Atmospheric Corrosion of Galvanized Steel and Precipitation Runoff from Zinc in a Marine Environment

Vera, Rosa; Guerrero, Fabián; Delgado, Diana; Araya, Raquel

doi:10.5935/0103-5053.20130060

Cited by 7 publications

(9 citation statements)

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“…The authors have previously described the same trend for the variation in the corrosion potential over time. 16 The increase in the in situ corrosion potential of 400 mV over time corroborates the presence of corrosion products, which act as a protective film on the metal surface and hinder the spread of species that intervene in the corresponding electrochemical reactions. This behavior is in agreement with the results described above for the Zn mass loss of the galvanized steel, in which the corrosion rate in the later periods does not increase linearly but rather tends towards a constant value.…”

Section: Corrosion Potential As a Function Of Timementioning

confidence: 73%

“…Previous results obtained by the authors show a cross-section with a Zn coating (η) approximately 30 μm thick and with other layers 80 μm thick, though only the ζ phase (FeZn 13 ) is visible. 16,23…”

Section: Methodsmentioning

confidence: 99%

“…The hexagonal structure of simonkolleite is discontinuously distributed as "islands" on the metal surface, and the stability of this compound depends on the chloride ion concentration and the pH value of the environment. [15][16][17][18] These corrosion products include zinc chloride (ZnCl 2 ) and zinc sulfate (ZnSO 4 ), which are not adherent and can be physically removed from the metal surface (by wind or sand erosion) or dissolved by rain or condensation. The release of zinc ions into a medium due to the dissolution of soluble corrosion products is termed runoff.…”

Section: Introductionmentioning

confidence: 99%

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Atmospheric corrosion of galvanized steel and precipitation runoff from zinc in a marine environment

Vera¹,

Guerrero²,

Delgado³

et al. 2013

J. Braz. Chem. Soc.

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Este estudo focaliza o comportamento do aço galvanizado em um ambiente marinho corrosivo e no processo de escoamento superficial para o mesmo material que ocorrem em Valparaíso, Chile. O potencial de corrosão e a taxa de corrosão avaliados através de perda de massa foram utilizados para determinar os danos da corrosão para o aço galvanizado. As composições dos produtos de corrosão foram determinadas utilizando difratometria de raios X (XRD) e sua morfologia através da microscopia eletrônica de varredura (SEM). As soluções de escoamento coletadas após as chuvas foram analisadas para determinar o valor de pH e das concentrações dos íons Cl-, SO4 2e Zn 2+. Os resultados após 15 meses mostram que o potencial de corrosão do aço galvanizado aumenta ao longo do tempo, indicando a formação de uma película protetora que consiste em produtos de corrosão de zinco. Estes produtos foram identificados como zincita e simoncoleita. Os valores de pH obtidos para as soluções de escoamento são semelhantes das amostras de água da chuva de referência, e as concentrações de cloreto das soluções de escoamento são aproximadamente duas vezes as da água de chuva This study focuses on the behavior of galvanized steel in a corrosive marine environment and on the runoff process for the same material occurring in Valparaiso, Chile. The corrosion potential and corrosion rate evaluated via mass loss were used to determine the corrosion damage to the galvanized steel. The compositions of the corrosion products were determined using X-ray diffractometry (XRD), and their morphology through scanning electron microscopy (SEM). The runoff solutions collected after rainfall were analyzed to determine the pH value, and Cl-, SO 4 2and Zn 2+ ion concentrations. The results after 15 months show that the corrosion potential of the galvanized steel increases over time, indicating the formation of a protective film that consists of zinc corrosion products. These products were identified as zincite and simonkolleite. The pH values obtained for the runoff solutions are similar to those of the reference rainwater samples, and the chloride concentrations of the runoff solutions are approximately twice those of the rainwater.

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Section: Corrosion Potential As a Function Of Timementioning

confidence: 73%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Atmospheric corrosion of galvanized steel and precipitation runoff from zinc in a marine environment

Vera¹,

Guerrero²,

Delgado³

et al. 2013

J. Braz. Chem. Soc.

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“…Generally, in marine environment corrosion product of galvanized steel consists of simonkolleite (Zn5(OH)8Cl2•(H2O)), hydrozincite (Zn5(CO3)2(OH)6), zinc (Zn) and sodium hydroxyl-chlorosulfate (NaZn4Cl(OH)6SO4•6H2O) [27]. In present results, those are identified as zinc, zincite, hydrozincite, and simonkolleite after 200 days of exposure in Eretan District, as shown in Fig.…”

Section: Corrosion Rates Of Metalsmentioning

confidence: 54%

Atmospheric Corrosion Behavior of Carbon Steel and Galvanized Steel after Exposure in Eretan and Ciwaringin, West Java Province, Indonesia

et al. 2020

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The investigation of corrosion for carbon steel and galvanized steel has been conducted in the marine atmosphere of Eretan and Ciwaringin Districts, West Java Province. The exposure time of the field test was up to 200 days, and their corrosion rates are determined according to weight loss method. The objective of the work is to elucidate the corrosion behavior of those alloys which is affected by distances from coastline and environmental condition. The magnitude of corrosion rate for carbon steel was 20 times as high as that for galvanized steel in both districts The distance from coastline has significantly affected for the magnitude of corrosion rate, where that both alloys in Ciwaringin is lower than that in Eretan. The deposition of chloride ion in Eretan and Ciwaringin Districts were 4.305 mg/m2 day and 1.863 mg/m2 day, respectively, where the higher chloride ion can tend to increase the corrosion rates. Relative humidity (RH) which is over 60% has essential role for corrosion process as well as rainfall. The uniform corrosion attack was observed both alloys after exposure. The corrosion product phases of galvanized steel exhibits as zincite, hydrozincite and simonkolleite in Eretan as the typical coastline atmosphere phases but not in Ciwaringin. The formation of rust product for both metals lead the decrease of further corrosion attack due to the barrier between metal and environment. The usage of galvanized steel is remarkable to minimize corrosion attack compared to that of carbon steel in tropical coastline.

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“…Atmospheric corrosion may lead to material structural decay, fatigue cracking, brittle fracture, and unstable failures [ 10 , 11 ], attributable to variations in surface roughness [ 12 ] resulting from heterogeneously distributed corrosion, diminished surface area, and the formation of pitting. In Chile, studies on atmospheric corrosion have been carried out, and have determined the influence of atmospheric parameters and pollutants [ 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. In spite of the above, there still have not been many studies to determine just how drastic mechanical damage may be in the presence of different atmospheric conditions and exposure times for some zones in Chile [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Atmospheric Corrosion on the Mechanical Properties of SAE 1020 Structural Steel

et al. 2018

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Resistance to atmospheric corrosion in different environments located in Chile and the corrosion’s effect on the mechanical properties of SAE 1020 steel were studied. Atmospheric corrosivity categories at each station under study were determined. These categories were C2, for Laja; C3 and C4, for the Arica and Antarctic stations, respectively; and the most aggressive, C5 and higher at Quintero. These specific environments significantly influenced the mechanical responses of steel exposed for 36 months. Rupture elongation, the modulus of toughness, ultimate tensile strength, and hardness of the material all decreased as a function of environmental atmospheric aggressiveness. Lowered ductility is the result of the increased corrosion rate due to the high deposition of chlorides. This is due to the morphology of material degradation, which consequently occurs as pores, microstrains, and other defects that promote early rupture of the steel.

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Atmospheric Corrosion of Galvanized Steel and Precipitation Runoff from Zinc in a Marine Environment

Cited by 7 publications

References 0 publications

Atmospheric corrosion of galvanized steel and precipitation runoff from zinc in a marine environment

Atmospheric corrosion of galvanized steel and precipitation runoff from zinc in a marine environment

Atmospheric Corrosion Behavior of Carbon Steel and Galvanized Steel after Exposure in Eretan and Ciwaringin, West Java Province, Indonesia

Effect of Atmospheric Corrosion on the Mechanical Properties of SAE 1020 Structural Steel

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