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Effect of multilayer CrN/CrAlN coating on the corrosion and contact resistance behavior of 316l ss bipolar plate for high temperature proton exchange membrane fuel cell

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Journal of Materials Science & Technology 2022年第2期97卷 134-146页

作者： S.Pugal Mani P.Agilan M.Kalaiarasan K.Ravichandran N.Rajendran Y.Meng Department of Analytical Chemistry University of MadrasChennai-25India Department of Chemistry Anna UniversityChennai-25India State Key laboratory of Tribology Tsinghua UniversityBeijing 100084China

Stainless steels have received wide attention as a substitute material for bipolar plates in high temperature proton exchange membrane fuel cell(HT-PEMFC).In the present work,the CrN,CrAlN and multilayer CrN/CrAlN coatings were deposited on 316 l ss to increase the corrosion resistance and decrease the interfacial contact *** deposited coatings exhibited face centered cubic phase structure and it was verified from the X-ray diffraction pattern.X-ray photo electron spectroscopy results showed the formation of both CrN and CrAlN layers on 316 l ***/CrAlN coating is more helpful in water management due to low surface roughness and high contact angle in the HT-PEMFC *** corrosion resistance behavior of all the samples were studied in 85%H_(3)PO_(4)solution at 140℃purged with H_(2)(HT-PEMFC anode)and O_(2)(HT-PEMFC cathode)*** results showed that all the coatings considerably improved the performance of 316 l ss and superior corrosion resistance was observed for CrN/CrAlN multilayer coating,whose protective efficiency was 98.12%and 96.14%in the two simulated HT-PEMFC *** results of electrochemical impedance spectroscopic studies demonstrated higher impedance for CrN/CrAlN *** morphological studies performed after corrosion studies revealed that protection ability of CrN/CrAlN coating still remained acceptable.A very low interfacial contact resistance value of 6 mΩ cm^(2) at 140 N/cm;was observed for CrN/CrAlN ***,after corrosion studies,the interfacial contact resistance value of CrN/CrAlN coated 316 l was much lower than that of CrN and CrAlN coatings due to the increased oxidation *** maximum power density of about 0.93 W/cm^(2) at 2 A/cm^(2) and output voltage of 0.96 V was observed for CrN/CrAlN coating.

关键词： Bipolar plate 316l ss Corrosion Contact resistance Contact angle Surface roughness

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海水淡化装置中TA2/HAl77-2/316l ss腐蚀体系微区电化学行为和机理研究

海水淡化装置中TA2/HAl77-2/316L SS腐蚀体系微区电化学行为和机...

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作者：丁莉中国石油大学(华东)

学位级别：硕士

由于工艺性能和结构性能的需求,低温多效蒸馏海水淡化装置中广泛存在TA2、HAl77-2、316l ss以及其他金属材料的耦合,处于海水工况下不可避免要发生多金属电偶腐蚀,从而会诱发点蚀、氢脆、应力腐蚀等局部腐蚀,威胁装置的安全运行。但是... 详细信息

由于工艺性能和结构性能的需求,低温多效蒸馏海水淡化装置中广泛存在TA2、HAl77-2、316l ss以及其他金属材料的耦合,处于海水工况下不可避免要发生多金属电偶腐蚀,从而会诱发点蚀、氢脆、应力腐蚀等局部腐蚀,威胁装置的安全运行。但是目前国内外对多金属电偶腐蚀的报道却很少。因此,展开对海水淡化装置中TA2/HAl77-2/316l ss耦合体系腐蚀行为的研究具有一定的现实意义。本文采用传统电化学技术(动电位扫描曲线和电化学阻抗谱)研究了TA2、HAl77-2和316l ss的腐蚀电化学行为受Cl浓度和温度的影响规律。由于传统电化学技术难以表征多金属电偶腐蚀界面处的不均匀腐蚀信息,本文采用先进的微区电化学技术(丝束电极和局部电化学阻抗谱)来研究TA2/HAl77-2/316l ss三金属耦合体系的电偶腐蚀行为受Cl浓度、温度和相对位置的影响规律。结果表明:(1)随Cl浓度的增加,HAl77-2和316l ss的腐蚀速率先增大后减小;随着溶液温度的升高,HAl77-2和316l ss的腐蚀逐渐加剧。随着Cl浓度的增加,TA2腐蚀速率逐渐增大;随着温度的不断升高,TA2在海水中的腐蚀速率先减小后增大。(2)在三金属耦合体系中,HAl77-2始终作阳极,TA2始终作阴极,绝大多数的316l ss表现为阴极,少数316l ss为阳极。随着Cl浓度的增加,阳极腐蚀速率先增加又减小;随着温度的升高,阳极腐蚀速率一直增加。当HAl77-2位于电极的中间位置时,由于电流传递容易进行,阳极腐蚀最严重。而且,位于两金属界面处的阳极电流明显高于远离界面处的,所以,界面处的阳极腐蚀比非界面处的严重。阳极HAl77-2的腐蚀呈现出明显的不均匀性,其表面的阻抗分布非常不均匀,阳极金属表面发生了明显的局部腐蚀。

关键词： HAl77-2 316l ss TA2 电偶腐蚀丝束电极局部电化学阻抗谱

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海水动态液膜环境下流速对316l ss/HA177-2电偶腐蚀行为的影响

海水动态液膜环境下流速对316L SS/HA177-2电偶腐蚀行为的影响

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第十二届全国腐蚀与防护大会

作者：贾绪鹏鞠虹李函芷中国石油大学(华东)材料科学与工程学院

随着水资源紧缺问题开始突显,海水淡化成为沿海缺水地区解决水源短缺问题的重要选择。低温多效蒸馏海水淡化装置中常用材料有316l不锈钢(316lss)和铝黄铜(HA177-2)等金属,两种金属在海水下形成电连接,不可避免的会发生电偶腐蚀。然而国... 详细信息

随着水资源紧缺问题开始突显,海水淡化成为沿海缺水地区解决水源短缺问题的重要选择。低温多效蒸馏海水淡化装置中常用材料有316l不锈钢(316lss)和铝黄铜(HA177-2)等金属,两种金属在海水下形成电连接,不可避免的会发生电偶腐蚀。然而国内外对动态海水液膜环境中电偶腐蚀的研究较少,因此研究电偶体系在海水液膜环境下的腐蚀行为及机理具有重要意义。本文自制双金属耦合的微电极阵列WBE:HAl77-2/316l ss,利用实验室自主搭建的微电极阵列腐蚀测试系统结合电化学阻抗谱技术研究不同海水流速下(1.5μm/min,2.5μm/min,5μm/min,10μm/min,20μm/min)HAl77-2/316l ss耦合体系的电偶腐蚀行为。结果表明,在HAl77-2/316l ss电偶体系中,HA177-2为阳极,绝大多数316l ss电极丝表现为阴极,在两种金属接触的附近处,阳极电流峰较大且比较集中,局部腐蚀严重。在动态液膜环境下,随着流速的增大,两种金属容抗弧均变小,金属界面处的电荷转移电阻变小,最大电位差?Emax和最大阳极电流密度I整体呈增大趋势,局部腐蚀强度因子lCⅡ逐渐增大,阴阳极面积比Sc/Sa始终大于1,明显呈大阴极小阳极分布,导致局部腐蚀的倾向变大。

关键词： HA177-2 316l ss 动态液膜流速电偶腐蚀

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Photoelectrochemical cathodic protection of Cu2O/TiO2 p-n heterojunction under visible light

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Journal of Oceanology and limnology 2020年第5期38卷 1517-1531页

作者： TIAN Jing CHEN Zhuoyuan JING Jiangping FENG Chang SUN Mengmeng lI Weibing Key laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China School of Environment and Safety Engineering Qingdao University of Science and TechnologyQingdao 266042China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China

The Cu2O/TiO2 p-n heterojunction composite photoelectrodes were prepared by depositing Cu 2 O nanoparticles on the surface of TiO 2 nanotubes via anodic oxidation and constant current *** emission scanning electron microscopy(SEM)and high-resolution transmission electron microscopy(HRTEM)analyses showed that Cu 2 O nanoparticles not only deposited on the surface of TiO 2 nanotube array,but also on the wall of TiO 2 *** Cu 2 O deposition amount could be adjusted by changing the deposition *** photoelectrochemical cathodic protection(PECCP)performance of the prepared photoelectrodes for 316l stainless steel(ss)was tested under visible *** constant current deposition time had a signifi cant eff ect on the PECCP performance of Cu 2 O/TiO 2-X photoelectrodes and Cu 2 O/TiO 2-20 had the best PECCP performance for the coupled 316l *** was attributed to the appropriate amount and thickness of Cu 2 O to form p-n heterojunctions with TiO 2,in which separation of the photogenerated carriers was accelerated and transfer of the photogenerated electrons to 316l ss for PECCP was facilitated.

关键词： Cu2O/TiO2 p-n heterojunction 316l ss photoelectrochemical cathodic protection

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Accelerated corrosion of 316l stainless steel in a simulated oral environment via extracellular electron transfer and acid metabolites of subgingival microbiota

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Bioactive Materials 2024年第5期35卷 56-66页

作者： Ying Zheng Yi Yang Xianbo liu Pan liu Xiangyu li Mingxing Zhang Enze Zhou Zhenjin Zhao Xue Wang Yuanyuan Zhang Bowen Zheng Yuwen Yan Yi liu Dake Xu liu Cao School and Hospital of Stomatology China Medical UniversityLiaoning Provincial Key Laboratory of Oral DiseasesShenyangChina Shenyang National laboratory for Materials Science Northeastern UniversityShenyangChina State Key laboratory of Rolling and Automation Northeastern UniversityShenyangChina Electrobiomaterials Institute Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyangChina College of Basic Medical Sciences Key Laboratory of Medical Cell BiologyMinistry of EducationChina Medical UniversityShenyangChina Institute of Health Sciences China Medical UniversityShenyangChina

316l stainless steel(ss)is widely applied as microimplant anchorage(MIA)due to its excellent mechanical ***,the risk that the oral microorganisms can corrode 316l ss is fully *** influenced corrosion(MIC)of 316l ss is essential to the health and safety of all patients because the accelerated corrosion caused by the oral microbiota can trigger the release of Cr and Ni *** study investigated the corrosion behavior and mechanism of subgingival microbiota on 316l ss by 16S rRNA and metagenome sequencing,electrochemical measurements,and surface characterization *** biofilms were formed by the oral subgingival microbiota in the simulated oral anaerobic environment on 316l ss surfaces,significantly accelerating the corrosion in the form of *** microbiota samples collected from the subjects differed in biofilm compositions,corrosion behaviors,and *** oral subgingival microbiota contributed to the accelerated corrosion of 316l ss via acidic metabolites and extracellular electron *** findings provide a new insight into the underlying mechanisms of oral microbial corrosion and guide the design of oral microbial corrosion-resistant materials.

关键词： Oral subgingival microbiota 316l ss Corrosion Extracellular electron transfer Acid metabolites

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