A review of the atmospheric corrosion of zinc in outdoor and indoor atmospheres

Castaño, Juan G.; Botero, Carlos Andrés Aristizábal; Peñaranda, Sergio

doi:10.3989/revmetalm.2007.v43.i2.60

Cited by 5 publications

(3 citation statements)

References 30 publications

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“…found in the atmosphere. [11][12][13][14] Because this study is performed in a marine atmosphere, it is important to consider the zinc corrosion products in this medium, which are simonkolleite (Zn 5 (OH) 8 Cl 2 • H 2 O), hydrozincite (Zn 5 (CO 3 ) 2 (OH) 6 ) and zinc and sodium hydroxyl-chlorosulfate (NaZn 4 Cl(OH) 6 SO 4 • 6H 2 O). Simonkolleite is the most commonly formed product within a few days of exposure.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…It must be borne in mind the environment to which these traffic signals are exposed, with thousands of vehicles passing and emitting exhaust gases. Thus, with the time and climate conditions, the guardrails and other traffic signals are exposed to strong corroding conditions; in a first stage, the Zn layer undergoes the classical passivation step and transforms to zincite, ZnO (equation ), which continues reacting at high humidity conditions with the CO 2 from the traffic exhaust and gives smithsonite, ZnCO 3 and/or hydrozincite as it is elsewhere described, depending on the relative humidity and CO 2 partial pressure (Equations ).

{Zn + H}_{2} O + \frac{1}{2} {normalO}_{2} \overset{}{\to} {Zn(OH)}_{2} \overset{}{⇄} {ZnO + H}_{2} O

{ZnO + CO}_{2} \overset{}{\to} {ZnCO}_{3}

{5 ZnO + 2 CO}_{2} {+ 3 H}_{2} O \overset{}{\to} {Zn}_{5} {{(CO}_{3})}_{2} {(OH)}_{6}

{5 Zn(CO}_{3} {) + 3 H}_{2} O \overset{}{⇄} {Zn}_{5} {{(CO}_{3})}_{2} {(OH)}_{6} + {3 CO}_{2} ↑

…”

Section: Resultsmentioning

confidence: 99%

Raman spectroscopy assisted with XRF and chemical simulation to assess the synergic impacts of guardrails and traffic pollutants on urban soils

Carrero

Goienaga

Olivares

et al. 2012

J Raman Spectroscopy

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Urban soils are potential reservoirs of toxic metals as a consequence of traffic emissions. Sources like brake linings, tyres, road pavement, exhaust fumes, guardrail, traffic signals and other galvanised steel structures are used in a large variety of external constructions in the modern urban areas. Their beneficial properties from a corrosion and oxidation perspective are well-known but less is known about their contribution to the environmental fate of corrosion-induced released zinc. In this work, the impact of guardrails and other traffic pollutants on urban soils has been studied by means of Raman spectroscopy (molecular speciation) and thermodynamic speciation to understand the mechanisms of metal release and uptake by the soils. Hydrozincite, Zn 5 (CO 3 ) 2 (OH) 6 , was identified by means of Raman spectroscopy as the degradation compound of the galvanised zinc layer from guardrails which leads to the formation of soluble zinc, by acidic attack of the urban atmosphere, that drops and accumulate (zinc nitrate was identified) in soils. This fact shows the environmental risk of zinc release from the guardrails because zinc nitrate can be easily mobilised by water runoff, affecting the surrounding areas or groundwater. Other traffic pollutant that reaches guardrail and soil by atmospheric deposition, such as barium, was also identified in soil as well as in the guardrail in its carbonate form, BaCO 3 . Because of its low solubility, barium will accumulate in urban soils.

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“…In the case of steel, due to island conditions and the exposure times, we predicted the formation of Lepidocrocite γFeOOH, Goethite αFeOOH, Maghemite γFe 2 O 3, and Magnetite Fe 3 O 4 [ 43 ]. For galvanized steel, we predicted the products Zinc hydroxide Zn(OH) 2 and Zincite ZnO [ 44 ].…”

Section: Introductionmentioning

confidence: 99%

Atmospheric corrosion and impact toughness of steels: Case study in steels with and without galvanizing, exposed for 3 years in Rapa Nui Island

Vera

Valverde

Olave

et al. 2023

Heliyon

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A review of the atmospheric corrosion of zinc in outdoor and indoor atmospheres

Cited by 5 publications

References 30 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

Raman spectroscopy assisted with XRF and chemical simulation to assess the synergic impacts of guardrails and traffic pollutants on urban soils

Atmospheric corrosion and impact toughness of steels: Case study in steels with and without galvanizing, exposed for 3 years in Rapa Nui Island

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