Corrosion behavior of the ζ-CrZn13 phase obtained by annealing an electrodeposited Zn-Cr coating

Chakarova, V.; Boiadjieva-Scherzer, Tz.; Kovacheva, Daniela; Kronberger, Hermann; Monev, M.

doi:10.1016/j.elecom.2020.106904

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…As a result, a new intermetallic compound CoZn13 (#00-029-0523) was registered. The latter is very similar in structure and properties to another intermetallic compound, CrZn13, which characterizes with well-expressed corrosion resistance [20]. A small amount of zinc is converted to zinc oxide (#PDF 01-071-3830).…”

Section: Phase Compositionmentioning

confidence: 99%

“…Titania-based nanosized coatings were prepared from titanium tetrabutoxide (TB, Alfa Aesar, Haverhill, MA, USA) dissolved in isopropanol and acetylacetone (0.4 M/L, Sigma Aldrich, Saint Louis, MO, USA). Afterwards, small quantity of polyoxyethylene (20) sorbitan monooleate (Tween 80, Sigma Aldrich, Saint Lous, MO, USA) was added under vigorous stirring for 1 h. As well-known, Tween 80 is a biodegradable surface modifier and has a remarkable effect on the reduction of the crystalline sizes. The substrates were dipped in the precursor solution and were withdrawn at a rate of 30 mm/min.…”

Section: Sample Typesmentioning

confidence: 99%

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Protective Characteristics of TiO2 Sol-Gel Layer Deposited on Zn-Ni or Zn-Co Substrates

et al. 2023

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This study aimed to present the differences in the corrosion properties and protective ability of two bi-layer systems obtained on low-carbon steel in a model corrosive medium of 5% NaCl solution. These newly developed systems consist of Zn-Co (3 wt.%) or Zn-Ni (10 wt.%) alloy coatings as under-layers and a very thin TiO2 sol-gel film as a top-layer. Scanning electron microscopy (SEM) is used for characterization of the surface morphology of the samples indicating that some quantitative differences appear as a result of the different composition of both zinc alloys. Surface topography is investigated by means of atomic force microscopy (AFM), and the hydrophobic properties are studied by contact angle (CA) measurements. These investigations demonstrate that both sample types possess grain nanometric surface morphology and that the contact angle decreases very slightly. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) are used for characterization of the chemical composition and electronic structure of the samples. The roughness Rq of the Zn-Ni/TiO2 is 49.5 nm, while for Zn-Co/TiO2, the Rq value is 53.4 nm. The water contact angels are 93.2 and 95.5 for the Zn-Ni/TiO2 and Zn-Co/TiO2 systems, respectively. These investigations also show that the co-deposition of Zn and Ni forms a coating consisting entirely of Ni2Zn11, while the other alloy contains Zn, Co and the intermetallic compound CoZn13. The corrosion resistance and protective ability are estimated by potentiodynamic polarization (PDP) curves, as well as polarization resistance (Rp) measurements for a prolonged test period (35 days). The results obtained are compared with the corrosion characteristics of ordinary zinc coating with an equal thickness. The experimental data presents the positive influence of the newly developed systems on the enhanced protective properties of low-carbon steel in a test environment causing a localized corrosion—lower corrosion current density of about one magnitude of order (~10−6 A.cm−2 for both systems and ~10−5 A.cm−2 for Zn) and an enhanced protective ability after 35 days (~10,000–17,000 ohms for the systems and ~900 ohms for Zn).

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Section: Phase Compositionmentioning

confidence: 99%

Section: Sample Typesmentioning

confidence: 99%

Protective Characteristics of TiO2 Sol-Gel Layer Deposited on Zn-Ni or Zn-Co Substrates

et al. 2023

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Electrogalvanizing processes (EG coatings)

Marder¹,

Goodwin²

2023

The Metallurgy of Zinc Coated Steels

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Corrosion Efficiency of Zn-Ni/ZrO2 and Zn-Co/ZrO2 Bi-Layer Systems: Impact of Zn-Alloy Sublayer Thickness

Boshkova,

Stoyanova,

Stambolova

et al. 2024

Coatings

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The presented manuscript demonstrates the effect of the thickness of a zinc alloy sublayer on the corrosion resistance and stability of three types of bi-layer systems composed of Co- or Ni-modified zinc coatings (both as sublayers) and a top sol–gel ZrO2 film in a 5% NaCl solution. In order to obtain more detailed information, the alloy sublayers were electrodeposited with three different thicknesses (1, 5 and 10 µm, respectively) on a low-carbon steel substrate. Three consecutive dip-coated ZrO2 sol–gel layers were deposited thereafter on the individual zinc alloy sublayers. For comparison, an ordinary electrodeposited zinc coating was obtained and investigated. The aim of this study was to evaluate the effect of the thickness of the zinc-based sublayer on the protective characteristics of the bi-layer systems. The surface morphology features and the phase composition of the latter systems were examined using scanning electron microscopy (SEM), atomic force microscopy (AFM), water contact angle (WCA) measurements and X-ray diffraction (XRD) analyses. The corrosion stability was evaluated by means of potentiodynamic polarization (PDP) curves and polarization resistance (Rp) measurements. The zirconia finish layers possessed an amorphous, dense and hydrophobic nature, while the sublayers were multicrystalline. The results confirmed the increased corrosion resistance of the protective system, which contained the electrodeposited layer on the Zn-Co alloy with a 10 µm thickness in a corrosive test medium.

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Corrosion behavior of the ζ-CrZn13 phase obtained by annealing an electrodeposited Zn-Cr coating

Cited by 3 publications

References 4 publications

Protective Characteristics of TiO2 Sol-Gel Layer Deposited on Zn-Ni or Zn-Co Substrates

Protective Characteristics of TiO2 Sol-Gel Layer Deposited on Zn-Ni or Zn-Co Substrates

Electrogalvanizing processes (EG coatings)

Corrosion Efficiency of Zn-Ni/ZrO2 and Zn-Co/ZrO2 Bi-Layer Systems: Impact of Zn-Alloy Sublayer Thickness

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