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切削液的微生物劣化对碳钢耐腐蚀行为的影响
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国家重点研发计划项目(2016YFB0300702);上海海事大学研究生创新基金项目(2017ycx003);上海市军民融合发展专项(2019-jmrh1-kj45)


Microbial Degradation of Cutting Fluid and Its Effect on Anticorrosion Behavior of Carbon Steel
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    摘要:

    利用平板划线法对切削废液中的微生物进行提纯分离及鉴定,分离出一种假单胞菌属P.xiamenensis种的优势菌种,将菌种接种至切削液中进行微生物劣化,并研究在含菌切削液中45钢的腐蚀行为。实验结果显示:该菌种在切削液中的数量级在106 CFU/mL以上;该菌能优先降解切削液中含氮表面活性剂,增加乳化液液滴的粒径,从而增加切削液的浊度;45钢在含菌切削液中浸泡15天后,表面出现了一层稀松多孔的生物膜,将生物膜去除后发现基体发生了严重的点蚀现象。极化曲线结果显示,碳钢在含菌切削液中的腐蚀电流密度是空白对照样的2.2倍。电化学阻抗结果显示,浸泡时间增长电荷转移电阻逐渐下降,耐蚀性变差,第5天出现了生物膜,且生物膜的厚度不断增加,基体在生物膜下发生严重的点蚀。

    Abstract:

    A dominant Pseudomonas sp.strain (P.xiamenensis) was isolated from a waste metal cutting fluid by streak plate method.The biodegradation of metal cutting fluid (MCF) and corrosion behavior of 45 carbon steel in MCF influenced by P.xiamenensis were studied.Results show that P.xiamenensis can easily colonize in MCF without biocide and maintain its biomass beyond 106 CFU/mL.Nitrogenous surfactants are preferentially degraded by bacteria leading to the increasing of oilinwater emulsion droplet and turbidity of MCF.A porous biofilm occurrs on the surface 45 carbon steel after 15 days immersion in MCF,and serious pitting corrosion is found when the biofilm is removed.Polarization curve results indicate that the corrosion rate of 45 steel in the biocontaminated MCF is 2.2 times than in controlled MCF.The electron transfer resistance of 45 carbon steel presents a gradual decreasing tendency in the MCF under the influence of P.xiamenensis,which results in weakening of anticorrosion of the steel.The biofilm appeares on the steel surface when immersed for 5 days and the thickness of biofilm is thickened with the extension of immersion time.Severely pitting corrosion attacks the substrate under the biofilm.

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李庆宏,杨 懿,吴泽奇,朱红玲,申媛媛,张 丽,胡 浩,董丽华.切削液的微生物劣化对碳钢耐腐蚀行为的影响[J].润滑与密封,2020,45(10):14-21.
LI Qinghong, YANG Yi, WU Zeqi, ZHU Hongling, SHEN Yuanyuan, ZHANG Li, HU Hao, DONG Lihua. Microbial Degradation of Cutting Fluid and Its Effect on Anticorrosion Behavior of Carbon Steel[J]. Lubrication Engineering,2020,45(10):14-21.

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  • 在线发布日期: 2020-10-15
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