Corrosion of graphite in industrial phosphoric acid

Guenbour, A.; Iken, Hicham; Kebkab, N.; Bellaouchou, A.; Boulif, Rachid; Bachir, A. Ben

doi:10.1016/j.apsusc.2005.12.075

Cited by 29 publications

(15 citation statements)

References 15 publications

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“…On the other hand, corrosion current densities increase with temperature (Table 4). This fact also confirms that temperature enhances the corrosion rate [2,4,19]. The increase in temperature increases the activity of the aggressive ions adsorbed on the surface, and consequently accelerates the dissolution process and the kinetics of exchange between the electrode surface and the electrolyte [17].…”

Section: Influence Of Impurities On the Corrosion Of Aisi 316l Sssupporting

confidence: 62%

“…More specifically, the most negative OCP values are those corresponding to the highest temperature analysed (see Figure 6). This may indicate that temperature favours the kinetics of corrosion reactions [1,2]. On the other hand, corrosion current densities increase with temperature (Table 4).…”

Section: Influence Of Impurities On the Corrosion Of Aisi 316l Ssmentioning

confidence: 99%

“…Some works have studied the effects of temperature on different materials in polluted phosphoric acid solutions under static conditions: graphite [2], stainless steels and graphite [17], austenitic stainless steels [18], mild steel [19] and Ti-Cu [20]. On the other hand, very few works have analysed the corrosion-erosion behaviour in polluted phosphoric acid media [4].…”

Section: Introductionmentioning

confidence: 99%

“…The recent trend to increase the concentration of the final product involves using higher operating temperatures. This fact, along with the hydrodynamic operating conditions prevailing in these plants, increases the severity of the corrosive environments [2][3][4][5] . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 3 Corrosion can be defined as the destruction or deterioration of a metallic material by reaction with its environment.…”

Section: Introductionmentioning

confidence: 99%

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Influence of temperature and hydrodynamic conditions on the corrosion behavior of AISI 316L stainless steel in pure and polluted H3PO4: Application of the response surface methodology

Sánchez-Tovar

Montañés

Garcı́a-Antón

et al. 2012

Materials Chemistry and Physics

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ElsevierSánchez Tovar, R.; Montañés Sanjuan, MT.; Garcia-Anton, J.; Abdellah; Guenbour, A. (2012). Influence of temperature and hydrodynamic conditions on the corrosion behavior of AISI 316L stainless steel in pure and polluted H3PO4: Application of the response surface methodology. Materials Chemistry and Physics. 133(1):289-298. doi:10.1016/j.matchemphys.2012.01.024 . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 AbstractThe cost associated with corrosion is an issue of major economic importance; controlling corrosion would promote the conservation of natural resources in relation to metals and save both energy and water. Phosphoric acid is mainly produced by the wet acid process, where corrosion problems could be intensified due to the presence of impurities in the phosphate rock. Operating temperatures and flowing conditions aggravate the aforementioned problems.This work studies the influence of temperature (25 to 60 ºC) and hydrodynamic conditions (Reynolds numbers from 1456 to 5066) on the corrosion of AISI 316L stainless steel in pure and polluted phosphoric acid solutions, by means of cyclic potentiodynamic polarization curves in a hydrodynamic circuit. The effect of temperature is the same as that caused by impurities; that is, higher corrosion rates and hindered passivation and repassivation resistance of the alloy. Statistical analysis by means of surface response methodology proved that the effect of temperature on the corrosion parameters of ASI 316L is more influential than the Reynolds number effect. The Reynolds number seems to have no significant 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2 influence on the corrosion behaviour of stainless steel. Furthermore, the influence of temperature on the corrosion rate is much higher than on the rest of the corrosion parameters analysed, especially in polluted phosphoric acid solutions. AISI 316L stainless steel has a clear interest for the phosphoric acid industry as a component material of some equipment due to its good corrosion properties at the different temperatures and Reynolds numbers studied even in polluted media. *Manuscript Click here to view linked References

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Section: Influence Of Impurities On the Corrosion Of Aisi 316l Sssupporting

confidence: 62%

Section: Influence Of Impurities On the Corrosion Of Aisi 316l Ssmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of temperature and hydrodynamic conditions on the corrosion behavior of AISI 316L stainless steel in pure and polluted H3PO4: Application of the response surface methodology

Sánchez-Tovar

Montañés

Garcı́a-Antón

et al. 2012

Materials Chemistry and Physics

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“…Several studies on the corrosion of various materials in phosphoric acid with addition of chemical ions [19,20] and solid particles (abrasion effect) [21] have been carried out in our laboratory, as well as measurements in industrial phosphoric acid to study the behaviour in a real and complex medium [22].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behaviour of a Highly Alloyed Austenitic Alloy UB6 in Contaminated Phosphoric Acid

Boudalia

Guenbour

Bellaouchou

et al. 2013

International Journal of Corrosion

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The influence of temperature ∘ C) on the electrochemical behaviour of passive films anodically formed on UB6 stainless steel in phosphoric acid solution (5.5 M H 3 PO 4 ) has been examined by using potentiodynamic curves, electrochemical impedance spectroscopy, and Mott-Schottky analysis. UB6 stainless steel in contaminated phosphoric acid is characterised by high interfacial impedance, thereby, illustrating its high corrosion resistance. The obtained results show that the films behave as n-type and p-type semiconductors in the potential range above and below the flat band potential, respectively. This behaviour is assumed to be the consequence of the semiconducting properties of the iron oxide and chromium oxide regions which compose the passive film.

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Preparation and Electrochemical Properties of Graphene‐Modified Electrodes for All‐Vanadium Redox Flow Batteries

et al. 2011

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The electrochemical properties of graphene make it an attractive material for use in a range of devices. We herein describe the simple preparation of graphene-modified graphite (GMG) composite electrodes by hybridization with graphite for all-vanadium redox flow batteries (VRB). The cyclic voltammetry (CV) results revealed that the use of GMG composite electrodes with an optimal graphene loading content (3 wt%) allowed remarkable improvements in terms of both the reversibility and the current density, which was up to 30 % higher than that of the pristine graphite electrode, and that an electrode of this type shows considerable potential for use in VRBs. , and the allvanadium redox flow battery (VRB). The last system is one of the more promising, thanks to its high storage capacity, its long life-cycle, its reliability and its high energy conversion efficiency [6][7]. The performance of the electrode of the VRB is still a key factor in the determination of the overall performance of the cell. The two redox couples of VO 2 + /VO 2 + and V 2 + /V 3 + are used for the positive and negative half-cell reactions, respectively. In comparison with the negative electrode, the positive redox couple of VO 2 + /VO 2 + sustains a relatively leisurely dynamic reaction, due to the rearrangement of the coordination structures of the vanadium ions [8], resulting in a significant influence on the performance of the cell. This rearrangement consists in the transfer of electrons, the exchange of protons, and the formation of a number of intermediate complexes, according to the pH of the electrolyte and the electrical potential [9]; hence, it is the positive half-cell reaction of the VRB that determines the electrochemical kinetic limitation. In consequence, the evolution of the electrodes plays an important role in the storage of energy. Various carbonaceous materials have been widely reported to have been used for the electrodes of VRBs, including polyacrylonitrile (PAN)-based graphite felt [10], carbon black [11], and carbon fiber [12].Graphene is a two dimensional (2-D) graphitic material in which the sp 2 -hybridized carbon atoms are arranged in a honeycomb lattice with a thickness of one atom. It has generated extensive scientific interest in a variety of technological fields [13,14]. In previous studies, a number of different authors have described the exceptional mechanical [15] [18], which may promote a higher rate of ionic adsorption, and may thereby enhance the electrochemical properties of any redox system in which it is used. Furthermore, the foregoing properties imply that graphene may be expected to be an excellent filler in graphite, thereby forming composite graphene-graphite electrodes. We herein describe the preparation of graphene-modified graphite (GMG) composite electrodes with various weight ratios of graphene to graphite. The electrochemical behavior and surface morphology of all samples were assessed using cyclic voltammetry (CV) and field-emission scanning electron microscopy (FE-SEM). We found that t...

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Corrosion of graphite in industrial phosphoric acid

Cited by 29 publications

References 15 publications

Influence of temperature and hydrodynamic conditions on the corrosion behavior of AISI 316L stainless steel in pure and polluted H3PO4: Application of the response surface methodology

Influence of temperature and hydrodynamic conditions on the corrosion behavior of AISI 316L stainless steel in pure and polluted H3PO4: Application of the response surface methodology

Corrosion Behaviour of a Highly Alloyed Austenitic Alloy UB6 in Contaminated Phosphoric Acid

Preparation and Electrochemical Properties of Graphene‐Modified Electrodes for All‐Vanadium Redox Flow Batteries

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