Development of zinc oxide-rich inner layers in hot-dip zinc coating for barrier protection

Shibli, S.M.A.; Manu, R.

doi:10.1016/j.surfcoat.2006.04.012

Cited by 20 publications

(5 citation statements)

References 19 publications

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“…As observed by Shibli (2006), the presence of silicon in the coated steel strongly influences coatings formation and their properties. The mechanisms of silicon interaction with galvanizing reactions can be summarizing as follows ( Figure 1) [8]:  Galvanizing reactions move Feα toward Γ phase;  Silicon does not move toward Γ phase because its solubility in Γ is very low. As consequence silicon increases its contents at Feα-Γ interface;  α-Fe, rich in silicon, breaks the interface, and particles enter in the δ phase;  Particles dissolving in the δ phase increases the thickness.…”

mentioning

confidence: 86%

“…For instance, stable reaction products that allow improving corrosion resistance have been observed on electrochemically passivated HDG surface [4][5][6]. Other authors analysed the influence of alloy elements in terms of microstructural phases compositions [8]. As observed by Shibli (2006), the presence of silicon in the coated steel strongly influences coatings formation and their properties.…”

mentioning

confidence: 99%

“…Other authors analysed the influence of alloy elements in terms of microstructural phases compositions [8]. As observed by Shibli (2006), the presence of silicon in the coated steel strongly influences coatings formation and their properties. The mechanisms of silicon interaction with galvanizing reactions can be summarizing as follows ( Figure 1) [8]:  Galvanizing reactions move Feα toward Γ phase;  Silicon does not move toward Γ phase because its solubility in Γ is very low.…”

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confidence: 99%

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Intermetallic phase kinetic formation and thermal crack development in galvanized DCI

Bellini

Carlino²

2019

Frattura Ed Integrità Strutturale

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A new class of material characterized by mechanical properties close to the traditional low and medium carbon steel is the Ductile Cast Irons (DCIs). High castability and low production costs allow them to be used in many fields, ranging from automotive to piping. In this class of iron-based alloy the content of carbon is mainly localized in the graphite nodules, which are dispersed in a metallic matrix characterized by different phases: ferrite, austenite, pearlite, martensite or their mix, depending on the chemical composition and the heat treatment. Metallic matrix is subjected to the corrosion phenomenon, and, for this reason, the study and the development of traditional and innovative protection techniques are important, mainly in critical applications. Hot dip galvanizing is one of the investigated protections because the zinc is able to protect the iron-based alloys thanks to the reduction potential that is lower than the iron one. In this work, a ferritic-pearlitic DCI (GS500) is galvanized by using a pure Zn bath at 440°C in order to generate a zinc coating at different dipping time. The presence of thermal cracks is observed by means of a Scanning Electron Microscope (SEM).

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confidence: 86%

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confidence: 99%

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Intermetallic phase kinetic formation and thermal crack development in galvanized DCI

Bellini

Carlino²

2019

Frattura Ed Integrità Strutturale

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“…As a matter of fact, it was experimentally observed that a content of silicon between 0.03% and 0.12% in weight (sandelin range) or higher than 0.25% in weight (hyper-sandelin steels) is able to accelerate the Zn-Fe diffusion, resulting in coatings characterized by high thickness. [23] Moreover, the combined effect of silicon and phosphorus amplifies the sandelin effect. Also, the steel state can influence the coating thickness, and more precisely its surface roughness, due to both the carryover effects and the increased specific surface.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Traditional and Technological Zinc‐Based Coatings: Part I

et al. 2022

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Herein, the bending behavior of a hot‐rolled hyper‐sandelin steel subjected to hot‐dip galvanizing (HDG) is numerically simulated. Two coating types are analyzed, that is, a pure zinc coating and a zinc‐based coating with 3% Sn addition by weight. It is experimentally observed that the tin addition influences the thickness of each intermetallic phase and increases the ductility of the intermetallic phases. Therefore, the key of the numerical simulation is to assume suitable constitutive laws to phase layers, by considering that only few mechanical parameters are available in the literature. Such an approach has shown quite satisfactory results and it can be promising as a numerical tool to be used by HDG industry, being quite simple but quite accurate to estimate flexural strength and damage of Zn‐based coated steels.

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“…At present, the technologies of coating an inner surface of the tube generally adopt physical vapour deposition (PVD) [ 5 – 7 ], chemical vapour deposition (CVD) [ 8 – 11 ], electroplating [ 12 , 13 ], electrical explosion [ 14 , 15 ] and dip-coating [ 16 – 18 ]. They are summarized in table 1 for the comparisons of processes and sizes of the films.…”

Section: Introductionmentioning

confidence: 99%

Hypergravity-assisted chemical liquid deposition of nano-granular film on the inner surface of a quartz tube

Shen

et al. 2018

R. Soc. open sci.

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Transparent tubes with functions of heating and temperature measurement are badly required in the visualization investigation of two-phase flows and flow-boiling heat transfer. In order to prepare such a tube, we introduced a cost-effective and energy-efficient procedure of hypergravity-assisted chemical liquid deposition (HACLD) to produce transparent and conductive silver (Ag) films on the inner surfaces of quartz tubes, typically 50 mm in length and 8 mm in inner diameter with a set-up that was designed and built for this purpose. Precursors of organometallic Ag precursor solutions were prepared by dissolving silver citrate and 1,2-diaminopropane in 2-methoxyethanol with required concentration for the chemical liquid deposition process. Semitransparent and conductive Ag films formed inside the required quartz tubes under specific heating process in hypergravity. One of the films was about 47 nm in thickness, 23 Ω per square sheet resistance, and 30% optical transmittance. This attempt may pave a way for the understanding of the film forming mechanism in hypergravity, and the development of a film preparation technology of HACLD.

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Development of zinc oxide-rich inner layers in hot-dip zinc coating for barrier protection

Cited by 20 publications

References 19 publications

Intermetallic phase kinetic formation and thermal crack development in galvanized DCI

Intermetallic phase kinetic formation and thermal crack development in galvanized DCI

Numerical Simulation of Traditional and Technological Zinc‐Based Coatings: Part I

Hypergravity-assisted chemical liquid deposition of nano-granular film on the inner surface of a quartz tube

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