Cast iron deterioration with time in various aqueous salt solutions

Mehra, Rita; Soni, Aditi

doi:10.1007/bf02704595

Cited by 26 publications

(24 citation statements)

References 10 publications

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“…E-mail: kassiazzoug@gmail.com Overseas Foundry are in relation to the nucleation process and morphological transformations of graphite. The latter is dependent on the tensile strength of the cast iron (cracking sites) and the corrosion behavior in some corrosive environments [7,10,[19][20][21][22] .…”

Section: *M O Azzougmentioning

confidence: 99%

“…Mohebbi et al [25] found that localized corrosion (pitting) is the main form of corrosion in cast iron water pipes. Mehra et al [19] investigated the variation in corrosion rate and corrosion current density of gray cast iron as a function of immersion time in various salt solutions. These authors found that the NaCl solution is the most corrosive to cast iron.…”

Section: *M O Azzougmentioning

confidence: 99%

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Niobium addition effect in molds at last cooling step on EN-GJL250 gray cast iron: Microstructural changes and electrochemical behavior

et al. 2018

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I t is well established that the variety of applications of cast iron is attributed to the presence of chemical elements in the solid solution as interstitial or substitutional form, such as so-called addition elements Ni, Cu, Ti, Cr, V and Nb [1][2][3][4] , and inoculation elements Al, Si, Ca, Sr, Mn, Zr, P, Sn and Ce [5][6][7] .In the foundry, additions are done by controlling the Abstract:The purpose of this study was to determine the impact of niobium addition as an inoculation element on the microstructure and electrochemical properties of EN-FGL250 gray cast iron. Niobium additions are in a powder form and have a 0.5 mm particle size at dfferent proportions of 1wt.% and 3wt.%. The addition was done during casting of the metal in the mold at the last cooling step of the melt cast iron. These additions have a significant impact on the phenomenon of solidification as the metal powder deposited in the sand molds creates new centers of germination and absorbs a lot of heat. The cooling rate directly affects the microstructure and electrochemical behavior. This is confirmed by SEM observations and electrochemical tests. Furthermore, the addition of niobium transforms the microstructure of gray cast iron from cellular structure into totally dendritic structure. As a consequence, the niobium addition affected the shape and size of graphite, thus considerably reducing the corrosion current density by increasing the polarization resistance R p . chemical composition of the melt rather than equivalent carbon, alloying elements and inoculation products. The minor additions of alloying elements for their affinities to carbon can be used to improve the mechanical properties of the cast iron mainly by the formation of M 7 C 3 , M 3 C and MC type carbides. Filipovic et al. [4] have shown that variable proportions of additions of niobium and vanadium to the hypoeutectic white cast iron containing 19% chromium modify its microstructure and affect its wear and hardness properties. Kesseri et al. [3] have also shown that the addition of niobium in chromium-rich cast irons improves the mechanical properties by the formation of MC-type niobium carbides. Similarly, the inoculation elements have a strong affinity to oxygen and sulfur [8][9][10][11] . Thus, oxides and sulphides of a homogeneous or heterogeneous nature formed in the melt give the graphite nucleation sites [12][13][14] . Some authors suggested that the Mn/S ratio affects the nucleation and morphology of graphite [15,16] . Other authors [17,18] indicated that the inoculations elements *M. O. Azzoug Male, born in 1979, Teacher (assistant master) at University of Sciences and Technology Houari Boumedienne Algiers, Algeria, also Ph.D student in Materials Science and Engineering. He is currently working on the development of a surface treatment process for gray cast irons directly in the manufacturing stage of parts without resorting to conventional (physical or chemical) surface treatments by metal deposition process or surface treatment. The influence of additions in ...

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Section: *M O Azzougmentioning

confidence: 99%

Section: *M O Azzougmentioning

confidence: 99%

Niobium addition effect in molds at last cooling step on EN-GJL250 gray cast iron: Microstructural changes and electrochemical behavior

et al. 2018

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“…A lot of experimental studies of cast iron for practical use were conducted. [2][3][4][5][6][7][8][9] However, few reports on the basic corrosion mechanism of cast iron have been published. To elucidate mechanisms of corrosion of cast iron, intensive studies on each process are important.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Evolution Reaction on Spheroidal Graphite Cast Iron with Different Graphite Areas in Sulfuric Acid Solutions

et al. 2014

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The rate equation of hydrogen evolution reaction on spheroidal graphite cast iron which has different areas of graphite particles has been studied in sulfuric acid solutions at 298 K. The cathodic Tafel slope of −0.125 V/decade and the reaction order with respect to the activity of hydrogen ion of 1 are obtained by linear potential sweep technique. The cathodic current density due to hydrogen evolution reaction does not depend on the area of graphite particles. There is no difference in hydrogen evolution reaction mechanism between pure iron and spheroidal graphite cast iron.

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“…A lot of experimental studies of cast iron for practical use were conducted [1][2][3][4][5][6][7][8]. A form of corrosion unique to cast irons is a selective leaching attack commonly referred to as graphitic corrosion [9, page 89].…”

Section: Introductionmentioning

confidence: 99%

Anodic Dissolution of Spheroidal Graphite Cast Iron with Different Pearlite Areas in Sulfuric Acid Solutions

Miyata

Kuwahara

Asakura

et al. 2013

International Journal of Corrosion

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The rate equation of anodic dissolution reaction of spheroidal graphite cast iron in sulfuric acid solutions at 298 K has been studied. The cast irons have different areas of pearlite. The anodic Tafel slope of 0.043 V decade −1 and the reaction order with respect to the hydroxyl ion activity of 1 are obtained by the linear potential sweep technique. The anodic current density does not depend on the area of pearlite. There is no difference in the anodic dissolution reaction mechanisms between pure iron and spheroidal graphite cast iron. The anodic current density of the cast iron is higher than that of the pure iron.

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Cast iron deterioration with time in various aqueous salt solutions

Cited by 26 publications

References 10 publications

Niobium addition effect in molds at last cooling step on EN-GJL250 gray cast iron: Microstructural changes and electrochemical behavior

Niobium addition effect in molds at last cooling step on EN-GJL250 gray cast iron: Microstructural changes and electrochemical behavior

Hydrogen Evolution Reaction on Spheroidal Graphite Cast Iron with Different Graphite Areas in Sulfuric Acid Solutions

Anodic Dissolution of Spheroidal Graphite Cast Iron with Different Pearlite Areas in Sulfuric Acid Solutions

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