Wang Yu, Wu Jiajia, Zhang Dun, Li Ee, Zhu Liyang
Key Laboratory of Marine Environmental Corrosion and Biofouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Open Studio for Marine Corrosion and Protection, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Key Laboratory of Marine Environmental Corrosion and Biofouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Open Studio for Marine Corrosion and Protection, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China.
Bioelectrochemistry. 2021 Oct;141:107884. doi: 10.1016/j.bioelechem.2021.107884. Epub 2021 Jul 6.
Halomonas titanicae accelerated steel corrosion by dissimilatory Fe(III) reduction under anaerobic environments, and their adhesion was the key to achieving extracellular electron transfer between cells and Fe(III). This work investigated the inhibition effects of Cu and Ni alloying elements on corrosion of high strength low alloy (HSLA) steel affected by H. titanicae. It was found that both the addition of Cu (1.3%) and high content of Ni (7.2%) brought better corrosion resistance than the steel containing 4.8% Ni via decreasing the amount of sessile bacterial cells. And the inhibition efficiency of Cu with the lower content was stronger than that of Ni with the higher content. Biofilm inhibition mechanisms varied from Cu to Ni alloying elements, and the former was achieved via bactericidal Cu ions released from steel. While for the HSLA steel with high Ni content, the formation of nickel oxides including NiFeO and Ni(OH) refined the grains of corrosion products and decreased the bacterial attachment.
嗜钛嗜盐菌在厌氧环境下通过异化铁（III）还原作用加速钢铁腐蚀，其黏附是实现细胞与铁（III）之间胞外电子转移的关键。本研究调查了铜和镍合金元素对嗜钛嗜盐菌影响下的高强度低合金（HSLA）钢腐蚀的抑制作用。研究发现，添加铜（1.3%）和高含量镍（7.2%）均通过减少固着细菌细胞数量，比含4.8%镍的钢具有更好的耐腐蚀性。且较低含量的铜的抑制效率强于较高含量的镍。生物膜抑制机制因铜和镍合金元素而异，前者是通过钢释放的杀菌铜离子实现的。而对于高镍含量的HSLA钢，包括NiFeO和Ni(OH)在内的镍氧化物的形成细化了腐蚀产物的晶粒并减少了细菌附着。
