Electrochemical corrosion behavior of nanocrystalline zinc coatings in 3.5% NaCl solutions

Li, Moucheng; Li, Jiang; Zhang, Wen Qi; Qian, Yu Hai; Luo, Suzhen; Shen, Jiale

doi:10.1007/s10008-007-0293-5

Cited by 80 publications

(40 citation statements)

References 39 publications

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“…The circuit as shown in Fig. 8(a) consists of parameters namely solution resistance (R s ), inductance resistance (R L ), inductance (L), charge transfer resistance (R ct ) and a constant phase element (CPE) which replaces the capacitance of the double layer (C dl ) due to the roughness and inhomogeneity of the electrode surface [26]. The circuit, shown in Fig.…”

Section: Specimensmentioning

confidence: 99%

Corrosion resistance and mechanical properties of pulse electrodeposited Ni–TiO2 composite coating for sintered NdFeB magnet

Yang

Zhang

et al. 2009

Journal of Alloys and Compounds

125

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Section: Specimensmentioning

confidence: 99%

Corrosion resistance and mechanical properties of pulse electrodeposited Ni–TiO2 composite coating for sintered NdFeB magnet

Yang

Zhang

et al. 2009

Journal of Alloys and Compounds

125

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“…But in most cases, combinations of different additives gave satisfactory deposit. The suitable combination of two or more additives improves the appearance and corrosion resistance of deposit as well as the throwing power and current efficiency of the bath solution compare to single additive [23][24][25].…”

Section: Introductionmentioning

confidence: 97%

Synergistic effects of additives on morphology, texture and discharge mechanism of zinc during electrodeposition

Nayana

Venkatesha

2011

Journal of Electroanalytical Chemistry

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“…The manifestation of apparent passivity (even if shortterm) on pure Mg extends beyond the present thermodynamics understandings based on Pourbaix diagrams, and adds to the findings slowly accumulating in the literature (for example [3][4][5][6][11][12] ) that it is possible to modify corrosion kinetics simply by microstructural changes in the bulk or a near-surface region, without any changes in composition. This statement is a corollary of the present results for magnesium, which have demonstrated that electrochemical response can be controlled through microstructural variations alone.…”

mentioning

confidence: 99%

Corrosion of Pure Mg as a Function of Grain Size and Processing Route

2008

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The precise effect of grain size on corrosion at a fundamental level is not widely understood. In this work we will focus solely on the corrosion of magnesium of 99.9 % purity, in order to address a critical fundamental knowledge gap in the assessment of Mg corrosion as a function of grain size. This is of a critical importance as corrosion susceptibility for a given environment is commonly interpreted in terms of Pourbaix diagrams, [1] which do not account for the effect of any microstructure parameters, such as grain size. Furthermore they tell us nothing about the rate at which Mg may corrode in the active region. With regards to Mg, the oxide layer is not stable in aqueous solutions owing to high compression stresses within the oxide layer (geometrical mismatch with respect to the hexagonal Mg lattice), which cause cracks. [2] One possible way of compensating for this effect is by deliberately introducing a large volume fraction of grain boundaries in the bulk material and diminishing the mismatch. However, it is unknown if the oxide that forms on such boundary regions in Mg will have better coherency and if this will be manifest in the corrosion response. Also, the development of advanced casting methods for Mg alloys leading to thin sections below 1 mm translates to an urgent need to study the effect of grain size on corrosion to ensure the integrity of such components or at least understand the factors which control it. We would like to emphasise that there is a lack of literature on purely microstructural effects on corrosion, particularly in the absence of alloying elements. If the effects of chemistry could be isolated and the grain structure varied, then potentially the effect of grain size on corrosion could be determined. Some relevant prior works however have indicated that a decrease in the grain size improves corrosion resistance for c-stainless steel, and was found to reduce the localized effects of corrosion such that both intergranular corrosion rate and pitting were reduced. [3] Corrosion resistance also increased with decreasing grain size in zirconium at high temperature when nanocrystalline grains were compared to coarse grains. [4] It was further found that corrosion morphology was altered as polycrystalline Cu was grain refined by equal channel angular pressing, [5] whilst corrosion reduction was also demonstrated for IF steel. [6] In the present study a cast ingot of pure magnesium (99.9 %) was used as the initial material for the work. Specimens were then prepared for the study using a variety of mechanical or thermo-mechanical processes and annealed at 250°C in a potassium sulphate salt-bath with specimens packaged in Al foil, in order to obtain a variation in grain size. A range of grain sizes was produced by processing the as-cast specimens using Surface Mechanical Attrition Treatment (SMAT) and the Equal Channel Angular Pressing (ECAP). ECAP is a severe plastic deformation technique that results in grain refinement of the bulk of a material by pressing it through an angular die (ty...

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Electrochemical corrosion behavior of nanocrystalline zinc coatings in 3.5% NaCl solutions

Cited by 80 publications

References 39 publications

Corrosion resistance and mechanical properties of pulse electrodeposited Ni–TiO2 composite coating for sintered NdFeB magnet

Corrosion resistance and mechanical properties of pulse electrodeposited Ni–TiO2 composite coating for sintered NdFeB magnet

Synergistic effects of additives on morphology, texture and discharge mechanism of zinc during electrodeposition

Corrosion of Pure Mg as a Function of Grain Size and Processing Route

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