CAJ | 학술논문

采用电子扫描电镜(SEM)观察铝合金表面附着的细菌显微形貌，利用分光光度法和微生物平板计数法研究SRB细菌的生长规律，运用电化学工作站测试6063铝合金在海洋微生物SRB作用下的开路电位、阳极极化曲线、电化学阻抗谱(EIS)的变化规律，采用间歇式培养细菌方式进行自然腐蚀，研究铝合金的腐蚀率和微生物腐蚀后的形貌特征。结果表明：与无菌介质条件相比，海洋微生物在 SRB 作用下的铝合金开路电位负移，钝化性能变差，使得铝合金腐蚀率变大，腐蚀形式以点蚀为主；铝合金表面附着的海洋微生物以球状细菌为主；在海洋微生物 SRB 作用下，铝合金的交流阻抗模值减小，降低了铝合金的极化电阻和表面膜的电阻，从而加速了铝合金的腐蚀进程。
채용전자소묘전경(SEM)관찰려합금표면부착적세균현미형모，이용분광광도법화미생물평판계수법연구SRB세균적생장규률，운용전화학공작참측시6063려합금재해양미생물SRB작용하적개로전위、양겁겁화곡선、전화학조항보(EIS)적변화규률，채용간헐식배양세균방식진행자연부식，연구려합금적부식솔화미생물부식후적형모특정。결과표명：여무균개질조건상비，해양미생물재 SRB 작용하적려합금개로전위부이，둔화성능변차，사득려합금부식솔변대，부식형식이점식위주；려합금표면부착적해양미생물이구상세균위주；재해양미생물 SRB 작용하，려합금적교류조항모치감소，강저료려합금적겁화전조화표면막적전조，종이가속료려합금적부식진정。
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.