCS@ZIF-7 nanocontainers in response to the attack of S 2- . The sustained release of TCS effectively inhibited the SRB adhesion and the released benzimidazole by the decomposition of ZIF-7 acted as corrosion inhibitors, thereby preventing SRB-induced MIC. This study would contribute to the development and design of intelligent responsive coatings with long-term MIC inhibition capabilities.
危险品化学品经营许可证（带存储）