Zinc corrosion in simulated acid rain

Magaino, Shin’ichi; Soga, Masayasu; Sobue, Kazuharu; Kawaguchi, Akihiro; Ishida, Naoya; Imai, Hachiro

doi:10.1016/s0013-4686(99)00146-2

Cited by 47 publications

(30 citation statements)

References 26 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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“…El mismo comportamiento poseen los metales puros estudiados. Para el caso del zinc esta característica concuerda con lo que concluyó MAGAINO et al [9], ya que para el primer día de inmersión el pH de la solución de lluvia ácida simulada poseía valores aproximados a 3. MAGAINO et al [9] investigaron el comportamiento del zinc puro en una solución de lluvia ácida simulada y llegaron a la conclusión de que la velocidad de corrosión del zinc aumenta drásticamente para valores de pH aproximados a 3.…”

Section: Pérdida De Masa Por Inmersión Y Velocidad De Corrosiónunclassified

“…Uno de sus usos más frecuentes es el galvanizado para exteriores, el cual se encuentra afectado por la corrosión causada por la lluvia ácida, presentado en [8][9][10]. La lluvia no solamente moja la superficie metálica y aporta los electrolitos que provocan la corrosión, sino que también se encarga de renovar constantemente a los electrolitos presentes y lavar los productos de la disolución del metal.…”

Section: Introductionunclassified

Análisis de la resistencia a la corrosión en lluvia ácida simulada de lasaleaciones Zn-Sn

2015

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RESUMENEl zinc y el estaño, junto con las aleaciones Zn-Sn, son empleados en la industria como recubrimientos del acero frente a la corrosión. Uno de sus usos más frecuentes es el galvanizado para exteriores, el cual es afectado por la corrosión debido a la lluvia ácida.El objetivo del trabajo es evaluar el comportamiento electroquímico que presentan las aleaciones Zn-Sn, con respecto a los metales puros, en una solución acuosa de lluvia ácida simulada compuesta por 31,85 mg/L H 2 SO 4 , 15,75 mg/L HNO 3 , 21,25 mg/L NaNO 3 , 46,20 mg/L (NH 4 ) 2 SO 4 , 31,95 mg/L Na 2 SO 4 , 84,85 mg/L NaCl, con un pH entre 3,5 y 4,0, a temperatura ambiente (25ºC). Para ello, se emplearon probetas de aleaciones con diferentes porcentajes en peso de estaño (6, 10 y 50), y de los metales puros, solidificadas horizontalmente.Se tomaron muestras de cada estructura de grano revelada y se las desbastaron con papeles de SiC, de granulometría entre #60 y #1200. Posteriormente, se realizaron medidas de polarización potenciodinámica en una celda electroquímica convencional de tres electrodos y ensayos de inmersión. Cada probeta se examinó mediante microscopia óptica, antes y después de realizar los ensayos.De las curvas potenciodinámicas se observó para los cortes transversales, que a medida que aumenta el contenido de estaño en la aleación, los potenciales tienden a valores más nobles. A partir de los ensayos de inmersión se denotó que la estructura columnar de zinc y las aleaciones presentan una mayor pérdida de masa que las demás estructuras. Además, el zinc y las aleaciones presentaron la velocidad máxima de corrosión al primer día de inmersión, para todas las estructuras de grano. En las micrografías se evidenció que el zinc presentó corrosión generalizada.Palabras clave: Aleaciones Zn-Sn, Lluvia ácida, Corrosión. ABSTRACTZinc and tin, together with Zn-Sn alloys are used in industrial operations and steel coatings against corrosion. One of its most common uses is the galvanizing process for outdoor structures, which is affected by corrosion caused by acid rain.The aim of the study is to evaluate the electrochemical behavior of Zn-Sn alloys with respect to pure metals, in an aqueous simulated acid rain solution consisting of 31.85 mg/L H 2 SO 4 , 15.75 mg/L HNO 3 , 21.25 mg /L NaNO 3 , 46.20 mg/L (NH 4 ) 2 SO 4 , 31.95 mg/L Na 2 SO 4 , 84.85 mg/L NaCl, at a pH between 3,5 and 4,0, at room temperature (25°C). Zn-Sn alloys samples were used with different percentages of tin (6 wt. % Sn, 10 wt. % Sn and 50 wt. % Sn), and pure metals samples. The samples were obtained by horizontal directional solidification.Samples of each of the revealed structures were taken and roughed with papers of SiC, of grain size between # 60 and # 1200. Subsequently, potentiodynamic polarization essays were performed in a conventional three electrode electrochemical cell and immersion tests. Each ones was examined by optical microscopy, before

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“…2 were prepared using de-ionized water and analytical grade reagents [9]. The pH value of the solutions was adjusted to 3.5 and 4.5 using sulfuric acid and potassium hydroxide to simulate the acidic and nearly acidic rain respectively.…”

Section: Specimen Preparationmentioning

confidence: 99%

EIS study on 2024-T3 aluminum alloy corrosion in simulated acid rain under cyclic wet-dry conditions

Shi

Zhang²,

et al. 2005

Materials and Corrosion

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The wet-dry cycle corrosion processes of 2024-T3 aluminum alloys under different pH environments were investigated using electrochemical impedance (EIS) technique in conjunction with SEM method. The results show that, during the dry period of each cycle, the electrode potential was relatively stable and the corrosion processes can be studied using EIS technique. In the case of pH 3.5 and during the entire corrosion process, the Nyquist plot was composed of a high-frequency capacitive arc due to corrosion reaction and a low-frequency capacitive arc due to the formation of corrosion products layer, and the corrosion rate during the same cycle was almost the same. In the case of pH 4.5 and during the first several cycles, the Nyquist plot was composed of nearly only one capacitive arc due to the corrosion reaction, and the corrosion rate during the same cycle increased with time. Additionally, the EIS features of the entire corrosion processes of 2024-T3 aluminum alloy were interpreted theoretically.

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Zinc corrosion in simulated acid rain

Cited by 47 publications

References 26 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

Análisis de la resistencia a la corrosión en lluvia ácida simulada de lasaleaciones Zn-Sn

EIS study on 2024-T3 aluminum alloy corrosion in simulated acid rain under cyclic wet-dry conditions

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