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corrosion Behavior of Different Steel Substrates Coupled With Conductive Polymer Under Different Serving Conditions

Journal of Iron and Steel Research International 2013年第8期20卷 87-92页

作者： LIU Xiao-hei XIA Zhi-dong ZHOU Hu YUAN Bo LI Zhe GUO Fu College of Materials Science and Engineering Beijing University of Technology

The corrosion behaviors of stainless steel and nickel plated carbon steel coupled with conductive polymer were investigated in both hot humid environment and simulated marine environment. The corrosion currents of dif-ferent steel substrates and conductive polymer in simulated marine environment at room temperature were measured. The corrosion surfaces of different steel couples were observed under a scanning electron microscope （SEM） and chemical compositions were examined by energy dispersive spectrum （EDS） analysis. The corrosion mechanism was discussed. The results showed that the stability of both stainless steel and nickel-plated carbon steel in hot humid en- vironment was excellent and no corrosion happened in the blank test for 360 h while slight corrosion existed in the contact area of coupled steel substrates. In simulated marine environment, the corrosion current of the stainless steel was lower than 100 μA and some directional rod-like particles formed on the surface of the stainless steel, which are mainly caused by oxidative corrosion among different phases. The corrosion current of the nickel-plated carbon steel couples was much greater than that of stainless steel couples and nickel plate cracking resulted in the corrosion of the internal iron because the coated nickel layer was not dense enough.

关键词： galvanic corrosion stainless steel nickel-plated steel conductive polymer hot humid environment

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Self-catalytic degradation of iron-bearing chemical conversion coating on magnesium alloys — Influence of Fe content

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Frontiers of Materials Science 2020年第3期14卷 296-313页

作者： Zheng-Zheng Yin Wei Huang Xiang Song Qiang Zhang Rong-Chang Zeng corrosion Laboratory for Light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao266590China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450002China

A number of industrial and biomedical fields,such as hydraulic fracturing balls for gas and petroleum exploitation and implant materials,require Mg alloys with rapid *** iron-bearing phosphate chemical conversion(PCC)coating with self-catalytic degradation function was fabricated on the Mg alloy *** morphologies,chemical compositions and degradation behaviors of the PCC coating were investigated through FE-SEM,XPS,XRD,FTIR,electrochemical and hydrogen evolution *** indicated that the PCC coating was characterized by iron,its phosphates and hydroxides,amorphous Mg(OH)2 and Mg3-n(HnPO4)*** self-catalytic degradation effects were predominately concerned with the Fe concentration,chemical composition and microstructure of the PCC coating,which were ascribed to the galvanic corrosion between Fe in the PCC coating and the Mg *** coating with higher Fe content and porous microstructure exhibited a higher degradation rate than that of the AZ31 substrate,while the coating with a trace of Fe and compact surface disclosed a slightly enhanced corrosion resistance for the AZ31 substrate.

关键词： magnesium alloy iron-bearing chemical conversion coating self-catalytic degradation galvanic corrosion

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Zn-Mg and Zn-Cu alloys for stenting applications:From nanoscale mechanical characterization to in vitro degradation and biocompatibility

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Bioactive Materials 2021年第12期6卷 4430-4446页

作者： Claudia García-Mintegui Laura Catalina Córdoba Judit Buxadera-Palomero Andrea Marquina Emilio Jiménez-Piqué Maria-Pau Ginebra JoséLuis Cortina Marta Pegueroles Biomaterials Biomechanics and Tissue Engineering GroupDepartment of Materials Science and EngineeringTechnical University of Catalonia(UPC)Barcelona East School of Engineering(EEBE)08019BarcelonaSpain Resource Recovery and Environmental Management Group UPCEEBE08019BarcelonaSpain Barcelona Research Center in Multiscale Science and Engineering UPCEEBE08019BarcelonaSpain Institute for Bioengineering of Catalonia(IBEC) 08028BarcelonaSpain Structural Integrity Micromechanics and Reliability of Materials GroupDepartment of Materials Science and EngineeringUPCEEBE08019BarcelonaSpain

In the recent decades,zinc(Zn)and its alloys have been drawing attention as promising candidates for bioresorbable cardiovascular stents due to its degradation rate more suitable than magnesium(Mg)and iron(Fe)***,its mechanical properties need to be improved in order to meet the criteria for vascular *** work investigates the mechanical properties,biodegradability and biocompatibility of Zn-Mg and Zn-Cu alloys in order to determine a proper alloy composition for optimal stent *** measurements are performed to characterize the mechanical properties at the nanoscale as a function of the Zn microstructure variations induced by *** biodegradation mechanisms are discussed and correlated to microstructure,mechanical performance and bacterial/cell *** of Mg or Cu alloying elements refined the microstructure of Zn and enhanced yield strength(YS)and ultimate tensile strength(UTS)proportional to the volume fraction of secondary ***-1Mg showed the higher YS and UTS and better performance in terms of degradation stability in Hanks’***-Cu alloys presented an antibacterial effect for *** controlled by diffusion mechanisms and by *** was dependent on the degradation rate and the nature of the corrosion products.

关键词： Zinc alloys Bioresorbable metals galvanic corrosion Nanoindentation Biocompatibility

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galvanic Interactions of Aluminium 3004 and ∝ Brass in Tropical Marine Atmosphere

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Journal of Marine Science and Application 2014年第4期13卷 455-461页

作者： S. Palraj G. Subramanian S. Palanichamy CSIR-Central Electrochemical Research Institute Karaikudi-630006 India Offshore Platform & Marine Electrochemistry Centre CSIR-CECRI Unit Harbour Area Tuticorin-628004 India

The galvanic corrosion behaviour of alumiuium 3004 - ∝ brass with different area ratios was studied in the tropical marine atmosphere at Tuticorin harbour over a period of 426 days. The area ratios, viz. AAluminiurn：A∝ brass, studied were 0.125, 0.25, 0.5, 1, 2, 4 and 8. The galvanic corrosion behaviour of the metals was studied in terms of the relative increase in the corrosion rate of aluminium due to galvanic coupling with oc brass, the relative decrease in the corrosion rate of ∝ brass due to galvanic coupling with aluminium, and the susceptibility of aluminium to pitting owing to galvanic coupling with ∝ brass. The galvanic potential and galvanic current of the system were monitored. Pits of different dimensions ranging from mild etchings to perforations were experienced on the borders arid the surfaces of the interface of aluminium in contact with ∝ brass. The corrosion products resulting from galvanic corrosion were analysed using XRD and the pitting on aluminium as a result of galvanic corrosion was highlighted in terms of pit depth, size and density of pit, using a high resolution microscope. The most favourable area ratio of aluminium - ∝ brass in marine atmosphere in terms of gravimetric corrosion rate is 8：1 and the most unfavourable area ratio of aluminium - ∝ brass is 1：4.

关键词： aluminium 3004 ∝brass galvanic corrosion corrosion products pitting tropical marine atmosphere

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Fatigue Crack Arrest in Mild Steel via Iron Electroplating

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Materials Sciences and Applications 2021年第11期12卷 484-503页

作者： Jiaming Huang Henry Cardenas Taiji Group USA Inc. Hickory USA Louisiana Tech University Ruston USA

In this work, electrochemical plating treatments were applied to ASTM A36 steel specimens to study the efficiency and limitations of this method for arresting fatigue crack propagation. Electroplated iron was deposited onto the crack surfaces using a circuit in which Swedish Iron served as the anode in a solution of Ammonium Iron(II) Sulfate Hexahydrate. The iron ions were driven into fatigue cracks that were formed within ASTM E399 compact tension specimens. This work showed that an iron-plating treatment operated at 20°C can arrest fatigue crack propagation for a significant period of cycles. The propagation re-initiation lives that resulted ranged from 11,000 to 230,000 cycles. As observed in prior work, the propagation re-initiation life correlated strongly to the magnitude of the stress intensity factor range that was applied during cycling. As this stress intensity increased, the propagation re-initiation life decreased. Repeated treatments on the same crack provided extended service lives by as much as 370,000 cycles or 60% of the entire fatigue life of the component. Future work may show that re-application of the treatment, when conducted prior to crack re-initiation, could further extend the service life indefinitely. The Correia crack closure model was modified to provide an empirical expression for predicting the crack re-initiation life of the treated component. Interestingly, highly effective arrest behavior was still observed for cracks that were loaded to stress intensity factors of only 3 - 6 during the treatment but then subjected to 20 during cyclic loading. galvanic corrosion of the plated material exposed to simulated seawater was estimated to be 3 mpy. Future work will examine the use of less active plating alloys and the possibility of applying effective treatments into cracks that are in an unloaded state.

关键词： Fatigue Crack Closure Crack Propagation Iron Plating Electrochemical Treatment galvanic corrosion

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DEVELOPMENT OF CARBON FIBER REINFORCED ALUMINUM LAMINATES

DEVELOPMENT OF CARBON FIBER REINFORCED ALUMINUM LAMINATES

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作者： Yoshihiro Takao Terutake Matsubara Heterogeneous Solid Mechanics Laboratory Research Institute for Applied Mechanics Kyushu UniversityFukuoka816 -8580Japan Heterogeneous Solid Mechanics Laboratory Research Institute for Applied Mechanics Kyushu UniversityFukuoka816 -8580Japan

＜正＞A new method to create the galvanic corrosion-resistant carbon fiber-reinforced metal laminates （CFML） is developed in this paper. Aluminum alloy 2024-T3 is selected as the metal layer. A surface treatment technique combining a sulfuric acid anodizing with a hybrid sol-gel coating for the a-luminum alloy is developed to prevent CFML from galvanic corroding. Electrochemistry tests are conducted to evaluate the properties of electrochemistry of aluminum alloy treated by the present method. The test results prove that the combination of sulfuric acid anodizing and hybrid sol-gel coating can provide good protection against the galvanic corrosion in CFML. Next, aluminum alloy sheets and carbon fiber prepreg are stacked and cured in an autoclave to fabricate CFML. The cross-section of CFML is investigated by scanning electron microscope （ SEM ） and electron probe micro analyzer （ EPMA）. Good thin interlayer consisting of composite coating films are formed between aluminum alloy and carbon fiber-reinforced epoxy layer. corrosion tests of CFML and aluminum alloy are conducted , the present CFML shown excellent corrosion resistance.

关键词： Fiber Reinforced Metal Laminates Carbon Fiber-Reinforced Aluminum Alloy galvanic corrosion Composite Coating Sulfuric Anodizing Hybrid Sol-Gel Coating

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