The influence of halide ion concentration on the effects of surface active inhibitors in strong electrolytes

Kirkov, P.

doi:10.1016/s0010-938x(73)80008-3

Cited by 8 publications

(4 citation statements)

References 23 publications

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“…There are also indications that higher sulfate/chloride ionic ratio is needed to inhibit the pitting corrosion of stainless steels at higher chloride concentrations [12].Stainless steel 316L are prone to localised corrosion attack or pitting corrosion in seawater compared to high suphate content of seawater. Non halide anions such as sulphate (~0 4~3 can reduce risk to pitting in chloride containing solutions.…”

Section: Discussionmentioning

confidence: 99%

Corrosion Behavior of Austenitic Stainless Steel in High Sulphate Content

Ismail

2014

AMR

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Abstract. Austenitic stainless steels especially 316L has been used extensively in many sectors including construction, medical and household appliances due to their highly resistance to corrosion attack, reasonable cost and excel in mechanical properties. However, in corrosive media, 316L are susceptible to localised corrosion attack especially in seawater and high temperature. The corrosiveness of media increased as the anions contents increased. This paper presents the corrosion mechanism of 316L exposed to high concentration of sulphate in the salinity of seawater. The solution (media) was prepared according to the same composition as seawater including pH, salinity and dissolved oxygen. The corrosion mechanism were characterized to breakdown potential (Eb) of 31 6L which are the potential once reaches a sufficiently positive value and also known as pitting potential. This is the most point where localized corrosion susceptibility to evaluate and considered a potential, which could be an appropriate point according to any given combination of rnateriaUambient/testing methods. The Eb value were identified at 4OC, 20°C, 50°C and 80°C and compared with Eb value of 3 16L in seawater. The Eb value of 3 16L in high sulphate are higher compared to seawater in every temperature which elucidate that some anions accelerate corrosion attack whereas some anions such as sulphate behaves as inhibiting effect to 3 16L. IntroductionStainless steels (SS) have been widely used in industrial components for decades especially austenitic stainless steel 31 6L due to their well-documented resistance to corrosion but yet, stainless steel still suffers for corrosion attack especially in corrosive media such as seawater. Corrosion of SS in seawater is dependent mainly on the salt content (which increase the electrical conductivity) and its oxygen content. A number of variables can influence and complicate the course of corrosion in different ways such as chloride, sulphate and temperature.In the context of corrosion, SS are characterized by their passivity. Under certain conditions, steel is passive, where the corrosion rate for the metal is relatively low. Iron is considered an activepassive metal and, therefore, steel behaves similarly. Passivity can be defined as the loss of chemical reactivity under certain conditions [I]. Steel achieves this by having a passive film form along its surface. The passive film was formed by reaction of chromium with oxygen to produce chromium oxide as a protection from surrounding. Therefore, the characterisation of SS is according to the minimum 10.5% wt% Cr (Chromium) addition to iron [2]. For most SS, the maximum chromium content is about 30% and the minimum iron content is 50%. The stainless characteristic arises from the formation of an invisible and very adherent chromium-rich oxide surface film. This puts the steel in a passive state and when the film is breached, it immediately heals when oxygen is present. It is highly corrosion resistant and shows little or no corrosion if the passive fil...

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Section: Discussionmentioning

confidence: 99%

Corrosion Behavior of Austenitic Stainless Steel in High Sulphate Content

Ismail

2014

AMR

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“…46 The inhibition of iron corrosion by halide ions has been reported to be caused by the adsorption on the electrode surface and by the formation of surface compounds which are insoluble in the corrosive media. [47][48] The inhibition behaviour of I -ions at lower concentrations is mainly due to the strong adsorption of these ions on the electrode surface at E corr . 49 The adsorption ability of halide ions on the iron surface has been estimated in the order 2, 50-52 I -> Br -> ClGenerally the adsorbability of anions is related to the degree of hydration; the less hydrated ion is preferentially adsorbed on the electrode surface.…”

Section: Bromide Ionsmentioning

confidence: 99%

Corrosion inhibition of iron in 0.5 mol L-1 H2SO4 by halide ions

Jeyaprabha¹,

Sathiyanarayanan²,

Muralidharan³

et al. 2006

J. Braz. Chem. Soc.

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O efeito de inibição de íons haletos, tais como iodeto, brometo e cloreto, na corrosão de ferro em solução 0,5 mol L -1 de H 2 SO 4 , e o comportamento da adsorção desses íons na superfície do eletrodo, foram estudados pelos métodos de polarização e de impedância. Foi observada uma inibição de aproximadamente 90% para íons iodeto a 2,5 × 10 -3 mol L -1 e para íons brometo a 10 × 10 -3 mol L -1 , e de 80% para íons cloreto a 2,5 × 10 -3 mol L -1 . O efeito da inibição aumenta com o aumento da concentração dos íons haletos I -e Br -, mas decresce no caso do Cl -, para concentrações maiores que 5 ×10 -3 mol L -1 . Os valores de capacitância de dupla camada diminuíram consideravelmente na presença dos íons haletos, o que indicou que esses ânions são adsorvidos no ferro no potencial de corrosão.The inhibition effect of halide ions such as iodide, bromide and chloride ions on the corrosion of iron in 0.5 mol L -1 H 2 SO 4 and the adsorption behaviour of these ions on the electrode surface have been studied by polarization and impedance methods. It has been found that the inhibition of nearly 90% has been observed for iodide ions at 2.5 × 10 -3 mol L -1 , for bromide ions at 10 × 10 -3 mol L -1 and 80% for chloride ions at 2.5 × 10 -3 mol L -1 . The inhibition effect is increased with increase of halide ions concentration in the case of I -and Br -ions, whereas it has decreased in the case of Cl -ion at concentrations higher than 5 × 10 -3 mol L -1 . The double layer capacitance values have decreased considerably in the presence of halide ions which indicate that these anions are adsorbed on iron at the corrosion potential. Keywords: corrosion inhibition, iron, sulphuric acid, halide ions IntroductionAdsorption of anions over metal surfaces leading to the inhibitive or stimulation effects on metallic corrosion have been reported by earlier researchers. [1][2][3][4][5][6] It is well known that the dissolution of iron in H 2 SO 4 solutions occurs in four different states viz. active, passive, transpassive and brightening states as determined by the nature and kinetics of reaction involved, which depend on the potential and electrolyte composition. Combined adsorption of anions and cations together on the surface have also been studied. Electrostatic interaction is the main reason for the specific adsorption of anions on metal surface. 7,8 Possibility of chemisorption of the anions on metal by the formation of a covalent type bond is also suggested by Grahame. 9 Quantum chemical calculations have been used to describe the chemisorption of the halide ions on the metal electrode surface by the formation of partial charge transfer bonds. 10 Pearson suggested that the stability of the anion adsorption bond over metal surface should resemble to hard and soft acids and bases principle if the adsorption occurs by forming a donoracceptor type bond. 11,12 The specific adsorption behaviour of some of the anions on metal electrode surface and their effects on corrosion have been qualititatively related to this HSAB principle. 13,14 ...

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“…The inhibition of mild steel corrosion by halide ions has been reported to be caused by the adsorption on the metal surface and by the formation of surface compounds which are insoluble in the corrosive media 43, 44. The adsorption ability on the metal surface and hence inhibition potential of the halides has been estimated in the order I − > Br − > Cl − 45, 46.…”

Section: Resultsmentioning

confidence: 99%

Synergistic effect of halide ions and polyethylene glycol on the corrosion inhibition of aluminium in alkaline medium

Umoren

Ebenso

Ogbobe

2009

J of Applied Polymer Sci

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ABSTRACT:The corrosion inhibition of aluminium in alkaline medium was studied at 30 and 40 C in the presence of polyethylene glycol (PEG) using gravimetric (weight loss) and thermometric techniques. The effect of halides (KCl, KBr, and KI) on the inhibitory action of PEG was also studied. It was found that PEG acted as inhibitor for aluminium corrosion in the alkaline medium. Inhibition efficiency increased with increasing inhibitor concentration. An increase in temperature led to increase in both the corrosion rate and inhibition efficiency in the absence and presence of inhibitor and halides. Phenomenon of chemical adsorption mechanism is proposed from the values of E a , Q ads , and DG o ads obtained. The adsorption of PEG on the surface of aluminium was found to obey Flory-Huggins and Temkin adsorption isotherms. The synergism parameter, S 1 evaluated was found to be greater than unity indicating that the enhanced inhibition efficiency caused by the addition of halides is synergistic in nature. The inhibition efficiency, surface coverage and synergism parameter increased in the order;showing that a joint adsorption of PEG and halide ions on aluminium plays a significant role in the adsorption process.

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The influence of halide ion concentration on the effects of surface active inhibitors in strong electrolytes

Cited by 8 publications

References 23 publications

Corrosion Behavior of Austenitic Stainless Steel in High Sulphate Content

Corrosion Behavior of Austenitic Stainless Steel in High Sulphate Content

Corrosion inhibition of iron in 0.5 mol L-1 H2SO4 by halide ions

Synergistic effect of halide ions and polyethylene glycol on the corrosion inhibition of aluminium in alkaline medium

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