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galvanic corrosion of AZ31B joined to dual-phase steel with and without Zn layer by ultrasonic and friction stir welding

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Journal of Magnesium and Alloys 2023年第2期11卷 462-479页

作者： Jiheon Jun Vineet V.Joshi Alasdair Crawford Vilayanur Viswanathan Donovan N.Leonard Jian Chen Piyush Updadhyay Yong Chae Lim Zhili Feng Oak Ridge National Laboratory Oak RidgeTNUSA Pacific Northwest National Laboratory RichlandWashingtonUSA

galvanic corrosion of AZ31B joined with bare or Zn-coated DP590 steel by ultrasonic spot welding or linear friction stir welding was quantitatively studied by pre-defining anode and cathode in the lap joint samples. corrosion volume and depth from Mg anode surfaces exposed to 0.1 M sodium chloride solution was analyzed as functions of cathode surface type and welding method. Characterization of as-welded joints was performed to identify any microstructural feature of the bonding zone that could impact galvanic corrosion *** modeling with modified user subroutine was conducted to simulate the progression of Mg corrosion in the same joint and electrode configurations used for the corrosion experiments. The experimental results indicated that Zn-coated cathode surface can reduce Mg galvanic corrosion significantly as galvanic polarization and cathodic current on Zn-coated surface remained relatively low for Mg in the weld *** modeling described the growth of Mg galvanic corrosion in a reasonable manner but showed limitation by underestimating the corrosion volume as it did not capture self-corrosion.

关键词： Mg alloy Zn coating Ultrasonic spot welding Friction stir welding galvanic corrosion

galvanic corrosion behavior of die cast AZ91D magnesium alloy in chloride solution

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Journal of University of Science and Technology Beijing 2004年第2期11卷 127-132页

作者： ZhensongTong WeiZhang JiuqingLi JinGao JiquanHe JiZhou corrosionandProtectionCenter UniversityofScienceandTechnologyBeijingBeijing100083China

: The galvanic corrosion behavior of die cast AZ91D magnesium alloy coupled with H62 brass, 316L stainless steel, A3 steel and LY12 aluminum alloy of different areas in 3.5% NaCl solution was studied. The free corrosion potentials, galvanic potentials and currents of these galvanic couples were measured. The galvanic effects were determined by the mass loss and regression method using three points. The results show that: (1) In these four kinds of couples AZ91D acts as the anode, whose galvanic corrosion behavior is mainly controlled by the cathodic polarization; (2) The free corrosion potentials of these four kinds of couples change a little with time and cathodic/anodic area ratio (CAAR); (3) The galvanic potential of AZ91D/LY12 moves positively with the increase of time and CAAR; (4) The galvanic currents increase with CAAR, but there is difference in the current change between different couples; (5) The anodic dissolution rate of the magnesium alloy increases by 2-3 orders after being coupled with these four kinds of metals and the galvanic effects of these couples have such a relation as γH62> γ316L.S.S>γLY12>γA3.

关键词： magnesium alloy galvanic corrosion galvanic effect

galvanic　corrosion　BETWEEN　GRAPHITE　EPOXY　COMPOSITE　MATERIALS　AND　LY12CZ　ALUMINUM　ALLOY

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Acta Metallurgica Sinica(English Letters) 1996年第6期9卷 669-673页

作者： F.Lu W.Y.Shen J.G. Li and W.D. Zhen(Beijing Institute of Aeronautical Materials,Beijing 100095,) Beijing Inst of Aeronautical materials Beijing China

The electrochemical approach was used to show the nature of the galvanic corrosion when graphite epoxy composite materials(GECM)were coupled to LY12CZ aluminum alloy. An open circuit potential difference of one volt was obtained in 3.5% NaCl solution between GECM and LY12CZ. corrosion current data (zero impedance technique) indicated that there was serious corrosion at GECM/LY12CZ *** GECM/LY12CZ couples were exposed to ASTM salt spray and alternate immersion condition, fiber glass cloth and H06-2 epoxy primer paint were effective methods for preventing galvanic *** slow strain rate test (SSRT) showed that GECM increased the LY12CZ stress corrosion crack growth rate.

关键词： galvanic corrosion graphite epoxy composite materials

galvanic corrosion AND PROTECTION OF GECM/LY12CZ COUPLES UNDER DIFFERENT ATMOSPHERIC EXPOSURE CONDITIONS

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Acta Metallurgica Sinica(English Letters) 2003年第1期16卷 41-45页

作者： F.Lu Q.P.Zhong 等 BeijingInstituteofAeronauticalMaterials P.O.Box81－5Beijing100095China DepartmentofMaterialsScienceandEngineering BeijingUniversityofAeronauticsandAstronauticsBeijing100083China

galvanic, compatibility between graphite epoxy composite materials (GECM) and LY12CZ aluminum alloy was evaluated in different atmospheric corrosion environments and by laboratory electrochemical measurements. Open circuit potential electrochemical measurements showed a relatively large potential difference about 1 volt between the GECM and LY12CZ aluminum alloy, and this difference provided the driving force for galvanic corrosion of the LY12CZ aluminum alloy as an anode. Having been exposed for 1, 3 or 5 years in Beijing, Tuandao and Wanning station, GECM/LY12CZ couples showed significant losses of strength and elongation. Protective coatings and non-conductive barriers breaking the galvanic corrosion circuit were evaluated under the same atmospheric corrosive conditions. Epoxy primer paint, glass cloth barriers and LY12CZ anodizing were effective in galvanic corrosion control for GECM/LY12CZ couples.

关键词： galvanic corrosion graphite epoxy composite material atmospheric corrosion protection

galvanic corrosion Behaviour of HE 20 / MDN 138 ＆ HE 20 /MDN 250 Alloys in Natural Seawater

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Journal of Marine Science and Application 2016年第3期15卷 343-348页

作者： G. Subramanian G. T. Parthiban K. Muthuraman P. Ramakrishna rao Offshore Platform & Marine Electrochemistry Centre CSIR-CECRI Unit Harbour Area Tuticorin - 628004 India CSIR-Central Electrochemical Research Institute Karaikudi- 630003 India Defence Research Development Laboratory Hyderabad India

In view of their excellent mechanical properties, workability and heat treatment characteristics, MDN 138 & MDN 250 have been widely used in missile, rocket and aerospace industries. With light weight and high performance characteristics HE 20 aluminium alloy acts as an important material in defence and aerospace applications. The galvanic corrosion behaviour of the metal combinations HE 20 / MDN 138 and HE 20 / MDN 250, with 1:1 area ratio, has been studied in natural seawater using the open well facility of CECRI's Offshore Platform at Tuticorin for a year. The open circuit potentials of MDN 138, MDN 250 and HE 20 of the individual metal, the mixed potential and galvanic current of the couples HE 20 / MDN 138 and HE 20 / MDN 250 were periodically monitored throughout the study period. The calcareous deposits on MDN 138 and MDN 250 were analysed using XRD. The results of the study reveal that that HE 20 has offered required amount of protection to MDN 138 & MDN 250.

关键词： MDN 138 MDN 250 HE 20 galvanic corrosion natural seawater aluminium alloy

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)

Microstructure induced galvanic corrosion evolution of SAC305 solder alloys in simulated marine atmosphere

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Journal of Materials Science & Technology 2020年第16期47卷 40-53页

作者： Mingna Wang Chuang Qiao Xiaolin Jiang Long Hao Xiahe Liu Department of Physics Hebei Normal University of Science&TechnologyQinhuangdao 066004China School of Metallurgy Northeastern UniversityShenyang 110819China Environmental corrosion Centre of Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Material Science and Engineering University of Science and Technology of ChinaHefei 230026China

Motivated by the increasing use of Sn-3.0 Ag-0.5 Cu(SAC305)solder in electronics worked in marine atmospheric environment and the uneven distribution of Ag3Sn and Cu6Sn5 intermetallic compounds(IMCs)inβ-Sn matrix,comb-like electrodes have been designed for in-situ EIS measurements to study the microstructure induced galvanic corrosion evolution of SAC305 solder in simulated marine atmosphere with high-temperature and *** indicate that in-situ EIS measurement by comb-like electrodes is an effective method for corrosion evolution behavior study of SAC305 ***,the galvanic effect between Ag3Sn IMCs andβ-Sn matrix can aggravate the corrosion of both as-received and furnace-cooled SAC305 solder as the exposure time proceeds in spite of the presence of corrosion product *** corrosion can be preferentially found on furnace-cooled SAC305 with larger Ag3Sn grain ***,the generated inner stress during phases transformation process with Sn3O(OH)2Cl2 as an intermediate and the possible hydrogen evolution at local acidified sites are supposed to be responsible for the loose,porous,cracked,and non-adherent corrosion product *** findings clearly demonstrate the corrosion acceleration behavior and mechanism of SAC305 solder,and provide potential guidelines on maintenance of microelectronic devices for safe operation and longer in-service duration.

关键词： SAC305 solder Marine atmosphere galvanic corrosion In-situ EIS Comb-like electrode

Multi-physics analysis of the galvanic corrosion of Mg-steel couple under the influence of time-dependent anisotropic deposition film

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Journal of Magnesium and Alloys 2021年第3期9卷 866-882页

作者： Kai Wang Chenpei Li Yanhui Li Jinling Lu Yueshe Wang Xingqi Luo State Key Laboratory of Eco-hydraulics in Northwest Arid Region Xi'an University of TechnologyNo.5 Jinhua South RoadXi'an 710048China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityNo.28 Xianning West RoadXi'an 710049China

The anisotropic deposit film formed during the galvanic corrosion can impede the mass transfer of the involved species,thereby affecting the electro-chemical behavior and the evolution of galvanic *** limitations of experimental studies in the spatial-temporal scales restrict a deeper understanding of the corrosion mechanism,which can be complemented by numerical simulation.A multi-physics coupled model is proposed in this work to systematically investigate the temporal and spatial evolution of galvanic corrosion of the Mg-steel couple with the growing anisotropic deposition *** utilizing the multi-physics field coupled technique,various coupled physical-chemical processes underlying the corrosion behavior are built into the model,including chemical reactions,ionic mass transfer in the bulk solution and the deposition layer,interfacial reaction,deposition of corrosion products as well as the morphological transitions caused by metal dissolution and *** particular,the anisotropic deposit film is considered to be a porous layer with a porosity varying in time and space as the corrosion *** predicted corrosion morphology by this model is better than the previous *** coupled relationship between the electrochemical behavior(e.g.,electrode reaction kinetics,current density,surface potential)and the physical processes(e.g.,ionic transport,geometric evolution of metal surface and film interface)is *** results indicate that a porous deposition layer with a denser inner layer and a loose outer layer is generated,leading to more significant inhibition of mass transfer in the inner layer than the outer *** anisotropism of the deposition layer results in a non-uniform conductivity distribution and a discontinuous current density distribution in the *** current density on the electrode surface is inhibited by the deposition layer and the variation in the cathode/anode area ratio during the corrosion *** c

关键词： galvanic corrosion corrosion product film Modeling Mass transport Porosity

Initial micro-galvanic corrosion behavior between Mg_(2)Ca and α-Mg via quasi-in situ SEM approach and first-principles calculation

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Journal of Magnesium and Alloys 2023年第3期11卷 958-965页

作者： Chen Xu Jianfeng Wang Chen Chen Chao Wang Yufeng Sun Shijie Zhu Shaokang Guan School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

The initial micro-galvanic corrosion behavior of Mg-30wt%Ca alloy only containing Mg_(2)Ca andα-Mg was studied by immersion testing in a 0.9%Na Cl solution at 37°*** quasi-in situ SEM and TEM results show that Mg_(2)Ca corroded easier thanα-Mg,indicating that Mg_(2)Ca acted as an *** work function(Φ)for Mg_(2)Ca calculated by first-principles is significantly lower compared to that forα-*** Volta potential measured by a scanning Kelvin probe force microscope reveals that the Mg_(2)Ca had a relatively low Volta potential(ψ)*** lowerΦandψvalues for Mg_(2)Ca indicate a lower electrochemical nobility,which is consistent with the experimental phenomenon.

关键词： Magnesium alloy Quasi-in situ SEM galvanic corrosion First-principles calculations Work function Volta potential