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Corrosion Behavior of Pre-oxidized GH4169 Alloy with Solid NaCI Deposited in a Wet Oxygen Flow at 600 ℃

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Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1249-1264页

作者： Weidong Zhang Yu Cui Li Liu Wenquan wang Wenzheng Chen Rui Li fuhui wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang110819China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

The corrosion behavior of the pre-oxidized GH4169 alloy was studied after 20 h of exposure under a solid NaCl deposit film in a wet O_(2) environment at 600℃ by mass-gain measurements,X-ray diffraction,scanning electron microscopy,transmission electron microscopy *** results indicate that the pre-oxidized GH4169 alloy undergoes serious corrosion in the corrosive *** preformed Cr_(2)O_(3) layer is gradually destroyed by deposit NaCl,and the inner Nb2O5 layer beneath the complete outer Cr_(2)O_(3) layer also reacts with NaCl to form NaNbO_(3).The electrochemical test results testified the existence of electrochemical reactions during this corrosion *** corrosion behavior of pre-oxidized GH4169 under a solid NaCl deposit film in a wet O_(2) environment at 600℃has been discussed in detail.

关键词： Pre-oxidation Solid NaCl Wet O2 Electrochemical corrosion

Enhancing corrosion resistance of plasma electrolytic oxidation coatings on AM50 Mg alloy by inhibitor containing Ba(NO_(3))_(2) solutions

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International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 2048-2061页

作者： Jirui Ma Xiaopeng Lu Santosh Prasad Sah Qianqian Chen You Zhang fuhui wang Corrosion and Protection Center Northeastern UniversityShenyang110819China Faculty of Engineering Hokkaido UniversityHokkaido 060-8628Japan College of New Materials and Chemical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China

To enhance the long-term corrosion resistance of the plasma electrolytic oxidation(PEO)coating on the magnesium(Mg)alloy,an inorganic salt combined with corrosion inhibitors was used for posttreatment of the *** this study,the corrosion performance of PEO-coated AM50 Mg was significantly improved by loading sodium lauryl sulfonate(SDS)and sodium dodecyl benzene sulf-onate into Ba(NO_(3))_(2) post-sealing *** electron microscopy,X-ray photoelectron spectroscopy,X-ray diffraction,Fourier transform infrared spectrometer,and ultraviolet-visible analyses showed that the inhibitors enhanced the incorporation of BaO_(2) into PEO *** impedance showed that post-sealing in Ba(NO_(3))_(2)/SDS treatment enhanced corrosion resistance by three orders of *** total impedance value remained at 926Ω·cm^(2)after immersing in a 0.5wt%NaCl solution for 768 h.A salt spray test for 40 days did not show any obvious region of corrosion,proving excellent post-sealing by Ba(NO_(3))_(2)/SDS *** corrosion resistance of the coating was enhanced through the synergistic effect of BaO2 pore sealing and SDS adsorption.

关键词： Mg plasma electrolytic oxidation posttreatment corrosion resistance

Effect of exogenous flavins on the microbial corrosion by Geobacter sulfurreducens via iron-to-microbe electron transfer

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Journal of Materials Science & Technology 2024年第4期171卷 129-138页

作者： Yuting Jin Jiaqi Li Mingxing Zhang Borui Zheng Dake Xu Tingyue Gu fuhui wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China Department of Chemical and Biomolecular Engineering Institute for Corrosion and Multiphase TechnologyOhio UniversityAthens OH 45701USA

Microbes can cause or accelerate metal corrosion,leading to huge losses in corrosion damages each *** sulfurreducens is a representative electroactive bacterium in many soils,sediments,and wastew-ater *** has been confirmed to directly extract electrons from elemental ***,little is known about the effect of electron shuttles in *** corrosion on stainless *** this study,we report that exogenous flavins promote iron-to-microbe electron transfer,accelerating micro-bial *** caused 1.3 times deeper pits and increased electron uptake(with 2 times increase of i_(corr))from stainless steel when riboflavin was added to the culture ***-deficient mutant data suggest that *** utilizes riboflavin as a bound-cofactor in outer membrane c-type *** finding that,in the presence of microbes,riboflavin can substantially accelerate corrosion highlights the role of flavin redox cycling for enhanced iron-to-microbe electron transfer by *** and provides new insights in microbial corrosion.

关键词： Extracellular electron transfer Microbiological corrosion Geobacter sulfurreducens Outer membrane c-type cytochromes Exogenous flavins

A Semi-Mechanistic Model for Predicting the Service Life of Composite Coatings on VW63Z Magnesium Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1161-1176页

作者： Xiaoxue wang Jingjing Guo Zihao Zeng Peng Zhou Rongqiao wang Xiuchun Liu Kai Gao Jingli Sun Yong Yuan fuhui wang School of Energy and Power Engineering Beihang UniversityBeijing100191China Beijing Institute of Space Long March Vehicle Beijing100076China The School of Materials Science and Engineering Northeastern UniversityShenyang110819China The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819China Shanghai Spaceflight Precision Machinery Institute Shanghai201600China

The application of Mg alloys is always accompanied by various coating technology, but a reliable model predicting the service life of coatings on Mg alloys is lacking but urgent. In this work, a semi-mechanistic model was proposed to predict the service life of plasma electrolytic oxidation (PEO) coating/electrophoretic coatings on a VW63Z Mg alloy;the model was decomposed into three parts: a first part depicting the degradation time of organic coating (L_(1)) and the diffusion time of electrolyte in the inorganic coating (L_(2)), respectively;a second part interpreting the breakdown of coatings due to the corrosion process (L_(3));a final part establishing an algorithm converting the accelerated tests into the real service environment (α);the effect of structural stress and dissimilar metal joints on the service life of coatings was also considered. Based on the ongoing accelerated experiments, the semi-mechanistic model could be able to predict the service life of both PEO coatings and composite coatings on VW63Z Mg alloy with a satisfiable precision.

关键词： Magnesium alloy Service life prediction Plasma electrolytic oxidation Electrophoretic coating Corrosion resistance

Electrically conductive nanowires controlled one pivotal route in energy harvest and microbial corrosion via direct metal-microbe electron transfer

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Journal of Materials Science & Technology 2024年第7期174卷 226-233页

作者： Yuting Jin Jiaqi Li Toshiyuki Ueki Borui Zheng Yongqiang Fan Chuntian Yang Zhong Li Di wang Dake Xu Tingyue Gu fuhui wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China Department of Chemical and Biomolecular Engineering Institute for Corrosion and Multiphase TechnologyOhio UniversityAthensOH 45701USA

Extracellular electron transfer(EET)plays a critical role in bioelectrochemical processes,allowing cou-pling between microorganisms and extracellular solid-state electrodes,metals,or other cells in energy *** studies have suggested a role for outer-surface c-type cytochromes in direct metal-to-microbe electron transfer by Geobacter sulfurreducens,a model electroactive ***,we ex-amined the possibility of other microbially produced electrical contacts by deleting the gene for PilA,the protein monomer that *** assembles into electrically conductive protein nanowires(e-pili).Deleting pilA gene inhibited electron extraction from pure iron and 316L stainless steel up to 31%and 81%,respectively more than deleting the gene for the outer-surface cytochrome *** PilA-deficient phenotype,and the observation that relatively thick biofilms(21.7μm)grew on the metal surfaces at multi-cell distances from the metal surfaces suggest that e-pili contributed significantly to microbial cor-rosion via direct metal-to-microbe electron *** results have implications for the fundamental understanding of electron harvest via e-pili by electroactive microbes,their uses in bioenergy production,as well as in monitoring and mitigation of metal biocorrosion.

关键词： Electrically conductive protein nanowires Direct metal-to-microbe electron transfer Geobacter sulfurreducens Outer-surface c-type cytochromes Biofilm

放电等离子烧结Ni20Cr-xAl合金的高温氧化行为

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金属学报 2024年第4期60卷 485-494页

作者：刘丞济孙文瑶陈明辉王福会东北大学沈阳材料科学国家研究中心东北大学联合研究分部沈阳110819

高温氧化是限制镍基高温合金服役寿命的主要因素之一。本工作旨在通过调控Al含量来提升Ni20Cr合金的抗氧化性能。采用机械合金化(MA)和放电等离子烧结(SPS)的方法制备了Al含量(质量分数)分别为1.5%、3.0%、5.0%的Ni20Cr-xAl合金,对比研... 详细信息

高温氧化是限制镍基高温合金服役寿命的主要因素之一。本工作旨在通过调控Al含量来提升Ni20Cr合金的抗氧化性能。采用机械合金化(MA)和放电等离子烧结(SPS)的方法制备了Al含量(质量分数)分别为1.5%、3.0%、5.0%的Ni20Cr-xAl合金,对比研究了SPS制备合金与相同成分铸态合金在900℃空气中的高温氧化行为。结果表明,SPS制备合金成分、组织均匀且晶粒细小,大量晶界显著加速了元素的扩散,在Al含量为1.5%时,Al内氧化严重,Cr快速外氧化生成含有大量孔隙和裂纹的Cr_(2)O_(3)膜,而在Al含量为3.0%和5.0%时,形成了保护性的连续致密的α-Al_(2)O_(3)薄膜,合金内部弥散的Al_(2)O_(3)颗粒为外Al_(2)O_(3)膜提供了形核位点并起到了钉扎作用,因此2者表现出优异的抗氧化性能,氧化速率分别为1.06×10^(-7)和4.92×10^(-8)mg^(2)/(cm^(4)·s)。铸态合金都发生了内氧化,而且无法形成连续的外Al_(2)O_(3)膜,氧化膜的主要成分为疏松多孔的Cr_(2)O_(3),因而氧化速率快且发生了氧化膜开裂和剥落。

关键词：高温合金细晶结构高温氧化放电等离子烧结

热障涂层与单晶高温合金互扩散控制方法研究进展

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材料工程 2024年第9期52卷 94-103页

作者：李崎顺姚红蕊王娜鲍泽斌朱圣龙王福会沈阳化工大学辽宁省特种功能材料合成与制备重点实验室沈阳110142 中国科学院金属所师昌绪先进材料研究中心沈阳110016 东北大学沈阳材料科学国家实验室沈阳110819

目前,二代及更高级单晶涡轮叶片的表面服役温度已达到1050℃以上,因此涂层与基体间的元素互扩散十分严重。互扩散不仅会消耗涂层中的有益元素,降低涂层服役寿命,而且会在单晶基体中形成二次反应区,严重损害单晶基体的力学性能。扩散障... 详细信息

目前,二代及更高级单晶涡轮叶片的表面服役温度已达到1050℃以上,因此涂层与基体间的元素互扩散十分严重。互扩散不仅会消耗涂层中的有益元素,降低涂层服役寿命,而且会在单晶基体中形成二次反应区,严重损害单晶基体的力学性能。扩散障和低互扩散性涂层是控制热障涂层与单晶基体间元素互扩散的有效方法。结合国内外最新研究进展,本文首先对扩散障的设计原理、基本特性以及分类作简要介绍,并具体分析了金属扩散障、陶瓷扩散障和活性扩散障存在的主要问题以及针对这些问题开展的相关研究工作;其次,对低互扩散性涂层在热障涂层领域中的应用与最新发展动态进行综述,详细讨论了纳米晶涂层、相平衡涂层和γ′基涂层的高温防护性能和阻扩散机制。在此基础上,指出了扩散障和低互扩散性涂层的未来发展方向。

关键词：单晶高温合金热障涂层互扩散二次反应区扩散障

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Protective Properties of High Temperature Oxide Films on Ni-based Superalloys in 3.5% NaCl Solution

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Journal of Materials Science & Technology 2007年第4期23卷 541-546页

作者： Huiping BAI fuhui wang State Key Laboratory for Corrosion and Protection Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The electrochemical behaviors of high temperature oxide film formed on the sputtered microcrystalline coating of M38 alloy （mc-M38） were investigated by potentiodynamic and electrochemical impedance spectroscopy （EIS） techniques in 3.5% NaCl solution. Mott-Schottky analysis was used to study the semi-conductive properties of the surface oxide. The results of the capacitance measurements showed that the oxide films on both the coating and the cast alloy were p-type semiconducting characteristics. Both the carrier density （Na）and the flat band potential （Efb） were obviously frequency-dependent, and the optimal frequency range was from 1000 to 1500 Hz. The oxidized coating exhibited higher protectivity than the oxidized cast alloy due to the lower carrier density compared with that of the oxidized cast alloy. The EIS data of the long-term immersing tests suggested that the oxide film served as an inner-barrier layer against chloride ions. The penetration of the aggressive ions into the surface oxide resulted in the decreased polarization resistance as a function of the immersion time.

关键词： High temperature oxide film Protective properties EIS Mott-Schottky analysis

Inconel 718及其渗铝涂层在Na_(2)SO_(4)+5%NaCl混合盐膜下的热腐蚀行为

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中国腐蚀与防护学报 2024年第3期44卷 623-634页

作者：胡琪耿树江王金龙王福会孙清云吴勇夏思瑶东北大学、沈阳材料科学国家研究中心东北大学联合研究分部沈阳110819 中国机械总院集团武汉材料保护研究所有限公司武汉430030

采用化学气相沉积(CVD)工艺在镍基高温合金Inconel 718上制备了铝化物涂层,研究了Inconel 718合金及其渗铝涂层在750,850和950℃空气中Na_(2)SO_(4)+5%(质量分数)NaCl混合盐膜下的热腐蚀行为。结果表明:基体表现出较差的抗腐蚀性能,且... 详细信息

采用化学气相沉积(CVD)工艺在镍基高温合金Inconel 718上制备了铝化物涂层,研究了Inconel 718合金及其渗铝涂层在750,850和950℃空气中Na_(2)SO_(4)+5%(质量分数)NaCl混合盐膜下的热腐蚀行为。结果表明:基体表现出较差的抗腐蚀性能,且温度越高腐蚀越严重;腐蚀初期表面腐蚀产物主要由Cr_(2)O_(3)和Fe_(2)O_(3)组成,而随着腐蚀时间增加,尖晶石为主要腐蚀产物。此外,基体合金在850和950℃时的腐蚀膜疏松多孔,观察到开裂和剥落,抗腐蚀能力差;而渗铝涂层表现良好,腐蚀期间表面会形成Al_(2)O_(3)膜,极大提高了基体合金的抗腐蚀性能。虽然当腐蚀温度升高或腐蚀时间增加时,涂层会发生明显退化,且会导致腐蚀膜出现裂纹、孔洞等缺陷,其与涂层结合不紧密,但仍能在很大程度上有效保护基体。

关键词： Inconel 718 CVD渗铝涂层 Na_(2)SO_(4)+5%NaCl 热腐蚀