Microstructure Characterization and Corrosion Resistance of Zinc Coating Obtained in a Zn-AlNiBi Galvanizing Bath

Kania, H.; Saternus, M.; Kudláček, Jan; Svoboda, Jakub

doi:10.3390/coatings10080758

Cited by 17 publications

(23 citation statements)

References 21 publications

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“…The cathodic part of the polarization curves again indicated that the corrosion process was under mixed activation-diffusion control, as it was concluded from the impedance spectroscopy. The anodic curves were not related to passivation, and the values of the anodic Tafel slope (50 mV dec -1 ) were in correlation with literature data for zinc-based coatings in NaCl solution 21,28,29 .…”

Section: Corrosion Resistancesupporting

confidence: 86%

Hardness and corrosion resistance of Zn−Mn/Al2O3 composite coatings produced by electrochemical deposition

2022

IJEMS

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The aim of this study is development and characterization of the novel Zn-Mn/Al 2 O 3 composite coatings. The coatings were electrodeposited with constant current density on steel, from chloride solution, without any commercial additives. The Zn−Mn alloy coatings that show high corrosion resistance, may be used in future as an alternative to cadmium coatings. However, the pure Zn and Zn alloy coatings are characterized with poor mechanical properties. Therefore, in this work the alumina particles were incorporated into the Zn-Mn matrix, and the hardness and corrosion resistance of the obtained composite coatings were tested. The mechanical and ultrasound agitation were used to achieve good dispersion of plating solution and homogeneous co-deposition of second phase. The goal was to examine the effect of the agitation type in bath, on the attributes of the deposited composite coatings. The incorporation of Al 2 O 3 particles was enhanced when the mechanical agitation of the solution was applied. However, in case that this agitation method was used, the agglomeration of the alumina particles occurred. In contrast, when an ultrasonic agitation of the plating solution was applied, the uniform distribution of the alumina particles could be achieved. The presence of particles in the matrix, along with applied ultrasound, resulted in grain refinement and homogeneous microstructure. The Al 2 O 3 nanoparticles incorporated in Zn-Mn alloy matrix, resulted in a significant increment in the indentation hardness and a modest increase in the coating corrosion resistance. However, the coating hardness increased with alumina addition, only in case when an ultrasonic agitation of the electrodeposition solution was used.

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Section: Corrosion Resistancesupporting

confidence: 86%

Hardness and corrosion resistance of Zn−Mn/Al2O3 composite coatings produced by electrochemical deposition

2022

IJEMS

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“…This work presents the results of a detailed theoretical analysis of zinc coatings based on grazing incidence X-ray diffraction technique. The samples grown using the hot-dip galvanizing process [1][2][3][4]8,13,14,16,[18][19][20], chemical vapor deposition by pack cementation [5][6][7][8]13,14,16,[21][22][23][24][25] and wire flame thermal spray [9][10][11][12][13][14]16,[26][27][28] were examined using scanning electron microscopy (SEM), Bragg-Brentano and grazing incidence XRD, with specific interest in the composition of the thin zinc oxide layer formed on the surface. The X-rays theoretical penetration depth for all three types of sample was also calculated and compared to the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Application of X-rays Diffraction for Identifying Thin Oxide Surface Layers on Zinc Coatings

Vourlias

2020

Coatings

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Structural characterization of compound material coatings is usually achieved using time-consuming and destructive techniques such as optical and electrical microscopy, which require the use of grinding processes not always compatible with the material. This paper reports on the effective use of a theoretical model based on X-ray diffraction to calculate the thickness and composition of thin oxide films formed on the surface of zinc coatings. Zinc coatings are widely used in industrial application as protective layers against the atmospheric corrosion of steel substrates. The thickness of single- and multi-layer coatings is estimated using grazing incidence X-ray diffraction and various incidence angles. The coatings were grown using hot-dip, pack cementation and thermal spray techniques, and their experimental characteristics were compared to the theoretically predicted values of thickness and composition. The results indicate the formation of a thin zinc oxide film on top of each coating, which acts as an isolation layer and protects the surface of the sample against the environmental corrosion. Finally, the penetration depth of the X-rays into the zinc-based coatings for grazing incidence and Bragg–Brentano X-ray diffraction geometries were calculated using theoretical equations and experimentally confirmed.

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“…The Zn galvanizing process is widely investigated, and new regimes with respect to galvanizing temperature or/and chemistry of bath are proposed with respect of their functionality. Kania et al [ 6 ] reported the negative influence of Bi added to a Zn bath on the corrosion resistance due to the presence of Bi precipitates. Li et al [ 7 ] remarkably improved the adhesion of Zn coating after the cold galvanizing by the use of γ-chloropropyl triethoxysilane.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Measurement of Zn Layer Heterogeneity on the Flange of the Steel Road Barrier

et al. 2022

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This study deals with monitoring of Zn layer heterogeneity on the flange of steel road barriers using magnetic measurements. The Barkhausen noise technique is employed for such purpose, and parameters extracted from Barkhausen noise signals are correlated with the true thickness of the Zn layer. The true values of the Zn layer were obtained from the metallographic images, as well as the thickness gauge CM-8825FN (Guangzhou Landtek Instruments Co. Ltd., Guangzhou, China) device. It was observed that the diffusion region lies below the Zn protective layer, which makes the thickness of the Zn layer obtained from the CM-8825FN device thicker than that measured on the metallographic images. For this reason, the chemical gradient of Zn below the Zn layer can be reported, and it affects Barkhausen noise emission. Barkhausen noise decreases along with increasing thickness of the Zn layer, and Barkhausen noise envelopes are shifted to stronger magnetic fields. The number of strong MBN pulses drops down with the increasing thickness of Zn coating at the expense of the increasing number of the weak MBN pulses. The thickness of Zn coating can be polluted by the solidification of Zn melt after galvanizing. The presence of the diffusion layer dims the contrast between ferromagnetic and paramagnetic phases.

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Microstructure Characterization and Corrosion Resistance of Zinc Coating Obtained in a Zn-AlNiBi Galvanizing Bath

Cited by 17 publications

References 21 publications

Hardness and corrosion resistance of Zn−Mn/Al2O3 composite coatings produced by electrochemical deposition

Hardness and corrosion resistance of Zn−Mn/Al2O3 composite coatings produced by electrochemical deposition

Application of X-rays Diffraction for Identifying Thin Oxide Surface Layers on Zinc Coatings

Magnetic Measurement of Zn Layer Heterogeneity on the Flange of the Steel Road Barrier

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