Electrochemical corrosion monitoring of galvanized steel under cyclic wet–dry conditions

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

doi:10.1016/s0010-938x(99)00057-8

Cited by 123 publications

(45 citation statements)

References 10 publications

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“…The treatment's objective was to simulate atmospheric corrosion as in the working environment of the wall and roof panel system. The specimen was immersed in SAR solution for an hour, and was removed from the solution then allowed to dry in open air environment with exposure to sunlight for 7 hours a day [10][11][12][13][14]. Figure 3 shows a specimen which is immersed in the SAR solution and allowed to be died in open-air environment.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, the AC impedance technique or EIS method could be used to study an intrusion of water and ions into organic coatings for comparing performance of various inorganic coatings or surface treatments. The EIS method could also be produced models of the solution/inorganic coating/metal system and thus yield mechanistic information about the protective system [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Lifetime Estimation for Metal Sheet Cladding and Roofing in Wang-Noi Combined Cycle Power Plant

Suvanjumrat

Rugsaj

2016

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Abstract. This research aimed to study corrosion behavior and evaluated lifetime of the metal sheet cladding and roofing when exposed to actual usage environment using electrochemical impedance spectroscopy (EIS) test method. The sample plates were galvanized steel grade 550 and thickness of 0.6 mm which was coated with 55% of Al-Zn and a polyvinylidene fluoride layer which were prepared for metal sheet cladding and roofing of Wang-Noi combined cycle power plant in Phra Nakhon Si Ayutthaya province of Thailand. The specimens were tested under wet-dry cyclic condition by immersing in the simulated acid rain solution for an hour, then the specimen was removed from the solution and allowed to dry in open air environment with exposing to sunlight for 7 hours a day. The wet-dry cyclic treatment was repeated 3 times a day which was considered as the severe usage condition therefore the 3 wet-dry cycles might lead to extreme corrosion due to raining about 3 times a day. The EIS was used to evaluate the corrosion rate of specimens after the wet-dry cyclic treatment. Analysis results were expressed in Bode and Nyquist plot and used to calculate for corrosion current by using Stern-Garry equation which was used to calculate corrosion rate by using Faraday's law. The first order polynomial regression was appropriate to estimate corrosion rate beyond the real time usage of the metal sheet, and total mass loss over time was estimated by integrating the polynomial regression model to obtain the governing equation of the total mass loss of the cladding and roofing sheet in the usage environment. The evaluated mass loss over 20 years of usage under severe condition was estimated which had the maximum penetration of 1.04004 milli-inch and could be converted into penetrating thickness of 26.41 m.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lifetime Estimation for Metal Sheet Cladding and Roofing in Wang-Noi Combined Cycle Power Plant

Suvanjumrat

Rugsaj

2016

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“…The technique possesses the great advantage of detecting and quantifying the localized anodic and cathodic distribution on the surface of the metal which is a remarkable value for corrosion research [15][16][17][18][19][20]. This technique has been used in various research and development work to investigate the corrosion activities on zinc rich coatings.…”

Section: Evaluation Of Anodic and Cathodic Activities Scanning Vibratmentioning

confidence: 99%

Benchmarking of Zinc Coatings for Corrosion Protection: A Detailed Characterization of Corrosion and Electrochemical Properties of Zinc Coatings

Wijesinghe¹,

Tan²

2017

Corrosion Science and Technology

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Due to various types of Zn coatings for many decades for various applications, it is imperative to study and compare their corrosion resistance properties of some of these. Here, we introduce a systematic methodology for evaluation and validation of corrosion protection properties of metallic coatings. According to this methodology, samples are were exposed in an advanced cyclic corrosion test chamber according to ISO 14993, and removed at the end of each withdrawal for respective corrosion and electrochemical characterization to evaluate both barrier and galvanic protection properties. Corrosion protection properties of coatings were evaluated by visual examination according to ISO 10289, mass loss and subsequent corrosion rate measurements, electrochemical properties, and advanced electrochemical scanning techniques. In this study, corrosion protection properties of a commercial zinc rich coating (ZRC) on AISI 1020 mild steel substrates were evaluated and benchmarked against hot dip galvanized (HDG). Results were correlated, and corrosion protection capabilities of the two coatings were compared. The zinc rich coating performed better than hot dip galvanized coating in terms of overall corrosion protection properties, according to the exposure and experimental conditions used in this study. It proved to be a suitable candidate to replace hot dip galvanized coatings for desired applications.

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“…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

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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.

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Electrochemical corrosion monitoring of galvanized steel under cyclic wet–dry conditions

Cited by 123 publications

References 10 publications

Lifetime Estimation for Metal Sheet Cladding and Roofing in Wang-Noi Combined Cycle Power Plant

Lifetime Estimation for Metal Sheet Cladding and Roofing in Wang-Noi Combined Cycle Power Plant

Benchmarking of Zinc Coatings for Corrosion Protection: A Detailed Characterization of Corrosion and Electrochemical Properties of Zinc Coatings

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

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