Enhancement corrosion resistance of Mg Al layered double hydroxides films by anion-exchange mechanism on magnesium alloys

Hou, Lifeng; Li, Yulin; Sun, Junli; Zhang, Shao Hua; Wei, Huan; Wei, Yinghui

doi:10.1016/j.apsusc.2019.05.048

Cited by 79 publications

(30 citation statements)

References 52 publications

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“…After the in situ growth of LDH coating on the laser-treated surface, the value increased to −1.214 V. Moreover, after adding OTS as a surface organic modifier, the E corr value even increased to −0.876 V. In addition, as for i corr , the values tended to a lower position with the overlay of processing methods. Especially, the i corr value went to 1.08 × 10 –10 A/cm 2 when the substrate was covered by L-LDHs-OTS composite coating, which decreased by 5 orders of magnitude compared with that of the Mg alloy substrate (Table S1), indicating that the L-LDHs-OTS coating exhibited good corrosion protection and was superior to all of the LDH anticorrosive coatings shown in Table S2. ,, Much tooth fluctuation in the anode branch could be seen in the polarization curves of the L-LDHs and L-LDHs-OTS, which was the process of repeated breaking, passivation, and bluntness, proving that the LDH coating was self-healing …”

Section: Results and Discussionmentioning

confidence: 95%

“…Especially, the i corr value went to 1.08 × 10 −10 A/cm 2 when the substrate was covered by L-LDHs-OTS composite coating, which decreased by 5 orders of magnitude compared with that of the Mg alloy substrate (Table S1), indicating that the L-LDHs-OTS coating exhibited good corrosion protection and was superior to all of the LDH anticorrosive coatings shown in Table S2. 16,37,38 Much tooth fluctuation in the anode branch could be seen in the polarization curves of the L-LDHs and L-LDHs-OTS, which was the process of repeated breaking, passivation, and bluntness, proving that the LDH coating was self-healing. 37 39 From Figure 6b,c, it could be seen that, after coating by LDH coating, the capacitive arc diameter was increased by about 4 orders of magnitude.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…16,37,38 Much tooth fluctuation in the anode branch could be seen in the polarization curves of the L-LDHs and L-LDHs-OTS, which was the process of repeated breaking, passivation, and bluntness, proving that the LDH coating was self-healing. 37 39 From Figure 6b,c, it could be seen that, after coating by LDH coating, the capacitive arc diameter was increased by about 4 orders of magnitude. Also, compared with that of L-LDHs, the capacitive arc diameter of L-LDHs-OTS was increased by about 1 order of magnitude and reached the order of 10 7 , indicating that the anti-corrosion performance had been improved a lot.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Superhydrophobic and Self-Healing Mg-Al Layered Double Hydroxide/Silane Composite Coatings on the Mg Alloy Surface with a Long-Term Anti-corrosion Lifetime

et al. 2021

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Both a superhydrophobic structure and layered double hydroxide (LDH) coating were effective to improve the corrosion resistance of alloys. In this study, a superhydrophobic composite coating based on LDHs was constructed on Mg alloy by laser treatment, in situ growth of Mg-Al LDHs, and modification with octadecyl-trimethoxy-silane (OTS). The so-obtained composite coating was coded as L-LDHs-OTS, where L stands for laser treatment. Results showed that the L-LDHs-OTS composite coating presented the best anti-corrosion performance and the corrosion current density was reduced by about 5 orders of magnitude compared with that of the Mg alloy substrate. The excellent corrosion resistance was related to the superhydrophobicity of the composite coating, the compactness and ion-exchange capacity of the LDH layer, and the dense Si-O-Si network within the OTS layer. Moreover, the L-LDHs-OTS composite coating was still effective after 20 days of immersion tests, showing good long-term corrosion resistance due to the existence of hydrophobicity of the composite coating and the self-healing ability of LDHs.

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Section: Results and Discussionmentioning

confidence: 95%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

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Superhydrophobic and Self-Healing Mg-Al Layered Double Hydroxide/Silane Composite Coatings on the Mg Alloy Surface with a Long-Term Anti-corrosion Lifetime

et al. 2021

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“…Because the degree of chloride removal from the solution containing the iron alloy specimen is an indicator of corrosion protection, the equivalent circuit model constants in Figure 9D were applied. In the equivalent circuit model, iron alloys are considered to have a porous structure and exhibit capacitive behavior (Hou et al, 2019;Imanieh and Afshar, 2019;Liu et al, 2019;Xu et al, 2020). The relevant parameters are listed in Table 6, where R s denotes the electrolyte resistance, R f denotes the electrolyte resistance inside the pores, C f represents the film capacitance, R ct represents the charge transfer resistance of the electrochemical processes occurring inside the pores, and C dl denotes the double-layer capacitance.…”

Section: Ldhsmentioning

confidence: 99%

CaFe-Based Layered Double Oxides With Superior Iron Alloy Corrosion Inhibition Behaviors in Aggressive Seawater Environment

Park

Yoo²,

Cho

et al. 2022

Front. Chem.

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Reinforced concrete is among the most multifaceted materials used in the construction field. Maintaining the resistance of reinforced concrete to weathering, abrasion, and chemical attack, particularly in aggressive natural conditions such as seawater environments, is challenging. The main factor in the degradation of reinforced-concrete durability is chloride penetration, which accelerates iron alloy corrosion and facilitates structural degradation. In this study, calcium-iron-based layered double hydroxides (CaFe-LDHs) were fabricated at room temperature, followed by structural modulation, and their effectiveness in mitigating iron alloy corrosion due to chloride ions (in 3.5 wt% of NaCl) was investigated. The synthesized CaFe-LDHs with phase transfer notably improved the Cl− removal capacity (Qmax) to 881.83 mg/g, which is more than three times that reported based on previous studies. The novelty of this research lies in the sophisticated structural and phase transformations of the as-synthesized CaFe-LDHs, determination of crucial factors for chloride ion removal, and suggestion of calcium-iron-based layered double oxide (CaFe-LDO)-based chloride ion removal mechanisms considering chemical and ion-exchange reactions. Moreover, when the phase-transformed LDHs, C-700 LDOs, were applied to inhibit iron alloy corrosion, a noticeable inhibition efficiency of 98.87% was obtained, which was an 11-fold improvement compared to the case of iron alloys without LDOs. We believe this work can provide new insights into the design of CaFe-LDOs for the enhancement of the lifespan of reinforced concrete structures.

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“…The mechanism of the inhibitory action of DLH, such as mechanical actuation, damage to the capsule shell because of changes in pH or temperature, as well as the process of ion exchange, has recently been actively discussed (Hou et al , 2019; Wu et al , 2019; Cao et al , 2017). The mechanism of anion exchange is preferred and is because of the absorption of chloride ions and the release of inhibitory ions (Miao et al , 2018).…”

Section: Introductionmentioning

confidence: 99%

Investigation of color and anticorrosive properties of pigments in the Fe-Al-Mg-O-H system by the simplex lattice method

Frolovа

Butyrina

2020

PRT

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Purpose The purpose of this paper is to study the patterns of formation of anti-corrosion properties, the development of compositions for pigments by using the method of co-precipitation and subsequent heat treatment. Design/methodology/approach To obtain co-precipitated hydroxides, aqueous solutions of salts were used. The conditions of synthesis varied according to the following parameters: the nature of the starting salts of metals; and the ratio of metal cations. The anticorrosive activity of the pigments was evaluated by the potentiodynamic method, by comparing the anodic and cathodic polarization curves, and calculated potentials and corrosion currents on the basis of regions of Tafel on curves. Polarization curves were obtained by using Potentiostat/Galvanostat/ZRA Gamry, which connected to the PC, and by using the program Gamry Framework. The measurement results were processed by using the method of simplex-lattice planning. X-ray diffractograms of pigments were recorded on a DRON – 2.0 diffractometer (monochromatic copper radiation with a nickel filter). Findings The paper deals with the results of research the dependence of colour characteristics and anticorrosion properties of synthesized compositions on their nature and composition. The presence of aluminium cations leads to the formation of solid solutions of ferrum and aluminium oxyhydroxides. Originality/value The main technological properties of pigments are determined by the anionic and cationic composition. Colour characteristics are determined by the cation-chromophore. The anti-corrosive properties of non-calcined pigments are determined to a greater extent by the presence of the formed hydroxyl ions and the composition of the compounds. The greatest protective effect is observed when using double compounds of metals, the dissociation constants of which differ significantly. The protective effect is mainly determined by the slowdown of the anode process. Anions containing aluminium atoms accelerate the corrosion processes.

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Enhancement corrosion resistance of Mg Al layered double hydroxides films by anion-exchange mechanism on magnesium alloys

Cited by 79 publications

References 52 publications

Superhydrophobic and Self-Healing Mg-Al Layered Double Hydroxide/Silane Composite Coatings on the Mg Alloy Surface with a Long-Term Anti-corrosion Lifetime

Superhydrophobic and Self-Healing Mg-Al Layered Double Hydroxide/Silane Composite Coatings on the Mg Alloy Surface with a Long-Term Anti-corrosion Lifetime

CaFe-Based Layered Double Oxides With Superior Iron Alloy Corrosion Inhibition Behaviors in Aggressive Seawater Environment

Investigation of color and anticorrosive properties of pigments in the Fe-Al-Mg-O-H system by the simplex lattice method

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