D-氨基酸增强型杀菌剂对三种金属材料腐蚀行为的影响  

Effect of D-amino Acid Enhanced Bactericide on Corrosion Behavior of Three Metal Materials

作　　者：胥聪敏[1] 李雪丽 朱文胜 朱世东[1] 杨兴 高豪然 孙姝雯 XU Congmin;LI Xueli;ZHU Wensheng;ZHU Shidong;YANG Xing;GAO Haoran;SUN Shuwen(School of Materials Science and Engineering,Xi’an Shiyou University,Xi’an 710065,China;CNOOC Changzhou Paint and Coating Industry Research Institute Co.,Ltd.,Suzhou 213000,Jiangsu,China)

机构地区：[1]西安石油大学材料科学与工程学院,西安710065 [2]中海油常州涂料化工研究院有限公司,江苏苏州213000

出　　处：《材料导报》2024年第20期205-210,共6页Materials Reports

基　　金：国家自然科学基金(51974245,21808182);陕西省重点研发计划资助项目(2020GY-234);西安石油大学材料科学与工程学院,西安市高性能油气田材料重点实验室,西安石油大学“材料科学与工程”省级优势学科资助项目(YS37020203);西安石油大学研究生创新与实践能力培养项目(YCS22213138)。

摘　　要：采用生物培养技术、杀菌过程评价、失重实验、电化学测试、表面分析等测试手段,研究了D-氨基酸增强型杀菌剂对45#碳钢、316L不锈钢和H62黄铜在硫酸盐还原菌(SRB)+铁氧化菌(IOB)混合菌中的耐蚀行为及机理的影响。结果表明,无杀菌剂时三种金属的年腐蚀深度排序为45#碳钢(0.1042 mm/a)>H62黄铜(0.0456 mm/a)>316L不锈钢(0.0073 mm/a)。混合菌中的SRB和IOB具有协同作用,进而加速了金属材料腐蚀。加入杀菌剂后,混合菌中SRB和IOB的杀菌率分别超过了99%和90%,三种金属的极化曲线均向左移,i_(corr)均有不同程度的下降,腐蚀速率均显著降低,且点蚀坑的深度和数量明显减少;微生物代谢产物中的P、S含量显著减少,说明活菌数量急剧降低。无论有/无杀菌剂条件下,316L不锈钢因表面易生成氧化铬钝化膜而使其耐蚀性能最好,H62黄铜因Cu^(2+)有杀菌作用而使其耐蚀性较好。杀菌剂中的四羟甲基硫酸磷(THPS)可改变细胞酶和蛋白质的性质,导致细菌死亡,且D-氨基酸可分解金属表面的生物膜,使细菌由难杀灭的固着态转变为易杀灭的浮游态,提高了杀菌效果,同时避免了高浓度的胞外聚合物(EPS)形成,从而降低了金属的腐蚀速率。The effects of D-amino acid enhanced compound bactericide on corrosion resistance behavior and mechanism of 45#carbon steel,316L stainless steel and H62 brass in sulfate reducing bacteria(SRB)+iron oxidizing bacteria(IOB)were studied by biological culture technology,bactericidal process evaluation,weight loss experiment,electrochemical test and surface analysis.The results showed that the corrosion depth of different metals a year without bactericide was as follows,45#carbon steel(0.1042 mm/a)>H62 brass(0.0456 mm/a)>316L stainless steel(0.0073 mm/a).Because the SRB and IOB in the mixed bacteria have a synergistic effect to accelerate the corrosion of metal mate-rials.After adding the bactericide,the bactericidal rate of SRB and IOB in the mixed bacteria exceeded 99%and 90%,respectively,the polarization curves of the three metals all shifted to the left,the i_(corr)decreased in a varying degree,the corrosion rate reduced significantly,and the depth and number of pitting pits decreased significantly.Moreover,the content of P and S in microbial metabolites decreased significantly,it indicated that the number of viable bacteria decreased sharply.With or without bactericide,316L stainless steel has the best corrosion resistance due to the easy formation of chromium oxide passivation film on the surface,and H62 brass has good corrosion resistance due to Cu^(2+)bactericidal effect.The tetrakis hydroxymethyl phosphonium sulphate(THPS)in the compound bactericide can change the properties of cellular enzymes and proteins to cause the death of bacteria,meanwhile D-amino acids can decompose the biofilm on the surface of the metal,which can change the bacteria from the hard-to-kill fixed state to the easy-to-kill floating state to improve the bactericidal effect,and also avoid the formation of high concentrations of extracellular polymer EPS,thereby reduce the corrosion rate of the metal.

关 键 词：D-氨基酸 杀菌剂 混合菌 生物膜 金属耐蚀性 

分 类 号：TG172.4[金属学及工艺—金属表面处理]