AC impedance study on corrosion of 55%Al–Zn alloy-coated steel under thin electrolyte layers

El-Mahdy, Gamal A.; Nishikata, Atsushi; Tsuru, Tooru

doi:10.1016/s0010-938x(00)00009-3

Cited by 101 publications

(44 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A testing method including dry and wet processes in addition to saltspraying process has been proposed by Sakumoto et al 10) Furthermore, Nishikata et al discussed the corrosion mechanisms of 55% Al-Zn coating in dry and wet test using NaCl solution by means of a monitoring method. 11) The atmospheric corrosion test environment contains exposure to solution of not only NaCl but also various salts. Therefore, various testing methods using artificial seawater have been proposed in order to simulate atmospheric corrosion.…”

Section: Introductionmentioning

confidence: 99%

Effect of Environmental Conditions on the Corrosion near Shear Cut Edge of 55 mass% Al–Zn Alloy Coated Steel Sheets

Matsumoto¹,

Okada²,

Nishihara³

et al. 2011

ISIJ Int.

View full text Add to dashboard Cite

The purpose of this study is to clarify the effect of dry and wet processes on the mechanisms of edge corrosion of hot dip 55 mass% Al-Zn alloy coated steel sheet. The corrosion tests employed were continuous salt-spray tests and cyclic corrosion tests using NaCl solution or artificial seawater. It was confirmed that the edge corrosion is suppressed during the salt-spray test using artificial seawater. Furthermore, the suppression was not prevented by dry and wet processes. In order to reveal the corrosion mechanisms, the galvanic current and the cathodic polarization curves at exposed steel were measured and the corrosion products were characterized. It is suggested that the artificial seawater forms anti-corrosive corrosion products and that suppress the cathodic reaction on the steel which is exposed on the shear cut edge. The corrosion products are not changed by dry and wet processes. The numerical analysis also revealed the influence of the dry and wet process on edge corrosion.KEY WORDS: 55 mass% Al-Zn alloy coated steel sheet; edge corrosion; artificial seawater; salt-spray test; dry and wet processes; numerical analysis; X-ray diffractometry (XRD); Fourier transform infrared spectroscopy (FTIR)

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Environmental Conditions on the Corrosion near Shear Cut Edge of 55 mass% Al–Zn Alloy Coated Steel Sheets

Matsumoto¹,

Okada²,

Nishihara³

et al. 2011

ISIJ Int.

View full text Add to dashboard Cite

show abstract

“…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.

View full text Add to dashboard Cite

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.

show abstract

“…Electrochemical impedance spectroscopy (EIS) has proven to be an effective technique for monitoring the corrosivity of haze and related mechanisms of steel. Nishikata et al [29][30][31][32][33][34][35][36] used EIS to study the corrosivity of atmosphere to different types of steels, and the effects of electrolyte concentration and pH value on the atmospheric corrosivity of metal were also studied. EIS was used to study the atmospheric corrosion of steel under an electrolyte film in wet-dry cycles by Dong et al 37 Leygraf et al [38][39][40] used situ X-ray transmission spectromicroscopy, infrared reflection absorption spectroscopy (IRAS) and a quartz crystal microbalance to investigate the atmospheric corrosivity of metals.…”

Section: Introductionmentioning

confidence: 99%

Sensing the Instant Corrosivity of Haze Using Electrochemical Probes by Electrochemical Noise Technique

Ma¹,

Xia²,

Zhang³

et al. 2017

Electrochemistry

View full text Add to dashboard Cite

Electrochemical noise (EN) was used to study the corrosivity of haze under Tianjin's urban atmosphere by using two electrochemical corrosion probes made by T91 and Q235B steels. Experimental results indicate that temperature, relative humidity and concentrations of pollutants (PM10, PM2.5, SO 2 , NO 2 and O 3 ) can affect the corrosion of T91 and Q235B atmospheric corrosion monitoring probes. However, the atmospheric humidity has a major effect on corrosion activities. The corrosivity of haze under low temperature and high relative humidity has a high level, which can promote the corrosion of T91 and Q235B probes; the effect of atmospheric pollutant concentration on atmospheric corrosivity is not apparent due to theirs low concentrations. T91 probe is suitable for long term corrosion monitoring, while Q235B probe is suitable for short time monitoring and has high detection precision.

show abstract

AC impedance study on corrosion of 55%Al–Zn alloy-coated steel under thin electrolyte layers

Cited by 101 publications

References 7 publications

Effect of Environmental Conditions on the Corrosion near Shear Cut Edge of 55 mass% Al–Zn Alloy Coated Steel Sheets

Effect of Environmental Conditions on the Corrosion near Shear Cut Edge of 55 mass% Al–Zn Alloy Coated Steel Sheets

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

Sensing the Instant Corrosivity of Haze Using Electrochemical Probes by Electrochemical Noise Technique

Contact Info

Product

Resources

About