| Along with the rapid development of the human society, the need for energy is increasing. However, the traditional energy is limited and scarce. Therefore, people pay more and more attentions to the enormous potential marine resources. As we know, ocean has a great value on economy and national defence, however, as a maritime nation with an area of 3.0 millions square kilometers maritime area and 32, 000 kilometres coastline, the marine industry of China is still very backward due to the corrosion problems of marine equipments. Due to the MIC (Microbiologically Influenced Corrosion), the direct and indirect loss has nearly occupied the 70～80% of marine material corrosion failures. Compared with the main developed countries, our country still has a long way to go.A good news was that the 13th five year plan has stressed that the development of a novel MIC resistance material would be an important part of the national marine development strategy.This study modified the usual 2205 duplex stainless steel (2205-DSS) to possess MIC resistance through adding proper amount of copper element, which would form ε-Cu phase in the steel matrix dispersedly after the proper heat treatment. The Cu-bearing 2205 DSS (2205-Cu DSS) would release Cu2+ which could kill bacteria after contact for certain time, and at the same time, it would inhibit the activity of biofilm. Therefore,2205-Cu DSS possessed the ability of MIC resistance.It was found that 2205-Cu DSS remained excellent mechanical properties after solid solution treatment and aging treatment. At the same time,2216E liquid medium was selected as the simulated liquid of the marine environment for the cultivation of Pseudomonas Aeruginosa (P. aeruginosa).This study compared the different corrosion behaviors of 2205 DSS with and without Cu addition through electrochemical experiments (Eocp, LPR, EIS and CP), SEM, CLSM, Live/Dead and XPS analyses, which confirmed that 2205-Cu DSS had a better MIC resistance in the presence of P. aeruginosa. |
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