Distinctive colonization of Bacillus sp. bacteria and the influence of the bacterial biofilm on electrochemical behaviors of aluminum coatings.
Formation of biofilm is usually essential for the development of biofouling and crucially impacts the corrosion of marine structures. Here we report the attachment behaviors of Bacillus sp. bacteria and subsequent formation of bacterial biofilm on stainless steel and thermal sprayed aluminum coatings in artificial seawater. The colonized bacteria accelerate the corrosion of the steel plates, and markedly enhance the anti-corrosion performances of the Al coatings in early growth stage of the bacterial biofilm. After 7days incubation, the biofilm formed on the steel is heterogeneous while exhibits homogeneous feature on the Al coating. Atomic force microscopy examination discloses inception of formation of local pitting on steel plates associated with significantly roughened surface. Electrochemical testing suggests that the impact of the bacterial biofilm on the corrosion behaviors of marine structures is not decided by the biofilm alone, it is instead attributed to synergistic influence by both the biofilm and physicochemical characteristics of the substratum materials.
Key Laboratory of Marine Materials and Related Technologies, Key Laboratory of Marine Materials and Protective Technologies of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
Leila
L
Abdoli
Key Laboratory of Marine Materials and Related Technologies, Key Laboratory of Marine Materials and Protective Technologies of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
Xinkun
X
Suo
Key Laboratory of Marine Materials and Related Technologies, Key Laboratory of Marine Materials and Protective Technologies of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China. Electronic address: lihua@nimte.ac.cn.
Hua
H
Li
D000535:Aluminum / Q000494:pharmacology*; D001407:Bacillus / Q000187:drug effects / Q000254:growth & development / Q000502:physiology* / Q000648:ultrastructure; D018441:Biofilms / Q000187:drug effects / Q000254:growth & development*; D020099:Coated Materials, Biocompatible / Q000494:pharmacology*; D015169:Colony Count, Microbial; D058266:Dielectric Spectroscopy; D004563:Electrochemistry / Q000379:methods*; D018625:Microscopy, Atomic Force; D017550:Spectroscopy, Fourier Transform Infrared; D013193:Stainless Steel / Q000494:pharmacology
D020099:Coated Materials, Biocompatible; D013193:Stainless Steel; D000535:Aluminum
Aluminum; Bacteria; Biofilm; Electrochemical testing; Microbial corrosion; Microscopy