The role of molybdenum in the crevice corrosion of stainless steels

Wanklyn, J.N.

doi:10.1016/0010-938x(81)90031-7

Cited by 132 publications

(58 citation statements)

References 44 publications

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“…Impedance diagram have a semicircular appearance; the diagram indicates that the corrosion of 304 SS is mainly controlled by a charge transfer process. 23 The values of double layer capacitance, C dl , decrease with increasing the concentration of coriander seeds extract. A low capacitance may result if water molecules at the electrode interface are replaced by inhibitor molecules of lower dielectric constant through adsorption.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 98%

Aqueous Extract of Coriander Seeds as Green Corrosion Inhibitor for 304 Stainless Steel in Hydrochloric Acid Solutions

Fouda¹,

Rashwan²,

Abo-Mosallam³

2014

Journal of the Korean Chemical Society

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ABSTRACT. Corrosion inhibition of 304 stainless steel (SS) in 1 M HCl by aqueous extract of coriander seeds was studied using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Values of inhibition efficiency obtained are dependent upon the concentration of extract and temperature. Generally, inhibition was found to increase with inhibitor concentration, but decrease with temperature. Physical adsorption mechanism has been proposed for the inhibition with Langmuir adsorption isotherm obeyed. Values of activation energy of the inhibited corrosion reaction of 304 SS are greater than the value obtained for the blank. Thermodynamic consideration reveals that adsorption of aqueous extract of coriander seeds 304 SS surface is spontaneous.

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Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 98%

Aqueous Extract of Coriander Seeds as Green Corrosion Inhibitor for 304 Stainless Steel in Hydrochloric Acid Solutions

Fouda¹,

Rashwan²,

Abo-Mosallam³

2014

Journal of the Korean Chemical Society

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“…Considerando las diferencias en la composición entre las aleaciones (Tabla I), se corrobora el efecto protector del molibdeno frente a la corrosión inducida por biopelículas en aguas residuales urbanas. Este elemento mejora las propiedades de los aceros inoxidables austeníticos en muchos aspectos: mejora su respuesta mecánica, reduce la rotura de la pasividad, especialmente en medios ricos en cloruro, e incrementa la resistencia a la corrosión por picadura y por grietas o fisuras en distintos medios [44][45][46][47][48][49][50] . Por otro lado, el molibdeno ayuda al cromo presente en el acero inoxidable a formar la capa pasiva [51] y previene la despasivación dentro de las grietas o fisuras [52] .…”

Section: Resistencia a La Corrosión De Las Diferentes Aleaciones De Aunclassified

Efecto de la biopelícula en la corrosión de aceros inoxidables

et al. 2010

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ResumenEn este trabajo se ha estudiado la influencia de las biopelículas en los procesos de corrosión de diferentes aleaciones de acero inoxidable, situadas durante 4 años en dos puntos de una estación depuradora de aguas residuales. Se caracterizó el microambiente físico-químico en el interior de las biopelículas mediante microelectrodos de O 2 , H 2 S y pH, y se cuantificaron las tasas de corrosión a partir del número, diámetro y profundidad de picadura. Los resultados obtenidos muestran un desarrollo más notable de las biopelículas y un número de picaduras significativamente mayor en el canal de salida de desbastes que en el canal de recirculación de fangos. Con base en las características del agua sobrenadante y en las medidas realizadas con microelectrodos, se sugiere que la biopelícula induce la corrosión a través de tres posibles mecanismos: creación de celdas de aireación diferencial, zonas con diferente pH y zonas con elevada producción de sulfuro capaz de reaccionar con iones metálicos. Palabras claveBiopelículas; Biocorrosión; Acero inoxidable; Microelectrodos; Sulfuro. Effect of biofilm in the corrosion of austenitic stainless steels in wastewater treatment plants AbstractIn this work, the influence of the biofilms in the corrosion process of different alloys of stainless steel was studied in two sampling points in a wastewater treatment plant during 4 years. The physicochemical microenvironment within the biofilms was characterized through O 2 , H 2 S and pH microelectrodes. Corrosion rates were quantified from the number, diameter and depth of pits. The results show a remarkable development of the biofilm and a significantly greater number of pits in the grit removal channel than in the sludge recirculation channel. Based on the characteristics of the water phase and microelectrode measurements, our results suggest that biofilms induced corrosion throughout 3 mechanisms: creation of differential aeration cells, areas with different pH and areas having high sulphide production which may react with metal ions.

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“…The technological importance and wide range of applications of austenitic stainless steels have led to extensive investigations of these materials. It is known [5,6] that the addition of Mo to austenitic stainless steels improves thrir properties in many aspects. These include improvements in mechanical performance, reduction in passivity breakdown, especially in chloride-containing media and increase in the pitting resistance and imparting good resistance to crevice corrosion.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behaviour of Mo‐containing austenitic stainless steels in buffer solution

Heakal

Ameer

El-Aziz

et al. 2004

Materialwissenschaft Werkst

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The effect of pH on the electrochemical behavior of austenitic stainless steels in naturally aerated and nitrogen-deaerated buffer solutions has been studied.Potentiodynamic and ac impedance techniques were used. The results indicate that corrosion current (I corr ) decreases with pH. By examining the impedance data for the seven tested steels under various conditions, it seems that the total resistance (R T ) value is a suitable indication parameter for explaining the role of molybdenum and the other supplementary alloying additions (Ni, N, Cu and Mn) on the passive film behaviors as a function of pH of the forming solutions. As a general trend, the R T values for all steels tended to be lower in the basic buffer than in the acidic solutions.

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The role of molybdenum in the crevice corrosion of stainless steels

Cited by 132 publications

References 44 publications

Aqueous Extract of Coriander Seeds as Green Corrosion Inhibitor for 304 Stainless Steel in Hydrochloric Acid Solutions

Aqueous Extract of Coriander Seeds as Green Corrosion Inhibitor for 304 Stainless Steel in Hydrochloric Acid Solutions

Efecto de la biopelícula en la corrosión de aceros inoxidables

Electrochemical behaviour of Mo‐containing austenitic stainless steels in buffer solution

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