Electrochemical corrosion behavior of 2A02 Al alloy under an accelerated simulation marine atmospheric environment

Cao, Min; Liu, Li; Yu, Zhongfen; Fan, Lei; Liu, Ying; Wang, Fuhui

doi:10.1016/j.jmst.2018.09.060

Cited by 88 publications

(24 citation statements)

References 33 publications

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“…In addition, with the increase of the corrosion time, the corrosion current density showed a trend of initial increase, decrease and then increase, generally, the corrosion rate was proportional to the corrosion current density. It can be seen from the above research results on the change of surface and cross-section corrosion morphology of the samples (Figures 3 and 4), the Al 2 O 3 passivation film on the surface of the 2A70 aluminum substrate was damaged due to Clerosion in the initial corrosion stage, this increased the corrosion current density and the corrosion rate increased rapidly, but the number and size of surface corrosion pits increased with increased corrosion time, the thickness of the surface corrosion product layer also gradually increases (Cao et al, 2019). The dense corrosion product layer prevents penetration of the corrosion medium, so the corrosion current density decreases.…”

Section: Electrochemical Analysis 321 Analysis Of Polarization Curvementioning

confidence: 97%

“…By the study of crack initiation, early crack growth dynamics and pitting transformation, a widespread fatigue damage model was established, allowing the formulation of a complete fatigue damage assessment system. The electrochemical results of Cao et al (2019) show decreased corrosion rate with the increase of corrosion time and a change in the corrosion product film from porous structure to dense structure. Akid (1998) studied the changes of surface deformation and electrochemistry for the process of corrosion and corrosion fatigue crack growth and concluded there was no simple linear relationship between stress and corrosion damage.…”

Section: Introductionmentioning

confidence: 96%

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Corrosion mechanism and fatigue behavior of 2A70-T6 aluminum alloy under alternating corrosion and fatigue

Lin

et al. 2021

ACMM

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Purpose Most supersonic aircraft were manufactured using 2A70 aluminum alloy. The purpose of this paper is to study the corrosion mechanism and fatigue behavior of an aircraft in a semi-industrial atmospheric corrosive environment, alternating effects of corrosion and fatigue were used to simulate the aircraft’s ground parking corrosion and air flight fatigue. Design/methodology/approach For this purpose, the aluminum alloy samples were subjected to pre-corrosion and alternating corrosion-fatigue experiments. The failure mechanisms of corrosion and corrosion fatigue were analyzed using microscopic characterization methods of electrochemical testing, X-ray diffraction and scanning electron microscopy. Miner’s linear cumulative damage rule was used to predict the fatigue life of aluminum alloy and to obtain its safe fatigue life. Findings The results showed that the corrosion damage caused by the corrosive environment was gradually connected by pitting pits to form denudation pits along grain boundaries. The deep excavation of chloride ions and the presence of intergranular copper-rich phases result in severe intergranular corrosion morphology. During cyclic loading, alternating hardening and softening occurred. The stress concentration caused by surface pitting pits and denudation pits initiated fatigue cracks at intergranular corrosion products. At the same time, the initiation of multiple fatigue crack sources was caused by the corrosion environment and the morphology of the transient fracture zone was also changed, but the crack propagation rate was not basically affected. The polarization curve and impedance analysis results showed that the corrosion rate increases first, decreases and then increases. Fatigue failure behavior was directly related to micro characteristics such as corrosion pits and microcracks. Originality/value In this research, alternating effects of corrosion and fatigue were used to simulate the aircraft’s ground parking corrosion and air flight fatigue. To study the corrosion mechanism and fatigue behavior of an aircraft in a semi-industrial atmospheric corrosive environment, the Miner’s linear cumulative damage rule was used to predict the fatigue life of aluminum alloy and to obtain its safe fatigue life.

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Section: Electrochemical Analysis 321 Analysis Of Polarization Curvementioning

confidence: 97%

Section: Introductionmentioning

confidence: 96%

Corrosion mechanism and fatigue behavior of 2A70-T6 aluminum alloy under alternating corrosion and fatigue

Lin

et al. 2021

ACMM

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“…The depressed semicircular shape of SS is attributed to the roughness of sample's surface. To fit the impedance spectrum of TiNbN/316L SS measured at OCP, an equivalent circuit with two constant phase elements (CPE), shown in Figure 8a [40], is adopted. The CPE is represented by Q.…”

Section: Corrosion Behaviormentioning

confidence: 99%

Corrosion Behavior and Conductivity of TiNb and TiNbN Coated Steel for Metallic Bipolar Plates

et al. 2019

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To improve corrosion resistance and electronic conductivity of bipolar plates for proton exchange membrane fuel cell (PEMFC), coatings of TiNb and TiNbN on 316L stainless steel (SS) were prepared by magnetron sputtering. X-ray diffraction (XRD) measurements confirmed the existence of metallic nitrides in the TiNbN coating. Scanning electron microscope (SEM) tests showed that the deposited coatings provided smooth surfaces. Further electrochemical measurements indicated that the corrosion resistance of TiNb coating was significantly higher than that of substrate. At 0.19 V vs MSE, the long-term stabilized current density of TiNb/316L SS was lower than 1 μA·cm−2. The interfacial contact resistance (ICR) values between coating and carbon paper suggested that TiNb and TiNbN films had better contact conductivity than 316L SS substrate. In conclusion, TiNb coated 316L SS metallic bipolar plate material is a promising option for PEMFC.

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“…The dissolution of carbon dioxide produces corrosive carbonic acid, and the hydrolysis of elemental sulfur causes the solution composition to become complex. Elemental sulfur, a yellow powder of S8, is an inorganic sediment generated by the catalytic pyrolysis product of ferrous sulfide under a high temperature and high pressure at the reservoir and deposited due to the reduction in temperature and pressure in the process of fluid production [5]. Zheng et al [6] proposed that high pressure and temperature were conducive to the formation of polysulfides.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Mechanism of L360 Pipeline Steel Coated with S8 in CO2-Cl− System at Different pH Values

Wang

et al. 2021

Metals

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The corrosion behavior of L360 pipeline steel coated with or without elemental sulfur (S8) in CO2–Cl− medium at different pH was studied. An autoclave was used to simulate the working conditions for forming the corrosion scale, and an electrochemical workstation with a three-electrode cell was used to analyze the electrochemical characterization of the corrosion scale. A wire beam electrode was used to determine the potential and current distribution, and scanning electron microscopy and X-ray diffraction were used to characterize the morphology and composition of the corrosion scale. The results showed that the deposition of S8 on the surface of the electrodes caused serious localized corrosion, especially under acidic conditions. The morphology and localized corrosion intensity index further proved that the deposition of S8 significantly promoted corrosion, especially pitting corrosion. Finally, a novel corrosion mechanism of L360 pipeline steel coated with S8 in a CO2-Cl− environment under acidic conditions was proposed, and we then modeled the theoretical mechanisms that explained the experimental results.

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Electrochemical corrosion behavior of 2A02 Al alloy under an accelerated simulation marine atmospheric environment

Cited by 88 publications

References 33 publications

Corrosion mechanism and fatigue behavior of 2A70-T6 aluminum alloy under alternating corrosion and fatigue

Corrosion mechanism and fatigue behavior of 2A70-T6 aluminum alloy under alternating corrosion and fatigue

Corrosion Behavior and Conductivity of TiNb and TiNbN Coated Steel for Metallic Bipolar Plates

Corrosion Mechanism of L360 Pipeline Steel Coated with S8 in CO2-Cl− System at Different pH Values

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