Hot-dip galvanizing and the environment

Kuklík, Vlastimil; Kudláček, Jan

doi:10.1016/b978-0-08-100753-2.00013-6

Cited by 3 publications

(5 citation statements)

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“…an interaction between both layers. The synergy results in the durability longer than summed durability of individual layers [1]. This is however only a theoretical durability of duplex coating system.…”

Section: Duplex Coating System Durabilitymentioning

confidence: 98%

Corrosion Protection of Structural Steelwork by a Duplex Coating System

Siostrzonek

Pavelková

Koldová

et al. 2015

MSF

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Steel constructions are an integral part of our lives, surrounding us almost everywhere. They are used for erection of various halls, bridge structures, railings etc. Each steelwork is more or less impaired by corrosion, respectively a certain level of corrosion aggressiveness of the environment. Corrosion is the cause of material degradation - referred to rusting. In order to avoid this unwanted phenomenon to the maximum extent possible, we use various methods and technologies protecting the relevant material and preventing from corrosion occurrence and development. This article deals with one of the methods aimed at corrosion protection of structural steelwork - duplex coating system that is assured by means of hot dip galvanizing followed by paint system application.

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Section: Duplex Coating System Durabilitymentioning

confidence: 98%

Corrosion Protection of Structural Steelwork by a Duplex Coating System

Siostrzonek

Pavelková

Koldová

et al. 2015

MSF

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“…The technological process of hot-dip galvanizing utilizes immersion of a steel component in molten zinc at 450-470 • C. The galvanizing itself is preceded by the surface pre-treatment of the steel. Surface preparation is an important step, which begins with degreasing, followed by pickling and immersion in flux, with the aim of removing fats, oils, metal oxides, and other contaminants from the steel surface [2,16,17].…”

Section: Introductionmentioning

confidence: 99%

“…As a flux in dry hot-dip galvanizing, an aqueous solution of ZnCl 2 :2NH 4 Cl salts is applied, most often in a 1:2 ratio. The zinc coating is formed by a mutual reaction between molten zinc and steel to form the zinc-iron alloy phase [2,16,17].…”

Section: Introductionmentioning

confidence: 99%

“…When a steel component is immersed in the zinc bath, violent reactions occur where particles evaporate in the form of white fumes, which are collected on the filters, producing GFD waste. It is a product of zinc chloride and ammonium chloride decomposition contained in the fluxes [2,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…The waste generated in the process of batch hot-dip galvanizing is in relatively low quantities (approximately 1 kg of GFD per ton of galvanized steel) compared to other solid waste, which causes its problematic processing [16,17,22].…”

Section: Introductionmentioning

confidence: 99%

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Utilization of Galvanizing Flue Dust Residue: A Sustainable Approach towards Complete Material Recycling

Pirošková,

Klimko,

Ružičková

et al. 2024

Metals

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During hot-dip galvanization, wastes such as bottom dross, zinc ash, spent pre-treatment solutions, and galvanizing flue dust (GFD) are generated. In scientific publications, research devoted to GFD waste recycling is absent, and companies generating this waste require a solution to this complex problem. GFD is often landfilled in hazardous waste landfills. However, it is possible to process this waste hydrometallurgically, where GFD is first leached, the solution is refined, and finally, zinc metal is obtained by electrowinning. During specific environmentally friendly leaching, not all solid GFD is dissolved, and the aim of this study is to process the remaining solid GFD residue. The analysis shows that the GFD residue material mainly contains zinc (42.46%) in the form of oxides, but there is also a small amount of polluting elements such as Al, Fe, and Pb. This study examines the leaching of the samples in HCl and H2SO4 under different conditions with the aim of obtaining a solution with a high concentration and high leaching efficiency of zinc. The L/S ratio of 3, 4 M H2SO4, and ambient temperature proved to be optimal for the leaching of the GFD residue, where 96.24% of zinc was leached out, which represents a zinc concentration of 136.532 g/L.

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