The Influence of  CO 2 and NaCl on the Atmospheric Corrosion of Zinc: A Laboratory Study

Falk, Tobias; Svensson, Jan‐Erik; Johansson, Lars‐Gunnar

doi:10.1149/1.1838753

Cited by 81 publications

(66 citation statements)

References 3 publications

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“…At low CO 2 concentrations, ZnO was the main corrosion product. These results agree with investigations made on open surfaces [10,11], where it was found that the corrosion rate was considerably higher at low CO 2 concentrations (< 1 ppm) than it was at the ambient concentration of 350 ppm. The effect was explained by neutralisation of the surface electrolyte at the cathodic sites and the precipitation of less soluble zinc hydroxychloride.…”

Section: Introductionsupporting

confidence: 92%

In situ studies of the corrosion during drying of confined zinc surfaces

Persson¹,

Mikhailov

Thierry

2007

Materials & Corrosion

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The corrosion process during the drying out of zinc surfaces confined in crevices was studied using real time photograpy and in situ FTIR microspectroscopy. A pH-indicator was used to visualise differences in the pH during the drying process. The distribution and the composition of the corrosion products after several wetting and drying cycles were studied with FTIR microspectroscopy and SEM-EDS. An area with high pH formed during the drying process at the border of the electrolyte, with a zone of white corrosion products that contained zinc hydroxycarbonate in the electrolyte inside this area. A differential aeration cell is present at the border of the electrolyte, and the cathodic oxygen reduction reaction takes place close to the border of the electrolyte during the drying process. The corrosion attack and the distribution and composition of the corrosion products on the surface depend strongly on the drying process of the surface. The corrosion attack of confined surfaces was localised, with a significantly higher corrosion attack in some areas. Outside the drying front a thin layer of electrolyte formed as a result of surface tension driven flow of electrolyte from the electrolyte border. This effect was attributed to the alkaline pH of the electrolyte due to the oxygen reduction reaction at the border. A galvanic element was formed between the local cathodes in the area outside the drying front and the anode in the area with bulk electrolyte. The main corrosion products detected after several wet dry cycles were ZnO, Zn 5 (OH) 6 (CO 3 ) 2 and Zn 5 (OH) 8 Cl 2 Á H 2 O, but Na 2 CO 3 Á 10H 2 O was also detected. The corrosion products were non-homogeneously distributed on the surface and the distribution was related to the anodic and cathodic processes that took place in different regions on the surface during the corrosion process.

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Section: Introductionsupporting

confidence: 92%

In situ studies of the corrosion during drying of confined zinc surfaces

Persson¹,

Mikhailov

Thierry

2007

Materials & Corrosion

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“…EDX analysis indicates the presence of high concentration of Zn, Cl, O, and small amount of Sn in the layer. Combining the EDX results in this work and those in the literature [18,[28][29][30], it is deduced that these corrosion products were mixtures of zinc hydroxychloride (simonkolleite, Zn 5 (OH) 8 Cl 2Á H 2 O) and ZnO/Zn-(OH) 2 , probably with some tin hydroxychloride. The dominant composition of zinc of the corrosion products also suggests that pitting attack of the alloy is intimately connected with local selective dissolution of zinc within the microstructure.…”

Section: Cross-sectional Characterization Of Corrosion Productssupporting

confidence: 74%

“…In the presence of chloride ions, especially when the chloride concentration is higher than 0.01 M, Cl À will move towards the zinc dissolution sites, where the insoluble zinc hydroxychloride (simonkolleite), Zn 5 (OH) 8 Cl 2 zH 2 O, may form gradually [28]:…”

Section: Corrosion Mechanism Of Sn-zn Alloys In Chloridecontaining Somentioning

confidence: 99%

Understanding corrosion mechanism of Sn–Zn alloys in NaCl solution via corrosion products characterization

Liu

Wang

Xie

et al. 2015

Materials & Corrosion

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The corrosion products formed on Sn-Zn solder alloys were systematically studied to elucidate the corrosion mechanism of Sn-Zn alloys in chloridecontaining solution. Sn-Zn alloys were subjected to immersion and polarization treatment in a 0.5 M NaCl solution. Ex situ analysis, including surface and crosssection, of the corrosion products was carried out by scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectroscopy (EDX). The corrosion products presented porous microstructure formed by a fine interlinked network. An increase of zinc content resulted in more pores and cracks of the corrosion products, indicating degradation of corrosion resistance. Intriguing is the finding that a gradient of chlorine concentration from the outer layer inwards the alloys through the Zn-rich precipitates is observed, which demonstrates the migration of chloride ions inwards the alloys. Based on the results, a corrosion mechanism was proposed and discussed that explains the observations. Particular attention was paid to the anodic dissolution of Zn-rich precipitates.

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“…The minerals that form are functions of the gas phase composition, in particular CO 2 , and the aqueous solution composition. As expected the corrosion products that form are a function of chloride and sulfate content of the aqueous solutions (Falk et al, 1998;Blucher et al, 2003;Linstrom et al, 2004). The net effects of these precipitation reactions at the cathodic sites are inhibition of oxygen reduction reaction by blocking of sites and the loss of water due to removal of aqueous ionic species due to mineral precipitation.…”

Section: Chemical Transformations In Thin Films On Alloy 22mentioning

confidence: 52%