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Inhibition of galvanic corrosion in Al/Cu coupling model by synergistic combination of 3-Amino-1,2,4-triazole-5-thiol and cerium chloride

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Journal of Materials Science & Technology 2020年第9期44卷 102-115页

作者： inime ime udoh Hongwei Shi Mohammad Soleymanibrojeni Fuchun Liu En-Hou Han CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China University of Chinese Academy of Sciences Beijing100049China University of Science and Technology of China Hefei230026China

Asynergistic inhibition study was carried out on an aluminium/copper galvanic coupling model in neutral aerated NaCl solution using scanning vibrating electrode technique(SVET).The approach allows the simulation of the local micro-galvanic cells of AA2024-T3 obtained from the potential difference between the intermetallic particles(IMPs)and the aluminium *** inhibition effect of CeCl3 and 3-Amino-1,2,4-triazole-5-thiol(ATAT)was demonstrated by the reduction in the galvanic current density over Al and Cu *** improved inhibition from positive synergistic effect was revealed by the combination of the two inhibitors after 24 h of immersion,with the best inhibition recorded for *** electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS)and time of flight secondary ion mass spectrometry(ToF-SIMS)were used to characterize the Ce-and ATAT-based complex film formed and to illustrate the mechanism of inhibition.

关键词： Aluminium alloy Galvanic corrosion Neutral inhibition Scanning vibrating electrode technique (SVET) X-ray photoelectron spectroscopy(XPS) Time of flight secondary ion mass spectrometry(ToF-SIMS)

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Active anticorrosion and self-healing coatings:A review with focus on multi-action smart coating strategies

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Journal of Materials Science & Technology 2022年第21期116卷 224-237页

作者： inime ime udoh Hongwei Shi Enobong Felix Daniel Jianyang Li Songhua Gu Fuchun Liu En-Hou Han CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang 110159China University of Science and Technology of China Hefei 230026China

The development of smart coatings with potential for active anticorrosion and self-healing protection of metals is essential for long-term performance of metallic structures in aggressive chemical ***,emphasis has been placed on the development of advanced smart coatings for corrosion protection in different *** multifunctional coatings with fascinating stimuliresponsive functionalities are considered“smart”.The stimuli-responsive functionalities of these smart coatings when properly harnessed result in a class of coatings with inherent autonomous control of ***,when metals are exposed to aggressive environments,occurrences at the metalsolution interface cause environmental *** changes can be controlled when triggers from external environment set off active components of smart coating,thereby enhancing coating’s life and *** triggers include the availability of moisture,concentration of chloride ion,p H gradient,mechanical damage,impact,fatigue,light,redox activity and *** this review,recent technological trends in active anticorrosion and self-healing coatings as functional routes for metal protection are summarized,stimuli responsiveness and mechanisms of inhibition are discussed,and recent multi-action protective systems are particularly focused on.

关键词： Smart coating Active anticorrosion protection Self-healing Multi-action Protection mechanism

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Insights into the characteristics of corrosion products formed on the contact and exposed regions of C1045 steel bolt and nut fasteners exposed to aqueous chloride environments

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Journal of Materials Science & Technology 2023年第4期135卷 250-264页

作者： Enobong Felix Daniel Chao Li Changgang Wang Junhua Dong inime ime udoh Peter Chukwuemeka Okafor Dongjiu Zhang Wenan Zhong Sheng Zhong School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang 110159China Corrosion and Electrochemistry unit Department of Pure and Applied ChemistryUniversity of CalabarP.M.B 1115 CalabarCross River StateNigeria Key Laboratory of Space Launching Site Reliability Xichang Satellite Launch CenterHainan Haikou 571126China

This study investigated the characteristics of corrosion products formed on the contact and exposed re-gions of C1045 steel bolt and nut fasteners exposed to aqueous chloride *** corroded sur-face morphology,rust compositions,and corrosion kinetics of the bolt specimen were studied by visual observation,optical microscopy(OM),scanning electron microscopy(SEM),X-Ray diffractometry(XRD),micro-Raman,electron probe micro-analyser(EPMA),and potentiodynamic polarization ***-sults obtained showed a variation in corrosion kinetics,morphology,and composition of the rust layer which were driven by differential aeration and concentration *** to the availability of sufficient dissolved oxygen,the oxyhydroxide compound,lepidocrocite(γ-FeOOH)was detected in the outer rust layer in the exposed region,whereas the inner rust layer was composed of magnetite(Fe_(3)O_(4)).How-ever,the oxygen-deficient contact surface revealed the presence of akaganeite(β-FeOOH)and magnetite(Fe_(3)O_(4))as dominant oxide *** most stable phase,goethite(α-FeOOH)was also detected in the rust formed in both regions,though in significantly low ***,owing to variation in environmental conditions,the amount and density of the rust layer varied in the different *** estimated corrosion stability values for the different regions revealed that the corrosion products formed on the steel surfaces were non-protective,suggesting the need for specific surface treatment as a protec-tive measure.

关键词： Carbon steel Bolt-nut fastener Raman SEM-EDS XRD Rust characterization

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Corrosion Behaviour of Carbon Steel Fasteners in Neutral Chloride Solution

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Acta Metallurgica Sinica(English Letters) 2022年第4期35卷 563-576页

作者： Enobong Felix Daniel Junhua Dong Xiaofang Li Ini-Ibehe Nabuk Etim inime ime udoh Rongyao Ma Lei Chen Changgang Wang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang 110159China Department of Marine Biology Akwa Ibom State UniversityP.M.B 1167UyoNigeria

An experimental model for simulating the corrosion of carbon steel fasteners(bolt and nut) composed of a contact carbon steel electrode(CCSE) and an exposed bare carbon steel plate electrode(BCSE) was designed. The effect of coupling on the corrosion process of the galvanically coupled carbon steel electrode was evaluated and compared with the self-corrosion process observed independently at the exposed and contact regions. Results obtained indicated that at an equal area ratio and uncoupled conditions, the corrosion rate is accelerated in the surface directly exposed to bulk solution compared to the bolt surface in contact with the nut. A coupling current was recorded when the exposed surface(BCSE) was electrically connected with the contact surface(CCSE);with the CCSE acting as the anode thereby suppressing the corrosion process in the exposed surface. By implication, the galvanic coupling between CCSE and BCSE increased the corrosion rate of CCSE. The diff erence in oxygen supply was responsible for the coupling effect observed in the system as there was no decrease in the solution pH. Moreover, varying the cathode-to-anode area( S c/S a) ratio significantly influenced the corrosion current density as increased S c/S a ratio resulted in an accelerated galvanic corrosion process. The corroded surfaces and interfaces were analysed using stereomicroscopy and scanning electron microscopy. X-ray diff ractometry was adopted for corrosion product characterization. The results obtained showed supportive evidence of the corrosion behaviour in carbon steel fasteners.

关键词： Bolt and nut Galvanic current density Zero resistance ammetry(ZRA) Coupling potential Differential aeration cell Carbon steel fasteners

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Corrosion Behaviour of Carbon Steel Fasteners in Neutral Chloride Solution

Corrosion Behaviour of Carbon Steel Fasteners in Neutral Chl...

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第十一届全国腐蚀与防护大会

作者： Enobong Felix Daniel Junhua Dong Xiaofang Li Ini-Ibehe Nabuk Etim inime ime udoh Ma Rongyao Chen Lei Changgang Wang School of Materials Science and Engineering University of Science and Technology of China Hefei Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

This report focuses on the galvanic-crevice effect in the corrosion behaviour of carbon steel bolt and nut fasteners in simulated marine environments. The experimental studies were conducted at both coupled and uncoupled conditions using electrochemical and weight loss methods. Surface analysis was performed via stereomicroscopy（SM） and scanning electron microscopy（SEM）. X-ray diffractometry（XRD） was adopted for corrosion products characterization. Results obtained indicate that at an equal area ratio, the corrosion rate is accelerated in the region directly exposed to bulk solution compared to the contact（crevice）region at uncoupled conditions. Under coupled conditions, the bolt-nut contact region acts as the anode thereby suppressing the corrosion process at the exposed region, resulting in an increased corrosion process at the contact region. The difference in oxygen supply is responsible for the galvanic-crevice effect observed in the system as there is no observable decrease in the solution pH. Moreover, varying the cathode-to-anode area（Sc/Sa） ratio significantly influences the corrosion current density as increased Sc/Sa ratio resulted in an accelerated galvanic corrosion process. This study provides useful insight into the formulation of effective corrosion control measures for carbon steel fasteners.

关键词： Bolt and nut galvanic current density ZRA coupling potential differential aeration cell

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