Atmospheric Corrosion

Roberge, P.R.

doi:10.1002/9780470872864.ch23

Cited by 14 publications

(7 citation statements)

References 21 publications

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“…The latter is particularly relevant in the present context because already in 1959 Markovic and Sevdic [9], and subsequently in 1966 Tomashov [20], proposed that corrosion in soils should share characteristics with atmospheric corrosion. This means that the ‘time of wetness’ (TOW), that is, the proportion of time the surface of a metal is sufficiently wet for corrosion to proceed is an important factor [21]. Its effect is shown, schematically, in Figure 1(b).…”

Section: Introductionmentioning

confidence: 99%

“…Its effect is shown, schematically, in Figure 1(b). For atmospheric exposures, TOW is related to the relative humidity of the atmosphere and to metal surface temperature [21]. For soils, TOW is expected to be related also to the water-holding capacity of a soil [9], as experimentally investigated for silt and sandy loams by Gupta and Gupta [22].…”

Section: Introductionmentioning

confidence: 99%

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A reinterpretation of the Romanoff NBS data for corrosion of steels in soils

Melchers

Petersen

2017

Corrosion Engineering, Science and Technology

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Data published in the 1957 Romanoff National Bureau of Standards report for the corrosion of steels buried in soils for up to 17 years are re-interpreted using the bi-modal model for corrosion in wet environments. The relevant soil properties are those of the backfill, not those of the undisturbed soil at the depth of the steel samples. Using estimated backfill properties shows that stiff clays, calcareous loams and gravelly loams corrosion transitioned from Mode 1 to Mode 2 after 4-8 years, following severe corrosion and deep pitting. For most other backfill soils, the transition occurred later and corrosion was less severe. These differences are attributed to the relative influence of differential aeration and localised corrosion caused by air-voids at the soil-metal interface. The declining rate of corrosion in the later part of Mode 2 is attributed to backfill consolidation decreasing the diffusion of oxygen and possibly also of moisture.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A reinterpretation of the Romanoff NBS data for corrosion of steels in soils

Melchers

Petersen

2017

Corrosion Engineering, Science and Technology

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“…7 Of particular attention has been the relative humidity at which primary contaminant salts deliquesce. [8][9][10][11] Deliquescence is the bulk phase transformation whereby a solid salt spontaneously absorbs water to form an aqueous electrolyte above a specific RH. The corresponding RH for this transformation to occur is the deliquescence RH (DRH).…”

Section: Introductionmentioning

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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“…External corrosion is usually quantified by monitoring atmospheric corrosivity factors such as relative humidity, temperature, time of wetness, and industrial pollutants (e.g., SO

, NO

) [ 2 , 3 ]. Others are based on weight loss measurements of coupons exposed to the environment.…”

Section: Introductionmentioning

confidence: 99%

Detection of Internal Metal Loss in Steel Pipes and Storage Tanks via Magnetic-Based Fiber Optic Sensor

Almahmoud

Shiryayev

Vahdati

et al. 2018

Sensors

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A monitoring solution was developed for detection of material loss in metals such as carbon steel using the force generated by permanent magnets in addition to the optical strain sensing technology. The working principle of the sensing system is related to the change in thickness of a steel plate, which typically occurs due to corrosion. As thickness decreases, the magnetostatic force between the magnet and the steel structure also decreases. This, in turn, affects the strain measured using the optical fiber. The sensor prototype was designed and built after verifying its sensitivity using a numerical model. The prototype was tested on steel plates of different thicknesses to establish the relationship between the metal thickness and measured strain. The results of experiments and numerical models demonstrate a strong relationship between the metal thickness and the measured strain values.

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Atmospheric Corrosion

Cited by 14 publications

References 21 publications

A reinterpretation of the Romanoff NBS data for corrosion of steels in soils

A reinterpretation of the Romanoff NBS data for corrosion of steels in soils

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

Detection of Internal Metal Loss in Steel Pipes and Storage Tanks via Magnetic-Based Fiber Optic Sensor

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