Initiation and Inhibition of Pitting Corrosion in Alkali Solutions under potentiostatic polarization conditions

Haleem, S. M. Abd El

doi:10.1002/maco.19790300905

Cited by 19 publications

(9 citation statements)

References 31 publications

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“…gives the same polarization curves as the solution free of aggressive anion. This indicates that ClO 4 anion does not interfere with the mechanism of passivity of the Pb electrode (Abd El Haleem, 1979;Abd El Haleem and Abd El Aal, 1982;Abd El Aal, 1999). A similar finding was reported during the study of the pitting corrosion of lead in NaOH by the author (Abd El Wanees et al, 1991a;.…”

Section: Resultssupporting

confidence: 77%

“…the dissolution current density along the active region increases with an increase in the concentration of ClO 4 -anion. This behaviour indicates that the ClO 4 anion is specifically adsorbed on the metal surface at lower potentials than those expected for the onset of passivity (Abd El Haleem, 1979;Abd El Haleem and Abd El Aal, 1982;Abd El Rehim et al, 1996);…”

Section: Resultsmentioning

confidence: 89%

“…However, the film dissolution is counterbalanced by film formation. The rate of these two processes is nearly the same at the steady state of polarization, so as to keep the thickness of the passive film nearly constant (Abd El Haleem, 1979;Abd el Haleem and Abd El Aal, 1982;Abd El Rehim et al, 1996, 1997Abd El Aal, 1999, 2000. X-ray diffraction analysis showed that the passive layer consists of PbO (Abd El Rehim et al, 1997).…”

Section: Resultsmentioning

confidence: 98%

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Studies on the pitting corrosion of lead in carbonate media

Aal

2001

Anti-Corrosion Methods and Materials

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Cyclic voltametry and potentiodynamic single sweep techniques are used to study the electrochemical behaviour of lead in Na2CO3 solutions containing various concentrations of ClO4‐ as aggressive anion. The effects of different concentrations, in terms of destruction of passivity and initiation of pitting corrosion, were monitored with reference to the change in integrated anodic charge. It was found that Δqa (taken as a measure of the extent of pitting) varies linearly with log CClO4‐. The pitting corrosion potential, Epitting, varies with log CClO4‐ according to sigmoidal curves. These curves are explained on the basis of formation of passive, active and continuously propagating pits. Additions of aliphatic amines shift the pitting corrosion potential, Epitting, into the noble (positive) direction, indicating the inhibition action of the added amines on the pitting attack. Epitting varies with the logarithm of the inhibitor concentration according to: Epitting = a + b log Cinh. The inhibition of pitting corrosion by the aliphatic amines is assumed to be due to either competitive adsorption between the CO32– with ClO4‐ anions, and/or the chemisorption of the amine on the metal with the formation of a metal‐nitrogen coordination bond. The efficiency of these compounds as pitting corrosion inhibitors increases with the increase in the chain length of the alkyl group.

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Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 98%

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Studies on the pitting corrosion of lead in carbonate media

Aal

2001

Anti-Corrosion Methods and Materials

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“…In this case, it can be concluded that these low concentrations of chloride are not sufficient to destroy completely the passivating film formed on the metallic surface. Also, the pits formed are not completely active and may undergo repassivation [3][4][5][6][7][8][9][10][11][12][13][14][15]. At higher concentrations of chloride ions the pits formed are assumed to be of the limiting active type.…”

Section: Resultsmentioning

confidence: 99%

Pitting Corrosion Inhibition of Some Copper Alloys in Neutral Solutions by Straight Chain Carboxylates

Mahmoud¹,

Ahmed²,

Marie³

et al. 2007

Port. Electrochim. Acta

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Electrochemical methods were used to investigate the abilities of the homologous straight chain monocarboxylates (C n H 2n+1 COO -,n=1-13) to inhibit the pitting corrosion of two types of copper alloys in aerated, saline and near neutral aqueous solutions. The copper alloys were alloy (I) (Cu + 4.47% Fe) and alloy (II) (Cu + 10.67% Al + 5.02% Fe). It was found that these were susceptible to pitting corrosion in NaCl solutions, with increase of Cl -ions concentration. Alloy (II) was more susceptible to pitting corrosion than alloy (I). The performance of monocarboxylates was shown to be critically dependent upon their chain length. The range of chain lengths producing optimal inhibition was (6 ≤ n ≤ 10). These carboxylates showed abrupt decreases in inhibitor ability outside the optimal range. The dramatic variations in inhibition efficiencies probably resulted from competing reactions such as adsorption, solubility and micelle formation.

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“…Pasivní vrstva na povrchu zinku je snadno poškozována přítomností chloridových aniontů, nebo naopak je její tvorba podporována přístupem CO 3 2- [46]. V prostředí 0,5 mol l -1 NaOH byla pozorována směsná skladba korozních produktů na povrchu zinku a zahrnovala ZnO, Zn(OH) 2 , Zn 5 (OH) 6 (CO 3 ) 2 .…”

Section: Vliv Vápenatých Kationtů Na Korozní Chování žáRově Zinkovanéunclassified

Influence of calcium cations on the corrosion behavior of hot-dip galvanized steel in model concrete pore solutions

Pokorný

Kouřil

2019

Koroze a Ochrana Materialu

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In this paper, the influence of calcium cations on the corrosion behavior of hot-dip galvanized steel in model concrete pore solutions is evaluated by means of conventional electrochemical methods (measurement of free corosion potencial and polarization resistance), surface analysis methods (optical and confocal microscopy) and XRD phase analysis of precipitated corrosion products. The results of these experiments confirm the conclusions of the current work on a similar topic, i.e. the crystalline calcium based corrosion products Ca[Zn(OH)3]2·2H2O are not able passivate effectively surface of hot-dip galvanized steel in model of concrete pore solutions (pH 12.6; 13.0). If passivation occurs, a mixed Ca[Zn(OH)3]2·2H2O, ZnO and Zn(OH)2 is involved.

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Initiation and Inhibition of Pitting Corrosion in Alkali Solutions under potentiostatic polarization conditions

Cited by 19 publications

References 31 publications

Studies on the pitting corrosion of lead in carbonate media

Studies on the pitting corrosion of lead in carbonate media

Pitting Corrosion Inhibition of Some Copper Alloys in Neutral Solutions by Straight Chain Carboxylates

Influence of calcium cations on the corrosion behavior of hot-dip galvanized steel in model concrete pore solutions

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