Effect of mixed salts on atmospheric corrosion of 304 stainless steel

Liya Guo; Na Mi; Mohammed-Ali Haval B.; Ghahari Majid; Andrew Du Plessis; Angus Cook; Steven Street; C. Reinhard; Robert C Atwood; Trevor Rayment; Alison Davenport

doi:10.1149/2.0021911jes

Effect of mixed salts on atmospheric corrosion of 304 stainless steel

Liya Guo, Na Mi, Mohammed-Ali Haval B., Ghahari Majid, Andrew Du Plessis, Angus Cook, Steven Street, C. Reinhard, Robert C Atwood, Trevor Rayment, Alison Davenport

Metallurgy and Materials

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Abstract

Atmospheric corrosion of stainless steel can take place when airborne salt particles deposit on the metal surface, formingdroplets when the relative humidity (RH) reaches a critical value: the deliquescence relative humidity of the salt. Most workto date has focused on single salts such as MgCl2 or NaCl. In the present work, the effect of mixed salts is investigated at 45% RH, above the deliquescence relative humidityof MgCl2 but below that of NaCl. Dish-shaped pits were found in pure MgCl2 solutions and mixed solutions. Crevice corrosion takes place under NaCl crystals. This is shown both with ex situ measurementsand in situ time-dependent measurements using X-ray microtomography, where pit growth was also monitored.

Original language	English
Pages (from-to)	C3010-C3014
Journal	Journal of the Electrochemical Society
Volume	166
Issue number	11
DOIs	https://doi.org/10.1149/2.0021911jes
Publication status	Published - 9 Jan 2019

Keywords

Corrosion
Atmospheric corrosion
Stainless Steel
X-Ray Diffraction

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Cite this

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title = "Effect of mixed salts on atmospheric corrosion of 304 stainless steel",

abstract = "Atmospheric corrosion of stainless steel can take place when airborne salt particles deposit on the metal surface, formingdroplets when the relative humidity (RH) reaches a critical value: the deliquescence relative humidity of the salt. Most workto date has focused on single salts such as MgCl2 or NaCl. In the present work, the effect of mixed salts is investigated at 45% RH, above the deliquescence relative humidityof MgCl2 but below that of NaCl. Dish-shaped pits were found in pure MgCl2 solutions and mixed solutions. Crevice corrosion takes place under NaCl crystals. This is shown both with ex situ measurementsand in situ time-dependent measurements using X-ray microtomography, where pit growth was also monitored.",

keywords = "Corrosion, Atmospheric corrosion, Stainless Steel, X-Ray Diffraction",

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T1 - Effect of mixed salts on atmospheric corrosion of 304 stainless steel

AU - Guo, Liya

AU - Mi, Na

AU - Haval B., Mohammed-Ali

AU - Majid, Ghahari

AU - Du Plessis, Andrew

AU - Cook, Angus

AU - Street, Steven

AU - Reinhard, C.

AU - Atwood, Robert C

AU - Rayment, Trevor

AU - Davenport, Alison

PY - 2019/1/9

Y1 - 2019/1/9

N2 - Atmospheric corrosion of stainless steel can take place when airborne salt particles deposit on the metal surface, formingdroplets when the relative humidity (RH) reaches a critical value: the deliquescence relative humidity of the salt. Most workto date has focused on single salts such as MgCl2 or NaCl. In the present work, the effect of mixed salts is investigated at 45% RH, above the deliquescence relative humidityof MgCl2 but below that of NaCl. Dish-shaped pits were found in pure MgCl2 solutions and mixed solutions. Crevice corrosion takes place under NaCl crystals. This is shown both with ex situ measurementsand in situ time-dependent measurements using X-ray microtomography, where pit growth was also monitored.

AB - Atmospheric corrosion of stainless steel can take place when airborne salt particles deposit on the metal surface, formingdroplets when the relative humidity (RH) reaches a critical value: the deliquescence relative humidity of the salt. Most workto date has focused on single salts such as MgCl2 or NaCl. In the present work, the effect of mixed salts is investigated at 45% RH, above the deliquescence relative humidityof MgCl2 but below that of NaCl. Dish-shaped pits were found in pure MgCl2 solutions and mixed solutions. Crevice corrosion takes place under NaCl crystals. This is shown both with ex situ measurementsand in situ time-dependent measurements using X-ray microtomography, where pit growth was also monitored.

KW - Corrosion

KW - Atmospheric corrosion

KW - Stainless Steel

KW - X-Ray Diffraction

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JF - Journal of the Electrochemical Society

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Effect of mixed salts on atmospheric corrosion of 304 stainless steel

Abstract

Keywords

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