Application of thermodynamics and Wagner model on two problems in continuous hot-dip galvanizing

Liu, Huachu; He, Yanlin; Li, Lin

doi:10.1016/j.apsusc.2009.08.095

Cited by 40 publications

(17 citation statements)

References 21 publications

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“…Second, previous works reported that alloy elements in high strength steel, such as Al, Mn, Si, and Cr, will be selectively oxidized under a protective atmosphere of H 2 + N 2 plus trace amount of water vapor, leading to bare spot defects [5,6]. When dipping sheet steel into the zinc bath, dissolved Al in the bath can reduce some oxides (such as MnO) produced by selective oxidation during the recrystallization or intercritical annealing, thus improves the galvanizing property [5,7,8].…”

Section: Introductionmentioning

confidence: 97%

Characterization of hot-dip galvanized coating on dual phase steels

Liu

Wen

et al. 2011

Surface and Coatings Technology

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Section: Introductionmentioning

confidence: 97%

Characterization of hot-dip galvanized coating on dual phase steels

Liu

Wen

et al. 2011

Surface and Coatings Technology

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“…This transition can be induced by raising the dewpoint of the annealing furnace atmosphere. 16,[18][19][20] Raising the atmospheric dewpoint increases the surface oxygen concentration and the flux of oxygen into the steel, promoting internal oxidation over external oxidation. The classic analytical model of this transition phenomenon was formulated by Wagner.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Microstructure on Oxidation of a CMnSi Advanced High Strength Steel

Story¹,

Webler²

2017

ISIJ Int.

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The work presented here demonstrated that changes to the near-surface microstructure could promote internal oxidation in a CMnSi advanced high strength steel (AHSS) grade. The starting material was industrially-supplied cold-rolled sheet. Samples with this microstructure were compared against two other conditions: annealed at 1 200°C and 850°C prior to oxidation. The surface regions of both annealed samples were decarburized. All samples were then oxidized at 850°C in an argon atmosphere with approximately 10 − 20 atm oxygen for 5-90 minutes. The oxidation treatments were performed in a high-temperature confocal scanning laser microscope (CSLM) setup that enabled in-situ visualization of surface oxide formation. Analysis of CSLM and scanning electron microscopy (SEM) images of sample surfaces indicated there were differences in oxide morphology and coverage between samples with different starting microstructures. Cold-rolled samples showed little internal oxidation but extensive external oxidation. Samples annealed prior to oxidation exhibited both internal and external oxidation. The differences in behavior were attributed to the formation of a decarburized surface layer during the pre-anneal, which led to ferritic iron near the surface. Another result of the pre-anneal was a reduction in dislocation density, which potentially led to fewer preferential nucleation sites for oxides very close to the sample surface.

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“…However, after the aluminothermic reduction, the dissolved Al will be locally consumed, leading to the formation of brittle Fe-Zn phase rather than Fe-Al compound. 5,[13][14][15] Oren also pointed out that manganese oxides tend to form at grain boundaries and the wetting problem is not severe. 15 …”

Section: Mn Oxidementioning

confidence: 99%

“…4,16 Although from a thermodynamic view SiO 2 can be reduced by dissolved Al from zinc bath, there is no experimental evidence for it. 5 Al oxide Al 2 O 3 forms under low potential oxygen atmosphere on the surface of Al-containing steel. Under low oxygen potential atmosphere, Al 2 O 3 can form on the external steel surface.…”

Section: Si Oxidementioning

confidence: 99%

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Thermodynamic consideration on selective surface oxidation of high strength steels prior to hot-dip galvanizing

Liu

Shi

et al. 2011

J Coat Technol Res

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The galvanizability of high strength steel is dependent on the surface selective oxidation of alloy elements during intercritical annealing. First, this study reviewed the selective oxidation of Mn, Si, Al, Cr, and their possible products. Then we applied three sets of elemental activity data, i.e., calculated from ThermoCalc, molar fraction, and a M (M = Mn, Si, Al, Cr) = 1 to calculate the equilibrium oxygen partial pressure of each oxidation reaction. It was found that there is a significant deviation among the results calculated from different data. Finally, this study established the stabilities and precipitation sequences of Mn-Si, Mn-Al and Mn-Cr mixed oxides, and proposed a new Mn-Cr rule to predict the oxides formed on the surface of Mn-Cr steel.

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Application of thermodynamics and Wagner model on two problems in continuous hot-dip galvanizing

Cited by 40 publications

References 21 publications

Characterization of hot-dip galvanized coating on dual phase steels

Characterization of hot-dip galvanized coating on dual phase steels

Effect of Surface Microstructure on Oxidation of a CMnSi Advanced High Strength Steel

Thermodynamic consideration on selective surface oxidation of high strength steels prior to hot-dip galvanizing

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