Corrosion of galvanised steel under an electrolytic drop

Dubuisson, Emilie; Lavie, Philippe; Dalard, F.; Caire, Jean-Pierre; Szunerits, Sabine

doi:10.1016/j.corsci.2006.05.027

Cited by 41 publications

(21 citation statements)

References 16 publications

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“…It has led to the development of a great number of methods that estimate or measure surface wetness as a means of determining when corrosion may be possible or significant (i.e., time of wetness). Great advances have been made in understanding the relationship between the state of the electrolyte on a surface and the corrosion response under the cases of thin films [1][2][3] and macroscopic drops [4][5][6] at high humidity levels. Relatively little information is available regarding this relationship under aerosol-size deposits and at lower humidity levels, as could be expected on outdoor surfaces.…”

mentioning

confidence: 99%

Effect of Relative Humidity on Corrosion of Steel under Sea Salt Aerosol Proxies

Schindelholz

Risteen

Kelly

2014

J. Electrochem. Soc.

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This paper is the first of two that examine the relationship between relative humidity, the hygroscopic behavior of sea salt aerosol proxies, and the atmospheric corrosion of mild steel contaminated with them. Here, the association between the deliquescence phase transitions (solid-aqueous) of a single salt, NaCl, and the corrosion response of steel contaminated with this salt is examined. Specific focus is given to mechanisms that allow corrosion below the deliquescence relative humidity of NaCl (76% RH). Mild steel loaded with aqueous NaCl drops or crystals (9 μg · cm −2 ) was subjected to isohumidity exposures for up to 300 days. The resulting damage was quantified by optical profilometry. The corrosion chemistry that developed was identified using EDS and Raman spectroscopy. The wetting and drying of simulated corrosion chemistries were characterized by impedance measurements across an interdigitated electrode sensor. Taken together, these results show that corrosion can initiate by adsorbed water on NaCl crystals at as low as 33% RH. At 53% RH and above, attack proceeded at rates comparable to that observed above the deliquescence RH due to the development of hygroscopic corrosion chemistry. The governing role of the hygroscopic properties of this chemistry on attack rate and morphology is discussed.

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confidence: 99%

Effect of Relative Humidity on Corrosion of Steel under Sea Salt Aerosol Proxies

Schindelholz

Risteen

Kelly

2014

J. Electrochem. Soc.

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“…Some researchers introduced wet–dry cycled experiments to more‐closely imitate actual atmospheric corrosion course 6–8. Atmospheric corrosion research studies have also used electrolyte droplets to simulate the local environment 9, 10.…”

Section: Introductionmentioning

confidence: 99%

Corrosion dependence of an AlMgSi alloy under MgCl₂ solution drop on initial concentration and humidity

Zeng

2012

Materials & Corrosion

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The corrosion behavior of an Al–0.63Mg–0.28Si alloy under MgCl2 solution droplets with different initial concentration in environments of 33, 75, and 88% relative humidity (RH) was studied using a Kelvin probe. The available cathodic limiting current associated with oxygen reduction was highly dependent on the environment RH and initial concentration. In the 33% RH environment, metastable pitting was the main form of corrosion. In some cases at 75 and 88% RH, the potential baseline decreased slowly by hundreds of mV and remained at the lower value, indicating stable filiform‐like corrosion grew. The initiation time of the stable corrosion was determined by the environment RH and initial concentration. With increasing initial concentration or decreasing environment RH, the available cathodic limiting current decreased, stable corrosion was difficult to occur. The stable corrosion could occur outside the drop and/or inside the drop, which was dependent on not only the cathodic limiting current but also the environment RH.

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“…Here RSM was used in conjunction with the droplet measurement technique [2,3] in an electrochemical micro cell to obtain the empirical model of interest.…”

Section: Introductionmentioning

confidence: 99%

“…Numerical modelling of corrosion phenomena is thus particularly interesting as it allows forecasting the life time of vehicles and helping the development of better bodywork designs [1]. We recently described an original experimental method to study the local corrosion rate of galvanised steel [2]. Localised measurements were achieved through the controlled deposition of an electrolyte droplet onto the sample, where reference and counter electrodes were incorporated forming an electrochemical micro cell [3].…”

Section: Introductionmentioning

confidence: 99%

Use of experimental design to empirically model atmospheric corrosion of galvanised steel

Dubuisson¹,

Szunerits²,

Caire³

et al. 2007

J Appl Electrochem

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International audienceElectrochemical impedance spectroscopy in 500-1100 μu m large liquid droplets containing chloride and sulphate ions has been used to investigate the local corrosion rate of galvanised steel. The objective was the empirical modelling of the corrosion rate as a function of temperature, electrolyte thickness, and chloride and sulphate concentrations. The first experiments showed that the corrosion time was one of the critical parameters; it was then included in the investigation. An empirical numerical model was obtained for steel and galvanised steel. The statistical model highlighted the respective importance of the five parameters on atmospheric corrosion and gave qualitative results in accordance with the literature. The statistical study also suggested that the corrosion potential was easier to model than corrosion currents

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Corrosion of galvanised steel under an electrolytic drop

Cited by 41 publications

References 16 publications

Effect of Relative Humidity on Corrosion of Steel under Sea Salt Aerosol Proxies

Effect of Relative Humidity on Corrosion of Steel under Sea Salt Aerosol Proxies

Corrosion dependence of an AlMgSi alloy under MgCl₂ solution drop on initial concentration and humidity

Use of experimental design to empirically model atmospheric corrosion of galvanised steel

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Corrosion of galvanised steel under an electrolytic drop

Cited by 41 publications

References 16 publications

Effect of Relative Humidity on Corrosion of Steel under Sea Salt Aerosol Proxies

Effect of Relative Humidity on Corrosion of Steel under Sea Salt Aerosol Proxies

Corrosion dependence of an AlMgSi alloy under MgCl2 solution drop on initial concentration and humidity

Use of experimental design to empirically model atmospheric corrosion of galvanised steel

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Product

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Corrosion dependence of an AlMgSi alloy under MgCl₂ solution drop on initial concentration and humidity