目的：研究罗伊氏乳杆菌胞外聚合物对碳钢腐蚀的抑制作用。方法采用腐蚀失重、X射线衍射( XRD)、扫描电镜( SEM)等检测手段，研究浸涂罗伊氏乳杆菌胞外聚合物后碳钢腐蚀速率、界面腐蚀产物以及腐蚀形貌结构的变化。结果罗伊氏乳杆菌胞外聚合物对碳钢腐蚀具有抑制作用，可以使平均腐蚀速率降低25.60%；浸涂罗伊氏乳杆菌胞外聚合物后，碳钢界面的腐蚀产物种类没有变化，但两者在磁铁矿、磁赤铁矿与纤铁矿的比例上存在显著差异；浸涂工况下，前9天磁铁矿、磁赤铁矿与纤铁矿的质量百分数之比为1.0：1.0：1.1；浸涂后，界面腐蚀产物与碳钢表面结合牢固，不易脱落。结论在碳钢界面浸涂罗伊氏乳杆菌胞外聚合物可以有效抑制腐蚀；罗伊氏乳杆菌胞外聚合物对碳钢界面晶体间转化关系以及腐蚀产物稳定性的改变，是碳钢腐蚀速率下降的主要原因。
ABSTRACT:Objective To explore new environment-friendly metal surface protection measures, corrosion inhibition of carbon steel by extracellular polymeric substances ( EPS) of Lactobacillus reuteri was researched. Methods By corrosion weight loss meth-od, X-ray diffraction ( XRD) and scanning electron microscope ( SEM) , the corrosion rates, corrosion products and interface mor-phology structure of carbon steel coupons with or without dip-coated EPS of Lactobacillus reuteri were analyzed. Results EPS of Lactobacillus reuteri reduced the average corrosion rate of carbon steel by 25. 60%. No matter with or without EPS, both coupons had the same types of corrosion products. However, the proportions of magnetite, maghemite and lepidocrocite were significantly different. On the first nine days, the magnetite/ maghemite/ lepidocrocite percentage ratio on the coupons with EPS remained 1. 0 :1. 0 : 1. 1. In addition, compared to coupons without EPS, the corrosion products bound to the carbon steel surface more firmly, and less rarely fell off. Conclusion Coating of carbon steel surface with EPS of Lactobacillus reuteri could effectively inhibit corro-sion;the impacts of EPS of Lactobacillus reuteri on the crystal transformation and the stability of the corrosion products of carbon steel were the main reasons for inhibition of carbon steel corrosion.
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