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通过对商用X80管线钢进行适当的Cu合金化功能性改进,制备出不同Cu含量(1.06Cu、1.46Cu、2.00Cu,质量分数,%)的新型管线钢。利用抗菌性能检测、电化学测试、腐蚀产物分析、激光共聚焦显微镜(CLSM)等方法研究了含Cu管线钢的抗菌性能和微生物腐蚀行为。研究表明,含Cu管线钢对大肠杆菌和金黄色葡萄球菌均具有强烈的杀灭作用,以多边形铁素体为特征的1.0Cu管线钢能够保证在X80钢强韧性的水平下具有优异的抗微生物腐蚀性能。含Cu管线钢中富Cu相对抗微生物腐蚀性能起到了关键作用。1.0Cu钢和X80钢的线性极化电阻RLPR在含有硫酸盐还原菌(SRB)的土壤浸出液中浸泡2 d后均急剧下降,导致X80钢的腐蚀电流密度明显大于1.0Cu钢。显微观察表明,大量生物膜的生成导致在SRB环境中的X80钢的点蚀数量和最大点蚀坑深度均高于1.0Cu钢。
Through the proper Cu alloy functionalization improvement on commercial X80 pipeline steel, new pipeline steel with different Cu contents (1.06Cu, 1.46Cu, 2.00Cu, mass fraction,%) was prepared. The antibacterial properties and microbial corrosion behavior of Cu-containing pipeline steel were studied by antibacterial test, electrochemical test, corrosion product analysis and laser confocal microscopy (CLSM). Studies have shown that Cu-containing pipeline steel has a strong killing effect on both Escherichia coli and Staphylococcus aureus. Polycrystalline ferritic 1.0Cu pipeline steel can ensure excellent antimicrobial activity at the level of X80 steel’s toughness Corrosion performance. Cu-rich Cu-containing steels play a key role in antimicrobial corrosion resistance. The linear polarization resistance RLPR of 1.0Cu steel and X80 steel decreased sharply after soaking in soil leachate containing SRB for 2 d, resulting in the corrosion current density of X80 steel being obviously larger than that of 1.0Cu steel. Microscopic observations showed that the formation of large numbers of biofilms resulted in higher pitting corrosion and pitting pit depth for X80 steel in SRB environment than 1.0Cu steel.