Effects of Cu and Other Tramp Elements on Steel Properties. Influences of Cu in Steel on the Formation of Alloy Layer in Hot-dip Galvanizing.

Komatsu, Atsushi; Ando, Atsushi; Kittaka, Toshiharu

doi:10.2355/isijinternational.37.283

Cited by 6 publications

(3 citation statements)

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“…Many reports have focused on the wettability of liquid Zn on steels containing Si and Mn. [4][5][6][7][8][9][10][11][12][13][14] The wettability of liquid Zn on steels has been reported to improve upon addition of Ni to the liquid Zn bath 10) or by oxidation and reduction processing 9) etc. The wettability of liquid Zn on steels has been qualitatively evaluated after galvanizing processing by counting the number of defects with bad-wetting 11,12) or measuring the mechanical adhesion properties of a Zn layer with steel substrates.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Si and Mn Content on Dynamic Wetting of Steel with Liquid Zn

et al. 2009

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Section: Introductionmentioning

confidence: 99%

The Effect of Si and Mn Content on Dynamic Wetting of Steel with Liquid Zn

et al. 2009

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“…This phenomenon has possibilities to be applied to such processes as Cu coating, the zinc galvanizing process [2][3][4][5] of steels for automobiles, and to the joining of steel to dissimilar materials, because the porous layer acts as the relief area on thermal expansion. In addition, after certain materials (such as liquid metals or oxides) have penetrated the porous layer at the iron substrate surface, soaking the samples in acid aqueous solution results in the removal of the iron substrate, thereby affording a porous film that replicates the shape of the pores.…”

Section: Introductionmentioning

confidence: 99%

Effect of Iron Substrates on Reduced Porous Morphologies Adequate for Unusual Wetting

Takahira

Tanaka

2007

Mater. Trans.

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The authors have found that liquid metal droplets wetted and spread very widely on solid iron substrates in a reducing atmosphere after the surface oxidation of the specimens. This unusual wetting is caused by capillary penetration into the porous layer formed on the iron sample that is reduced after first being oxidized in air. In order to find adequate conditions for the unusual wetting behavior, the effect of the underlying iron substrate on the reduced porous morphology of the oxidized Fe layer has been investigated. Pores in the porous iron layers of all samples formed on iron substrates are 3-dimensionally inter-connected, while those of the porous iron films of some samples without underlying iron substrates were partially isolated and not entirely connected within the films. Adequate porous iron layers that show this unusual wetting behavior were obtained mainly from reduction of the oxidized iron layer formed on the surface of iron substrates rather than from reduction of the oxidized iron films formed without underlying iron substrates.

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“…[13][14][15] The steel surface will be primarily exposed to an oxidizing atmosphere to form an Fe oxide layer (Fe pre-oxidation), which can be reduced by hydrogen in the reduction process that follows (post-reduction). It has been explained that good © 2014 ISIJ wettability can be obtained due to the formation of pure iron.…”

Section: Introductionmentioning

confidence: 99%

Influence of Fe Oxidation on Selective Oxidation Behavior of Si and Mn Added in High Strength Sheet Steel

Fushiwaki¹,

Nagataki²,

Nagano³

et al. 2014

ISIJ Int.

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In the process of hot dip galvanizing high tensile strength sheet steels containing Si and Mn, selective surface oxidation of Si and Mn causes coating defects. One promising method for overcoming this problem is an oxidation-reduction process. When the steel surface is exposed to an oxidizing atmosphere, it will react primarily by forming an Fe oxide, which can be reduced by hydrogen in a reduction process that follows. It has been explained that good wettability can be obtained due to the formation of pure iron. However, the mechanism of suppression of selective surface oxidation has not been clearly understood in detail yet.In order to reveal this mechanism, the present study focused on both Mn and Fe oxidation behavior during the oxidation-reduction process for a cold-rolled sheet steel containing 0.25mass%Si-1.8mass%Mn. Surface and cross-sectional analyses were performed by using secondary electron microscopy and transmission electron microscopy. Selective surface oxidation behavior was investigated by glow discharge optical emission spectroscopy.The main results obtained are as follows. First, selective surface oxidation of Mn was suppressed even if soaking was continued after completion of the reduction of the Fe oxide.Second, as the reduction process proceeded, Mn was trapped as an internal oxide under the Fe oxide layer. Moreover, depletion of solute Mn was observed in the matrix.From these results, depletion of solute Mn is supposed to suppress the outer diffusion of Mn during soaking. Therefore, selective surface oxidation of Mn is suppressed even after Fe oxide reduction is completed.

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Effects of Cu and Other Tramp Elements on Steel Properties. Influences of Cu in Steel on the Formation of Alloy Layer in Hot-dip Galvanizing.

Cited by 6 publications

References 0 publications

The Effect of Si and Mn Content on Dynamic Wetting of Steel with Liquid Zn

The Effect of Si and Mn Content on Dynamic Wetting of Steel with Liquid Zn

Effect of Iron Substrates on Reduced Porous Morphologies Adequate for Unusual Wetting

Influence of Fe Oxidation on Selective Oxidation Behavior of Si and Mn Added in High Strength Sheet Steel

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