(1. 廣東工業(yè)大學 材料與能源學院，廣州 510006；
2. 廣東石油化工學院 化工與環(huán)境工程學院，茂名 525000；
3. 中國水產科學研究院 南海水產研究所，廣州 510300)
摘 要: 采用電子掃描電鏡(SEM)觀察鋁合金表面附著的細菌顯微形貌，利用分光光度法和微生物平板計數法研究SRB細菌的生長規(guī)律，運用電化學工作站測試6063鋁合金在海洋微生物SRB作用下的開路電位、陽極極化曲線、電化學阻抗譜(EIS)的變化規(guī)律，采用間歇式培養(yǎng)細菌方式進行自然腐蝕，研究鋁合金的腐蝕率和微生物腐蝕后的形貌特征。結果表明：與無菌介質條件相比，海洋微生物在SRB作用下的鋁合金開路電位負移，鈍化性能變差，使得鋁合金腐蝕率變大，腐蝕形式以點蝕為主；鋁合金表面附著的海洋微生物以球狀細菌為主；在海洋微生物SRB作用下，鋁合金的交流阻抗模值減小，降低了鋁合金的極化電阻和表面膜的電阻，從而加速了鋁合金的腐蝕進程。
關鍵字: 鋁合金；微生物腐蝕；電化學阻抗譜；咸淡水
（1. School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China;
2. College of Chemical and Environmental Engineering, Guangdong University of Petrochemical Technology,
Maoming 525000, China;
3. South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China）
Abstract:The microstructure of the bacteria that attached on the aluminum alloy surface was observed by scanning electron microscopy (SEM). The growth regularity of the SRB bacteria was measured by spectrophotometry and microbial plate count methods. The open-circuit potential, polarization curves and electrochemical impedance spectroscope (EIS) of aluminum alloy 6063 under the marine microbes SRB were studied by adopting electrochemical workstation. By using natural corrosion test, the corrosion rate and corrosion morphology of the alloy immersed in intermittent culture bacteria were analyzed. The results show that, compared with the sterile medium conditions the open-circuit potentials of the alloy shift negatively and the passivation performance worsen under the marine microbe SRB, which leads to larger corrosion tendency, higher corrosion rate, and pitting corrosion form. The marine microbes attached to the aluminum are mainly spherical bacteria. The AC impedance modulus of aluminum decreases under marine microbe SRB, thus, reducing the polarization resistance of aluminum alloy and resistance of surface film, and accelerating the process of corrosion of aluminum.
Key words: aluminum alloy; microbial corrosion; electrochemical impedance spectroscope; estuary water
