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A New Understanding of Stress corrosion Cracking Mechanism of X80 Pipeline Steel at Passive Potential in High-pH Solutions

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Acta Metallurgica Sinica(English Letters) 2015年第7期28卷 866-875页

作者： Lin Fan Zhi-Yong Liu Wei-Min Guo Jian Hou Cui-Wei Du Xiao-Gang Li corrosion and protection Center University of Science and Technology Beijing State Key Laboratory for Marine corrosion and protection Luoyang Ship Material Research Institute

Susceptibilities to stress corrosion cracking（SCC） of X80 pipeline steel in relatively concentrated carbonate/bicarbonate solutions with different chloride ion concentrations or p H value at a passive potential of-200 m V vs SCE were investigated by slow strain rate tensile *** order to explore the SCC mechanism and the evaluation criterion for the SCC susceptibility of the steel in passive state,electrochemical measurements were *** polarization curves were obtained at different potential sweep rates,and electrochemical impedance spectroscopy measurements were taken after fast polarization to the passive *** effects of chloride ion and p H on SCC behaviors of X80 steel at the passive potential were also *** results showed that the SCC mechanism of X80 pipeline steel was greatly influenced by the passive film formed in these *** SCC behaviors followed the film suppressed anodic dissolution mechanism in these circumstances,because the filming process accounted for a considerable proportion of the overall electrode *** criteria for evaluating the SCC susceptibility of the steel at passive potential were proposed and *** in the concentration of chloride ion or increasing in p H value resulted in the reduction in SCC *** existence of chloride ion greatly lowered the passivation tendency and the film stability,while its concentration determined the dissolution rate of the steel *** p H value was responsible for the stable and tenacious passive films and the high repassivation *** was also inclined to lower the anodic dissolution rate at crack tips by retarding the cathodic oxygen reduction.

关键词： Pipeline steel Stress corrosion cracking (SCC) Passivation Chloride ion pH value

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Electrochemical corrosion behavior of 300M ultra high strength steel in chloride containing environment

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Acta Metallurgica Sinica(English Letters) 2010年第4期23卷 301-311页

作者： Min SUN Kui XIAO Chaofang DONG Xiaogang LI corrosion and protection Center School of Material and Engineering University of Science and Technology Beijing Beijing 100083 China

The electrochemical corrosion behavior of 300M ultra high strength steel in chloride containing environment was investigated by potentiodynamic polarization technique, electrochemical impedance spectroscopy （EIS） and scanning electron microscopy （SEM）. The results show that uniform corrosion occurs on 300M steel during the elec- trochemical measurements because no anodic passivation phenomenon is observed on polarization curves within the measurement range. The tests also show that 300M steel is highly susceptible to chloride containing solution, which is characterized by corrosion current density increasing with the addition of chlorides, and corrosion potential shifting towards positive direction and corrosion resistance decreasing, pos- itively suggesting that chloride ions speed up the corrosion rate of 300M steel. Mean- while corrosion products on the 300M steel surface formed during the salt spray test are too loose and porous to effectively slow down the corrosion rate. Additionally, a schematic structure of uniform corrosion mechanism can explain that 300M steel has better property of stress corrosion cracking （SCC） resistance than stainless steels.

关键词： 300M ultra high strength steel Electrochemical corrosion Chloride

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Pitting corrosion of 2Cr13 stainless steel in deep-sea environment

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Journal of materials Science & Technology 2021年第5期64卷 187-194页

作者： Xinhua Wang Lin Fan Kangkang Ding Likun Xu Weimin Guo Jian Hou Tigang Duan State Key Laboratory for Marine corrosion and protection Luoyang Ship Material Research InstituteQingdao 266237China

Pitting corrosion of 2Cr13 stainless steel was investigated by deep-sea exposure test at various depths of 500 m,800 m and 1200 m in the South China Sea for 4 *** the aid of electrochemical measurements in simulated deep-sea environments and grey relational analysis,the influence of deepsea environments on passive film and the mechanism of pitting corrosion were *** results indicated that with the increase of sea depth,pitting depth of 2Cr13 stainless steel increased,which can be attributed to the change of chemical composition and the degradation of pitting resistance of passive *** growth was greatly retarded in the condition of low seawater temperature and low dissolved oxygen content of deep sea,resulting in an unstable and vulnerable *** depth was most influenced by hydrostatic pressure,which can increase the adsorption and penetration of Cl-ion,and promote the proliferation of point defects in passive film,leading to rapid deconstruction of protective oxides of the *** sensitivity of 2Cr13 stainless steel increased eventually with the combination of accelerated dissolution and suppressed self-healing of passive film in deep sea.

关键词： Stainless steel Deep sea Pitting corrosion Passive film Grey relational analysis

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Research on anti-corrosion property of rare earth inhibitor for X70 steel

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Journal of Rare Earths 2013年第7期31卷 734-740页

作者：朱艳华庄稼于永生曾宪光 School of materials Science and Engineering Southwest Petroleum University material corrosion and protection Key Laboratory of Sichuan Province

Three kinds of rare earth nitrates were adopted to sodium molybdate to get three kinds of LnN-M compounded inhibitors （La（NO3）3＋Na2MoOa（LaN-M）, Ce（NO3）3＋Na2MoOn（CeN-M）, Pr（NO3）3＋Na2MoO4（PrN-M））. The combination of weight-loss method and the electrochemical test, was used to evaluate and analyze the corrosion inhibition efficiency of these LnN-M inhibitors to make the research on their corrosion inhibition performance, and the sequential order of their performance was found as follows： CeN-M〉 LaN-M〉PrN-M, among which, the inhibition efficiency of CeN-M for the X70 steel could reach 98.21%. The synergism parameters were calculated by weight-loss method, these computational data indicated that the synergistic effect between rare earth nitrates and sodium molybdate was obvious and significant. Surface morphology, chemical composition and phase components of the precipitation films were tested for discussing the mechanism of LnN-M inhibitors. The outer electronic configuration of the lanthanide was found to have an important influence on the inhibition efficiency. The CeN-M inhibitor was discovered to have the best inhibition effect with the amorphous cerium oxides. The results of this research revealed that the precipitation films formed on the surface of the steel samples had a crucial influence on the inhibition efficiencies after adding LnN-M inhibitors.

关键词： LnN-M inhibitor corrosion inhibition performance X70 steel mass-loss method inhibition mechanism rare earths

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Electrochemical corrosion failure mechanism of M152 steel under a salt-spray environment

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International Journal of Minerals,Metallurgy and materials 2015年第11期22卷 1183-1189页

作者： Pan Yi Kui Xiao Kang-kang Ding Xu Wang Li-dan Yan Cheng-liang Mao Chao-fang Dong Xiao-gang Li corrosion and protection Center University of Science and Technology Beijing Institute of Advanced materials and Technology University of Science and Technology Beijing State Key Laboratory for Marine corrosion and protection Luoyang Ship Material Research Institute Ningbo Institute of material Technology & Engineering Chinese Academy of Sciences

The corrosion failure mechanism of M152 was studied using the neutral salt-spray test to better understand the corrosion behavior of 1Cr12Ni3Mo2VN（M152）, provide a basis for the optimization of material selection, and prevent the occurrence of failure. Moreover, the mechanism was investigated using the mass loss method, polarization curves, electrochemical impedance spectroscopy（EIS）, stereology microscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy（EDS）. The results show that M152 steel suffers severe corrosion, especially pitting corrosion, in a high-salt-spray environment. In the early stage of the experiment, the color of the corrosion products was mainly orange. The products then gradually evolved into a dense, brown substance, which coincided with a decrease of corrosion rate. Correspondingly, the EIS spectrum of M152 in the late test also exhibited three time constants and presented Warburg impedance at low frequencies.

关键词： heat-resistant steel electrochemical corrosion failure mechanism salt spray test

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Effects of Carbon Content and Microstructure on corrosion Property of New Developed Steels in Acidic Salt Solutions

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Acta Metallurgica Sinica(English Letters) 2014年第1期27卷 115-123页

作者： Feilong Sun Xiaogang Li Xuequn Cheng corrosion and protection Center University of Science and Technology Beijing Key Laboratory of corrosion and protection(Ministry of Education)

New steels with different carbon contents were self-developed by thermo-mechanical controlled processing. The effects of the carbon content and the microstructure on the corrosion properties of new steels were investigated by immersion test and SEM. The results indicated that the ferrite phase （both the proeutectoid and eutectoid ferrite） dissolved preferentially. Cementite reserved and accumulated on the surface. As carbon content increased, the content of ferrite decreased and cathode/anode area ratio increased. Therefore, the corrosion rate of new steels increased from 0.30 to 0.90 mm/years when the carbon content rose from 0.05 to 0.13 wt%. The corrosion process of new steels was studied using electrochemical impedance spectroscopy experiments during 72 h. It indicated that the impedance modulus *** nz of the new steels reduces with the increase of the immersion time. While the corrosion process of the new steel with 0.11 wt% C developed faster than that with 0.07 wt% C, although their *** nz was similar at the initial stage.

关键词： Carbon content Microstructure corrosion behavior Electrochemical impedance spectroscopy SEM

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Assessing the corrosion protection property of coatings loaded with corrosion inhibitors using the real-time atmospheric corrosion monitoring technique

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International Journal of Minerals,Metallurgy and materials 2025年第1期32卷 119-126页

作者： Xiaoxue Wang Lulu Jin Jinke Wang Rongqiao Wang Xiuchun Liu Kai Gao Jingli Sun Yong Yuan Lingwei Ma Hongchang Qian Dawei Zhang School of Energy and Power Engineering Beihang UniversityBeijing 100191China Beijing Institute of Space Long March Vehicle Beijing 100076China National materials corrosion and protection Data Center University of Science and Technology BeijingBeijing 100083China Institute of materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China Shanghai Spaceflight Precision Machinery Institute Shanghai 201600China

The atmospheric corrosion monitoring(ACM)technique has been widely employed to track the real-time corrosion behavior of metal ***,limited studies have applied ACM to the corrosion protection properties of organic *** study compared a bare epoxy coating with one containing zinc phosphate corrosion inhibitors,both applied on ACM sensors,to observe their corrosion protection properties over *** with artificial damage via scratches were exposed to immersion and alternating dry and wet environments,which allowed for monitoring galvanic corrosion currents in *** the corrosion tests,the ACM currents of the zinc phosphate/epoxy coating were considerably lower than those of the blank epoxy *** trend in ACM current variations closely matched the results obtained from regular electrochemical tests and surface *** alignment highlights the potential of the ACM technique in evaluating the corrosion protection capabilities of organic *** with the blank epoxy coating,the zinc phosphate/epoxy coating showed much-decreased ACM current values that confirmed the effective inhibition of zinc phosphate against steel corrosion beneath the damaged coating.

关键词： atmospheric corrosion monitoring technology corrosion inhibitor coating carbon steel corrosion protection

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Modification of NiCoCrAlY with Pt: Part Ⅰ. Effect of Pt depositing location and cyclic oxidation performance

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Journal of materials Science & Technology 2019年第3期35卷 341-349页

作者： Yingfei Yang Hongrui Yao Zebin Bao Pan Ren Wei Li Institute of Advanced Wear & corrosion Resistant and Functional material Jinan University corrosion and protection Division Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

Pt layers of 5 μm in thickness were electroplated before or after depositing NiCoCrAlY coating by arc ion plating(AIP) aiming for identifying the effect of Pt enriching position on microstructure and cyclic oxidation behavior of Pt modified NiCoCrAlY coatings. Al-rich zones formed at the same position of Ptrich zones for both modified coatings due to uphill diffusion of Al driven by Pt. Cyclic oxidation tests at 1000 and 1100?C indicated that oxidation resistance of NiCoCrAlY was improved by Pt modification via different mechanisms: at surface, Pt-rich zone promoted selective oxidation of Al to form α-Al_2O_3,whilst at coating/substrate interface Pt-rich zone acted as effective diffusion barrier for titanium. Roles of Pt played in enhancing the oxidation performance of various Pt-modified NiCoCrAlY coating were investigated.

关键词： Cyclic oxidation Pt-modification NiCoCrAlY Electron probe micro-analysis(EPMA)

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Transient Current Behaviour for Iron in 3.5%NaCl and 3.5%NaCl+ 1%NaNO_2 Solutions during corrosion Fatigue

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Journal of materials Science & Technology 1996年第4期12卷 291-298页

作者： Zhengfu WANG Xuejun WEI Jin LI and Wei KE(State Key Lab. for corrosion and protection, Institute of corrosion and protection of Metals,Chinese Academy of Sciences, Shenyang 110015, China) State Key Lab. for corrosion and protection Institute of Corrosion and Protection of Metals Chinese Academy of Sciences Shenyang 110015 China

The transient current behaviour for Iron in 3.5%NaCl and 3.5%NaCl +1%NaNO2 solutions during corrosion fatigue (CF) process has been investigated at different given strain amplitudes and strain rates. The results show that elastic strain has little contribution to material dissolution. The elastic tension strain results in the decrease in the transient current, while the elastic compression strain increases the transient current. Compared to the elastic deformation, plastic deformation affects material dissolution evidently For iron in 3.5%NaCl solution, the strain amplitude plays a dominant role in the dissolution process accelerated by the plastic strain, while in 3.5%NaCl+1%NaNO2 solution, both the strain amplitude and strain rate play an important role in this process. In this paper, the effect of the elastic deformation on the material dissolution and the relation between the tension and compression current peak values under the plastic cycle deformation are discussed

关键词： Transient Current Behaviour for Iron in 3.5%NaCl and 3.5%NaCl SCE NaNO2 Solutions during corrosion Fatigue

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CYCLIC OXIDATION OF Ni-La_2O_3 COMPOSITE COATINGS ELECTRODEPOSITED ON NICKEL AND Fe26Cr STAINLESS STEEL

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中国有色金属学会会刊：英文版 1997年第3期7卷 15-21页

作者： Peng, Xiao Li, Tiefan Wu, Weitao Inst of corrosion and protection of Metals Shenyang China

ＣＹＣＬＩＣＯＸＩＤＡＴＩＯＮＯＦＮｉＬａ２Ｏ３ＣＯＭＰＯＳＩＴＥＣＯＡＴＩＮＧＳＥＬＥＣＴＲＯＤＥＰＯＳＩＴＥＤＯＮＮＩＣＫＥＬＡＮＤＦｅ２６ＣｒＳＴＡＩＮＬＥＳＳＳＴＥＥＬ①ＰｅｎｇＸｉａｏ１，２，ＬｉＴｉｅｆ... 详细信息

ＣＹＣＬＩＣＯＸＩＤＡＴＩＯＮＯＦＮｉＬａ２Ｏ３ＣＯＭＰＯＳＩＴＥＣＯＡＴＩＮＧＳＥＬＥＣＴＲＯＤＥＰＯＳＩＴＥＤＯＮＮＩＣＫＥＬＡＮＤＦｅ２６ＣｒＳＴＡＩＮＬＥＳＳＳＴＥＥＬ①ＰｅｎｇＸｉａｏ１，２，ＬｉＴｉｅｆａｎ１，２，ＷｕＷｅｉｔａｏ１Ｓｔ...

关键词： nickel Fe26Cr stainless steel cyclic oxidation electrodeposited Ni La 2O 3 composite film

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