Correlation of Microstructure with Corrosion and Electrochemical Behavior of the Batch-Type Hot-Dip Al-Zn Coatings: Part I. Zn and 5%Al-Zn Coatings

Lin, Kwang Lung; Yang, Chih-han; Lee, J.-T.

doi:10.5006/1.3585224

Cited by 26 publications

(7 citation statements)

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“…Zinc electrodeposits are of practical and industrial importance due to their proven ability to protect ferrous substrates against corrosion [1][2][3][4][5]. Diverse factors influence the mechanism of zinc electrodeposition, including the morphology of the coating that is formed.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and AFM study of Zn electrodeposition in the presence of benzylideneacetone in a chloride-based acidic bath

et al. 2005

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The influence of benzylideneacetone (BDA) on the mechanism of zinc deposition and nucleation was studied by voltammetry, chronoamperometry and atomic force microscopy (AFM). The addition of BDA to the electrolyte solution partially inhibited (97%) the reduction of zinc at the potential E ¼ )1.15 vs SCE/V, giving rise to an increase in the overpotential for the discharge of the metal ion. This leads to the existence of two reduction processes with different energies that involve the same species, ZnCl 2À 4 . Analysis of chronoamperograms obtained in the absence and presence of BDA indicates that distinct nucleation mechanisms are involved during the initial stages of Zn deposition. In the absence of BDA, the transients are consistent with the model of 3D diffusion-controlled nucleation. In the presence of BDA, the transients exhibit a more complex form involving two growth processes. The first process, which occurs at short times, is explained in terms of a combination of three simultaneous nucleation processes: 2D progressive, 2D instantaneous, and 3D progressive nucleation, each limited by the incorporation of adatoms. The second process, which occurs at longer times, involves the three processes that occur at short times in conjunction with a principal contribution from a diffusion-controlled 3D nucleation mechanism. AFM imaging shows that the morphology of the deposited zinc depends on the applied electrode potential.

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Section: Introductionmentioning

confidence: 99%

Electrochemical and AFM study of Zn electrodeposition in the presence of benzylideneacetone in a chloride-based acidic bath

et al. 2005

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“…Zinc coatings provide the most effective and economical way of protecting steel against corrosion. The Zn‐coated materials are characterized by higher corrosion resistance in aggressive environment . Corrosion resistance of coatings can also be improved by using zinc alloy coatings.…”

Section: Introductionmentioning

confidence: 99%

Surface analysis and corrosion resistance of new nickel base thin film alloys

Popescu

Neacsu

Yanushkevich³

2014

Surface & Interface Analysis

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Electroless Zn-Ni-P thin films were deposited on low carbon steel from an alkaline non-cyanide aqueous electrolyte. The newly developed ternary alloys structure and microstructure investigations were carried out via X-ray diffraction and SEM. Chemical composition of the coatings was investigated via energy dispersive spectroscopy. Polarization tests were used to study the corrosion properties of the coatings in a 3.5 wt.% NaCl solution. The results confirmed the high corrosion resistance of Zn-Ni-P alloy plated steel sheet. The surface analysis of the thin film samples before and after corrosion was performed by XPS. The incorporation of Zn in Ni-P thin film is proven for all initial samples to be as a mixture of zinc and zinc oxide, while nickel exists in +2 and +3 oxidized states. A passive film of a mixture of oxide and hydroxide of zinc and nickel forms on the surface and prevents the Zn-Ni-P thin films from corrosion.

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“…The pH value of the suspension was about 5.0-5.6. The deposition was carried out in the vessel (V = 600 cm 3 , φ = 9 cm) containing 400 cm 3 of the bath with mechanical stirring (200 rpm) to keep the Ni powder in suspension. The temperature of the bath during deposition was 293 K.…”

Section: Methodsmentioning

confidence: 99%

Electrodeposition and the properties of composite Zn + Ni coatings

Panek

Bierska-Piech

Łągiewka

et al. 2010

Surface & Interface Analysis

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Composite Zn + Ni coatings were obtained by electrodeposition of Zn with Ni particles on a steel substrate from a zinc chloride based electrolyte in which metallic Ni powder was suspended by mechanical stirring. The deposition was carried out under galvanostatic conditions. The effect of the metal powder amount in the bath, as well as the deposition current density, on the content of incorporated Ni particles in the coatings was investigated. The deposits have been characterized by the presence of Ni particles embedded into the crystalline Zn matrix. The mechanism of metallic particles' embedding was explained on the base of Zn 2+ ions adsorption process. The surface morphology of the obtained coatings was investigated by SEM method.The deposited composite coatings were subjected to the thermal treatment in order to carry out the reaction in the solid state between the zinc matrix and incorporated Ni particles and to reach the better homogeneity of the examined material.The corrosion resistance properties of Zn and Zn + Ni coatings in 5% NaCl solution were compared by examining the results acquired through Stern method and electrochemical scanning methods. The corrosion potential E corr , corrosion current density i corr and polarization resistance R p have been determined, as a measure of corrosion resistance.

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Correlation of Microstructure with Corrosion and Electrochemical Behavior of the Batch-Type Hot-Dip Al-Zn Coatings: Part I. Zn and 5%Al-Zn Coatings

Cited by 26 publications

References 0 publications

Electrochemical and AFM study of Zn electrodeposition in the presence of benzylideneacetone in a chloride-based acidic bath

Electrochemical and AFM study of Zn electrodeposition in the presence of benzylideneacetone in a chloride-based acidic bath

Surface analysis and corrosion resistance of new nickel base thin film alloys

Electrodeposition and the properties of composite Zn + Ni coatings

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