Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: Effect of biofilms on corrosion behavior of 5083 Al-alloy (5083AA) in natural seawater was investigated by means of epifluorescence microscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy as well as measurements of open circuit potential, electrochemical impedance spectroscopy and pothentiodynamic polarization curves. Results showed that biofilms could form on the surface of 5083AA in natural seawater and acted as a protective layer for the substrate; moreover, in comparison with those in sterile seawater, the open circuit potential of the alloy was lower and the electron charge resistance (Rct) of the alloy was higher in natural seawater, which may be related with the reduction of cathodic reaction and microbiological corrosion inhibition on the alloy surface respectively. The microbiological corrosion inhibition may be due to the oxygen consumption by bacteria respiration and the existence of protective biofilms. On the other hand, the corrosion of 5083AA alloy could be inhibited in sterile medium to a certain extant, and this may be due to the formation of corrosion products on the alloy surface.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: Microbiologically influenced corrosion (MIC) is an important corrosion form in marine environment. The development of novel technology for MIC inhibitionis of great significance for the utilization of marine source. In this research, a three-step procedure, including electrochemical etching, surface modification, and infusion of lubricant, was utilized to fabricate slippery liquid-infused porous surface (SLIPS) over Al. The effect of SLIPS on the adherence of sulfate reducing bacteria (SRB) and the SRB induced corrosion was studied. It was found that the SLIPS can inhibit the SRB adherence for the liquid- like property of SLIPS, which hardly provides anchors for the SRB adherence. Furthermore, the lubricant layer existed over aluminum substrate can inhibit the penetration of corrosive medium, and thus provide an effective barrier between corrosive medium and Al-substrate. The as- fabricated SLIPS can maintain high stability in both static and dynamic seawater with SRB. This research will provide a sound reference for developing a novel method for MIC protection.