Corrosion Resistance and Protection Mechanism of Hot-dip Zn-Al-Mg Alloy Coated Steel Sheetunder Accelerated Corrosion Environment

Komatsu, Atsushi; Izutani, Hidefusa; Tsujimura, Tohru; Andoh, Atsushi; Kittaka, Toshiharu

doi:10.2355/tetsutohagane1955.86.8_534

Cited by 44 publications

(21 citation statements)

References 4 publications

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“…Many papers 5,6) have dealt with addition of alloying elements to the alloying bath to improve the anti-corrosion properties of the coating, however these coatings are thin and directed to use with automobiles. For relatively thick coating of structural steels, there is little information on the effect of foreign additional elements, except the papers by Komatsu et al [7][8][9] They added Mg to the Zn-Al alloy bath and investigated the corrosion behavior of the Zn-6Al-Mg coating, showing a beneficial effect of Mg in prevention of corrosion. However, details of the Mg effect on the surface morphology and coating structure are still not entirely clear.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mg and Si on the Microstructure and Corrosion Behavior of Zn-Al Hot Dip Coatings on Low Carbon Steel.

et al. 2002

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Section: Introductionmentioning

confidence: 99%

Effect of Mg and Si on the Microstructure and Corrosion Behavior of Zn-Al Hot Dip Coatings on Low Carbon Steel.

et al. 2002

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“…In particular, in the construction area, where they are often used in harsh conditions under a corrosive environment, such as outdoors, the use of hot-dip Zn-Al-Mg alloy-coated steel sheets with improved corrosion resistance through the addition of Mg has recently been expanding. [1][2][3] From the viewpoint of bath control, or aiming at improving corrosion resistance, such hot-dip Zn-Al-Mg alloy-coated steel sheets are designed to have a large added amount of Mg as well as Al. 3) An Al-Fe intermetallic compound is prone to thick growth within hot-dip Zn-Al alloy-coated steel sheets containing Al of 5 mass% (abbreviated to % hereinafter) or more.…”

Section: Introductionmentioning

confidence: 99%

Influence of Si Addition to the Coating Bath on the Growth of the Al–Fe Alloy Layer in Hot-dip Zn–Al–Mg Alloy-coated Steel Sheets

2011

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The influence of Si addition to the coating bath on the growth of the Al-Fe alloy layer formed in the interface between the coating and steel substrate was studied utilizing a Zn-Al-Mg coating bath with 10-11 mass% Al content. While the Al-Fe intermetallic compound rapidly grew in the interface between the coating and steel substrate when dipped into a coating bath of Zn-10mass%Al-3mass%Mg at 550°C, the growth was remarkably suppressed by the addition of 0.2mass%Si to the coating bath. TEM observation revealed that, in the interface between the coating and the substrate, Si addition resulted in the uniform formation of very fine grains of 20-30 nm in diameter in the Fe2Al5 phase with dissolved Si and Zn in a solid solution. The mechanism of Si addition was postulated to be as follows: the large amount of Fe in the substrate could be dissolved easily into the liquid phase in the case of a ternary Fe-Al-Zn system, whereas in the case of a quaternary Fe-Al-Zn-Si system, the dissolution of Fe into the liquid phase was significantly suppressed by the presence of very fine, thin Fe2Al5 containing Si in the interface between the coating and the steel substrate. Thus, the growth rate of Fe2Al5 was greatly reduced.

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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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Corrosion Resistance and Protection Mechanism of Hot-dip Zn-Al-Mg Alloy Coated Steel Sheetunder Accelerated Corrosion Environment

Cited by 44 publications

References 4 publications

Effect of Mg and Si on the Microstructure and Corrosion Behavior of Zn-Al Hot Dip Coatings on Low Carbon Steel.

Effect of Mg and Si on the Microstructure and Corrosion Behavior of Zn-Al Hot Dip Coatings on Low Carbon Steel.

Influence of Si Addition to the Coating Bath on the Growth of the Al–Fe Alloy Layer in Hot-dip Zn–Al–Mg Alloy-coated Steel Sheets

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

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