Structural and Textural Characterization of the Substrate and Coated Layer in an Industrial Galvannealed Interstitial-Free Steel

Chakraborty, Anindita; Ray, R.K.; Sangal, S.

doi:10.1007/s11661-008-9589-z

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…A structural study of TDZ coatings has shown that the δ-phase on their surface could have various crystallographic textures [6]. Thus, for relatively thick coatings (>30 μm) the δ-phase is characterized by the absence of texture, whereas the inner layer of the coating has a texture, characterized by the hexagonal axis of the δ-phase directed parallel to the plane of the coating, which is typical for the δ-phase obtained after annealing hot-dip zinc coatings [7,8]. It is known that texture could be an important factor which influences the coating properties.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Biryukov¹,

Galin²,

Zakharyevich³

et al. 2019

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A LAYER-BY-LAYER ANALYSIS OF THE CORROSION PROPERTIES OF DIFFUSION ZINC COATINGSTo obtain anti-corrosive thermo-diffusion zinc coatings, the authors use highly effective zinc saturating mixtures. This technology makes it possible to obtain coatings with a high zinc content in the δ-phase as well as a zinc-rich phase of FeZn 13 (ζ-phase) on the coating surface. As a result of long-term studies into the corrosion properties of thermo-diffusion zinc (TDZ) coatings conducted by the authors, a number of features of their corrosive behavior have been established. The corrosion rate of those coatings in desalted and chloride-containing media is lower than those of galvanic or hot-dip zinc coatings. The corrosion behavior depends on the content of zinc on the surface and the texture features of the coating. The results showed that on the surface of thermo-diffusion coatings in the corrosion on media containing chloride ions, zinc hydroxychloride (simonkolleite -Zn 5 Cl 2 [OH] 8 [H 2 O]) has been formed. Compared to coatings obtained by other methods, the rate of simonkolleite formation was higher on TDZ coatings, which might have a positive effect on their resistance in aggressive atmospheres.

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Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Biryukov¹,

Galin²,

Zakharyevich³

et al. 2019

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“…In addition, effects of microstructure, texture, intermetallic phases, coating composition, and post-treatments on the mechanical and corrosion properties of the galvannealed automotive steels have been widely investigated. [1][2][3][4][5][6][7][8][9][10][11][12] However, undesirable Mn and Si oxides may be formed on the surface of DP and TRIP steels during the annealing process in a reducing atmosphere, due to their high contents of Mn and Si. [13][14][15][16] The Mn and Si oxides have low wettability with the zinc coating and induce the formation of surface defects, such as craters, on the final galvannealed steel product.…”

Section: Introductionmentioning

confidence: 99%

Surface Oxidation of the High-Strength Steels Electrodeposited with Cu or Fe and the Resultant Defect Formation in Their Coating during the Following Galvanizing and Galvannealing Processes

Choi

Beom

Park

et al. 2010

Metall Mater Trans A

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This study examined the surface oxidation of high-strength steels electrodeposited with Cu or Fe and the resultant defect formation in their coating during the following galvanizing and galvannealing processes. The high-strength steels were coated with an Cu or Fe layer by the electroplating method. Then, the coated steels were annealed in a reducing atmosphere, dipped in a molten zinc, and finally transformed into galvannealed steels through the galvannealing process. The formation of Si and Mn oxides on the surface of the high-strength steel was effectively suppressed, and the density of surface defects on the galvanized steel was significantly reduced by the pre-electrodeposition of Cu and Fe. This effect was more prominent for the steels electrodeposited at higher cathodic current densities. The finer electrodeposit layer formed at higher cathodic current density on the steels enabled the suppression of partial surface oxidation by Mn or Si and better wetting of Zn on the surface of the steels in the following galvanizing process. Furthermore, the pre-electrodeposited steels exhibited a smoother surface without surface cracks after the galvannealing process compared with the untreated steel. The diffusion of Fe and Zn in the Zn coating layer in the pre-electrodeposited steels appears to occur more uniformly during the galvannealing process due to the low density of surface defects induced by oxides.

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X-ray diffraction and scanning electron microscopy of galvannealed coatings on steel

Uran

Macherey

et al. 2009

Anal Bioanal Chem

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The formation of Fe-Zn intermetallic compounds, as relevant in the commercial product galvannealed steel sheet, was investigated by scanning electron microscopy and different methods of X-ray diffraction. A scanning electron microscope with high resolution was applied to investigate the layers of the galvannealed coating and its topography. Grazing incidence X-ray diffraction (GID) was preferred over conventional Bragg-Brentano geometry for analysing thin crystalline layers because of its lower incidence angle alpha and its lower depth of information. Furthermore, in situ experiments at an environmental scanning electron microscope (ESEM) with an internal heating plate and at an X-ray diffractometer equipped with a high-temperature chamber were carried out. Thus, it was possible to investigate the phase evolution during heat treatment by X-ray diffraction and to display the growth of the zeta crystals in the ESEM.

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Structural and Textural Characterization of the Substrate and Coated Layer in an Industrial Galvannealed Interstitial-Free Steel

Cited by 5 publications

References 16 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Surface Oxidation of the High-Strength Steels Electrodeposited with Cu or Fe and the Resultant Defect Formation in Their Coating during the Following Galvanizing and Galvannealing Processes

X-ray diffraction and scanning electron microscopy of galvannealed coatings on steel

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