Surface chemistry and reactivity of skin-passed hot dip galvanized coating

Mataigne, Jean-Michel; Vaché, Véronique; Repoux, Monique

doi:10.1051/metal/2009013

Cited by 10 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9(b), the threshold fluence and residual heat is plotted against increase in surface area (∆SA /A ) for galvanized steel samples. In this figure, the as received GI sample (GI3, ∆SA /A = 6.4%) having low η res is due to higher reflectivity of GI3 sample, resulting from the presence of higher amount of Al on the HDG steel surface [57][58][59]. On the whole, an increase in residual heat and threshold fluence is positively correlated with the increase in effective surface area.…”

Section: Discussionmentioning

confidence: 88%

Effect of surface roughness on the ultrashort pulsed laser ablation fluence threshold of zinc and steel

Mustafa

Mezera

Matthews

et al. 2019

Applied Surface Science

View full text Add to dashboard Cite

The single and multiple pulse laser ablation threshold of zinc and steel at picosecond laser pulse duration is studied as a function of initial surface roughness at laser wavelengths of 515 and 1030 nm. The initial surface topographies and the resulting crater morphologies are analyzed using confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM). Reflectivity measurements of the initial surfaces show increased absorptivity with increasing surface roughness. It was found that the single pulse ablation threshold increases with increasing effective surface area; the latter resulting from surface roughness. Rougher surfaces tend to have a higher degree of incubation as well. From the experimental and simulation results, it appears that the absorbed energy contributes more to residual heat than to material ablation when effective surface area increases.

show abstract

Section: Discussionmentioning

confidence: 88%

Effect of surface roughness on the ultrashort pulsed laser ablation fluence threshold of zinc and steel

Mustafa

Mezera

Matthews

et al. 2019

Applied Surface Science

View full text Add to dashboard Cite

show abstract

“…At this wavelength, it is difficult to observe LIPCO, because of the surface roughness (non-indexed points [3] ) and crater depth (shadowing effect [4] ). Moreover, the surface chemical composition of galvanized steel is different than pure Zn due to the presence of an Al rich oxide film, which results from precipitation during the hot dip galvanizing process [5] . Therefore, slight differences in surface chemistry or stress in the Zn crystals might also have an influence on the degree of crystal (re)orientation.…”

Section: Datamentioning

confidence: 99%

Data on laser induced preferential crystal (re)orientation by picosecond laser ablation of zinc in air

et al. 2019

View full text Add to dashboard Cite

Laser ablation of zinc is performed with a 6.7 ps pulsed laser source to investigate the ablation mechanism and resulting morphology of the irradiated surface. The data shows the changes in crater morphology, as well as chemical composition, for different number of pulses and laser fluence levels. We observed Laser Induced Preferential Crystal Orientation (LIPCO), as a result of ultra-short pulsed laser processing of Zn at a wavelength of 515 nm. Crystallographic data for other laser wavelengths, namely 343 and 1030 nm, as well as for Zn coated steel are also provided in support of this observation. Data presented in this article are related to the research article “Investigation of the ultrashort pulsed laser processing of zinc at 515 nm: morphology, crystallography and ablation threshold” [1].

show abstract

“…The effect of surface chemistry of zinc coatings to the performance of thin passivation and pretreatment layers has been to some extent discussed in earlier studies [7] [15] [16].…”

Section: Introductionmentioning

confidence: 99%

“…About 1% tensile elongation takes place at the end of the zinc coating process [16] [31], causing extensive formation of deformation twinnings. The effect of deformation twinnings on the reactivity of the zinc surface was studied with selected samples after alkaline cleaning.…”

Section: Deformation Twinningsmentioning

confidence: 99%

Effect of Hot Dip Galvanized Steel Surface Chemistry and Morphology on Titanium Hexafluoride Pretreatment

Saarimaa¹,

Markkula²,

Arstila³

et al. 2017

AMPC

View full text Add to dashboard Cite

Titanium hexafluoride pretreatments are known to improve paint adhesion and function as a barrier between the coating and the hot dip galvanized (HDG) steel surface. Interactions at the zinc/pretreatment interface are of utmost importance for the formation of pretreatment layers and the corrosion resistance of color coated hot dip galvanized steels. Removal rate of inert aluminum oxide from HDG steel samples by chemical dissolution was studied. XPS measurements showed that the surface Al 2 O 3 layer thickness decreased rapidly already at mild alkaline cleaning, while complete removal of Al required severe etching. Low reactivity of an Al 2 O 3 -rich surface was confirmed by impaired formation of a titanium hexafluoride pretreatment layer. Grain boundaries and deformation twinnings were shown to be of importance for the reactivity of the HDG surface and for the precipitation of the pretreatment chemical. Helium ion microscopy images and electron probe microanalysis (EPMA) of a pretreated sample showed accumulation of the pretreatment chemical at the grain boundaries. Al removal rate was fast at the deformation twinnings at the grain plateaus. Slow Al removal was observed at dendritic valleys and grain boundaries. The results increase understanding of the reactivity of hot dip galvanized steel surface.

show abstract

Surface chemistry and reactivity of skin-passed hot dip galvanized coating

Cited by 10 publications

References 0 publications

Effect of surface roughness on the ultrashort pulsed laser ablation fluence threshold of zinc and steel

Effect of surface roughness on the ultrashort pulsed laser ablation fluence threshold of zinc and steel

Data on laser induced preferential crystal (re)orientation by picosecond laser ablation of zinc in air

Effect of Hot Dip Galvanized Steel Surface Chemistry and Morphology on Titanium Hexafluoride Pretreatment

Contact Info

Product

Resources

About