Characterization of black rust staining of unpassivated 55% Al–Zn alloy coatings. Effect of temperature, pH and wet storage

Wallinder, Inger Odnevall; He, Weidong; Augustsson, P. E.; Leygraf, C.

doi:10.1016/s0010-938x(99)00043-8

Cited by 38 publications

(15 citation statements)

References 7 publications

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“…The spectral intensity around 290 eV is very small where contribution from carbonate molecules is expected, indicating that only a very small amount of the metal carbonate was formed during the zinc weathering. 21 After Alk-dg, the relative intensity of the contribution from carbonate increases compared to the contribution from the low-binding-energy structure. It is possible that on the Ac-treat surfaces, which showed the highest intensity of the high-binding-energy structure, some metal carbonates have formed on the surface, although this is rather peculiar since ZnCO 3 is soluble in acids.…”

Section: Discussionmentioning

confidence: 99%

The influence of alkali‐degreasing on the chemical composition of hot‐dip galvanized steel surfaces

Berger

Bexell

Stavlid

et al. 2006

Surface & Interface Analysis

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The influence of dipping temperature and time on the surface chemistry of hot-dipped galvanized steel sheets during the alkaline degreasing process is investigated. The surface chemistry was monitored with scanning Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS), and time-of-flight secondary ion mass spectroscopy (ToF-SIMS). The results show high Al concentrations on the untreated surfaces, which are significantly reduced during alkaline degreasing. The same conclusions could be drawn for the carbon compounds that accumulate on the surface during storage. The measurements reveal a gradual reduction in surface Al as the alkali solution temperature and/or degreasing time are increased. When degreasing was conducted at 70°C for 30 s the surface was practically free from Al, which was present only in small islands. Furthermore, the experiments showed that the thickness of the oxide film covering the surfaces before and after alkaline degreasing is approximately 20Å. The main constituents of the film varied from ZnAl hydroxide/oxide to Zn hydroxide/oxide, before and after degreasing, respectively.

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Section: Discussionmentioning

confidence: 99%

The influence of alkali‐degreasing on the chemical composition of hot‐dip galvanized steel surfaces

Berger

Bexell

Stavlid

et al. 2006

Surface & Interface Analysis

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“…This phenomenon is known for aluminium and aluminium–zinc coatings and is described in the literature as wet storage stain or black rust stain. [ 14‐16 ] The formed oxide layers are dense, tightly adhering and cannot be removed by a subsequent pickling process with HNO 3 . To illustrate this, Figure 8 shows a specimen mechanically ground with Abrasive C after 48 hr condensed water test and after pickling with HNO 3 for 10 min.…”

Section: Resultsmentioning

confidence: 99%

Investigation of the influence of iron‐containing abrasives on the corrosion behaviour of the aluminium alloy AlSi1.2Mg0.4

Babutzka

Müller

Mietz

et al. 2020

Materials & Corrosion

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The corrosion resistance of aluminium surfaces is closely linked to the surface state after a grinding process. For years, iron-containing abrasive materials were suspected to lead to increased corrosion susceptibility after processing of aluminium surfaces. To prove a possible correlation between the iron content of an abrasive and the corrosion behaviour of aluminium components, scientific investigations and experimentally practical corrosion tests are necessary. For the current investigation, specimens of a technical Al-Si alloy from the same batch were used. The test specimens were mechanically ground with various resin-bonded model abrasives containing different iron contents. The performed corrosion tests did not reveal a negative influence of the different iron-containing abrasives on the corrosion behaviour of the Al-Si alloy. However, the most sensitive measuring method (electrochemical noise) showed differences in the surface activity depending on the type of abrasive.

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“…The dissolved metal precipitates as hydroxide on the surface, thereby embedding non-reacted metallic aluminium and zinc in the corrosion layer. 32 On the Zn-rich regions (cf. Fig.…”

Section: Discussionmentioning

confidence: 99%

XPS and AES characterization of hydrolysed γ‐mercaptopropyltrimethoxysilane deposited on Al, Zn and Al–43.4Zn–1.6Si alloy‐coated steel

Bexell

Grehk

Olsson

et al. 2004

Surface & Interface Analysis

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In this paper Al, Zn and Al-43.4Zn-1.6Si (AlZn) alloy-coated steel have been treated with the organofunctional silane g-mercaptopropyltrimethoxysilane (g-MPS). The influence of different metal substrates on the structure and composition of the silane films was investigated with XPS and AES. The films were obtained by dipping the substrates in the silane solution followed by a blow-dry procedure in nitrogen gas.The results show that the surface concentration of the deposited silane is independent of the metal substrate and that the thickness of the silane film is non-uniform. The AES measurements indicate that the silane film covers the entire substrate surface and XPS analysis of the silane-treated substrate surfaces at different take-off angles indicates that the g-MPS molecule is randomly orientated. Also, the results show that the silane is well hydrolysed under the solution conditions used. Finally, in the zinc-containing silane-metal systems, i.e. the silane-treated AlZn and Zn substrates, the results indicate that the g-MPS molecules can bond to the substrate surfaces via the thiol group of the molecule.

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Characterization of black rust staining of unpassivated 55% Al–Zn alloy coatings. Effect of temperature, pH and wet storage

Cited by 38 publications

References 7 publications

The influence of alkali‐degreasing on the chemical composition of hot‐dip galvanized steel surfaces

The influence of alkali‐degreasing on the chemical composition of hot‐dip galvanized steel surfaces

Investigation of the influence of iron‐containing abrasives on the corrosion behaviour of the aluminium alloy AlSi1.2Mg0.4

XPS and AES characterization of hydrolysed γ‐mercaptopropyltrimethoxysilane deposited on Al, Zn and Al–43.4Zn–1.6Si alloy‐coated steel

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