Technologie der Feuerverzinkung und Schichtbildung

Schulz, W.‐D.; Thiele, M.

doi:10.1002/9783527622344.ch4

Cited by 3 publications

(9 citation statements)

References 7 publications

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“…The alloying elements silicon and phosphorus have a significant influence on the formation of the zinc coating. The proportion of the ζ-phase in particular increases with a higher silicon content [9]. For this reason, structural steels to be galvanized are divided into four different areas, the low-silicon, Sandelin, Sebisty, and high-silicon areas, which are differentiated according to their respective silicon and phosphorus content.…”

Section: Hot-dip Galvanizingmentioning

confidence: 99%

Laser Beam Welding under Vacuum of Hot-Dip Galvanized Constructional Steel

Frey,

Stocks,

Olschok

et al. 2024

JMMP

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Hot-dip galvanized components offer a great potential for corrosion protection of up to 100 years, while laser beam welding in vacuum (LaVa) has the advantage of high penetration depths Combined, this process chain can be economically used in steel construction of bridges, wind turbines, or other steel constructions. Therefore, investigations of butt joint welding of galvanized 20 mm thick S355M steel plates using LaVa were carried out. The butt joints were prepared under different cutting edges such as flame-cut, sawn, and milled edges, and they were studied with and without the zinc layer in the joint gap. For this purpose, the laser parameters such as the beam power, welding speed, focus position, and working pressure all varied, as did the oscillation parameters. The welds performed using an infinity oscillation with an amplitude of 5 mm represented a pore-free weld up to a zinc layer thickness of 400 µm in the joint gap. The seam undercut increased with increasing the zinc layer thickness in the joint gap, which can be explained by the evaporating zinc and consequently the missing material, since no filler material was used. The joint welds with zinc only on the sheet surface achieved a sufficient weld quality without pores.

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Section: Hot-dip Galvanizingmentioning

confidence: 99%

Laser Beam Welding under Vacuum of Hot-Dip Galvanized Constructional Steel

Frey,

Stocks,

Olschok

et al. 2024

JMMP

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“…Adams et al [57] indicated that the addition of 0.04 wt % V plus 0.05 wt % Ti is effective in reducing coating growth on reactive steels to an extent similar to the addition of Ni to the bath. However, vanadium salts are very toxic, which limits their use [58].…”

Section: Effect Of Titanium and Vanadiummentioning

confidence: 99%

“…Additionally, the addition of 0.05-0.1 wt % Bi in the bath reduces the surface tension of the liquid zinc alloy from about 750 mJ/m 2 to 620-650 mJ/m 2 (dyn/m 2 ). Such an effect of lowering the surface tension can be obtained with the concentration of lead in the bath at the level of 0.4-0.5 wt % [58]. Therefore, it is assumed that to achieve similar bath properties caused by the addition of Bi, its content is almost 10 times lower than that of the Pb addition.…”

Section: Bath Additives For Surface Layer Qualitymentioning

confidence: 99%

Development of Bath Chemical Composition for Batch Hot-Dip Galvanizing—A Review

et al. 2020

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Obtaining zinc coatings by the batch hot-dip galvanizing process currently represents one of the most effective and economical methods of protecting steel products and structures against corrosion. The batch hot-dip galvanizing process has been used for over 150 years, but for several decades, there has been a dynamic development of this technology, the purpose of which is to improve the efficiency of zinc use and reduce its consumption and improve the quality of the coating. The appropriate selection of the chemical composition of the galvanizing bath enables us to control the reactivity of steel, improve the drainage of liquid zinc from the product surface, and reduce the amount of waste, which directly affects the quality of the coating and the technology of the galvanizing process. For this purpose, the effect of many alloying additives to the zinc bath on the structure and thickness of the coating was tested. The article reviews the influence of various elements introduced into the bath individually and in different configurations, discusses the positive and negative effects of their influence on the galvanizing process. The current development in the field of the chemical composition of galvanizing baths is also presented and the best-used solutions for the selection and management of the chemical composition of the bath are indicated.

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“…Steel is never a chemically homogeneous material. From the point of view of the hot dip galvanizing process, the most important alloying element in steel is Si [9]. In Si concentration ranges below 0.3 wt.% (low-silicon steel), coatings are formed with a layered phase structure, i.e., δ 1 , ζ and η, and parabolic layer growth kinetics are observed.…”

Section: Introductionmentioning

confidence: 99%

“…At Si contents in the range of 0.12-0.22 wt.% Si, steels show lower reactivity in liquid zinc and return to the parabolic law of coating thickness growth (Sebisty's steel) [11]. On the other hand, increasing the Si content above 0.22 wt.% (high-silicon steel) again causes a rapid, linear increase in the coating thickness [9]. Therefore, changes in the Si content have a very intensive effect on the course of the reaction between steel and liquid zinc [12].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Rate of Steel in Liquid Zn, Zn-Bi and Zn-Sn Baths

Kania

2023

Coatings

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In the hot dip galvanizing process, steel products are immersed in a liquid zinc bath. The contact of steel with liquid zinc causes the corrosion of the steel as a result of Fe dissolution processes in the liquid. If the dissolution process is carried out in a controlled manner, it results in the formation of a coating. Uncontrolled dissolution leads to the degradation of the steel surface. This article presents the results of research into the influence of Bi and Sn additions to zinc baths on the corrosion of steel in liquid zinc. Corrosion tests were carried out under conditions of kinetic dissolution using the rotating disc method. The kinetic dissolution constants of steel with different Si contents in Zn, Zn-0.5Bi and Zn-2Sn baths were determined. It was found that the addition of Bi and Sn lowers the value of the dissolution constant and may act as an inhibitor of Fe dissolution in liquid zinc. Based on the measurements and the determined value of the dissolution constant, the activation energy of kinetic dissolution was determined. It was found that in the temperature range of 440–480 °C, the addition of Bi and Sn increases the value of dissolution activation energy, which reduces the intensity of Fe transfer to the zinc bath.

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Technologie der Feuerverzinkung und Schichtbildung

Cited by 3 publications

References 7 publications

Laser Beam Welding under Vacuum of Hot-Dip Galvanized Constructional Steel

Laser Beam Welding under Vacuum of Hot-Dip Galvanized Constructional Steel

Development of Bath Chemical Composition for Batch Hot-Dip Galvanizing—A Review

Corrosion Rate of Steel in Liquid Zn, Zn-Bi and Zn-Sn Baths

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