Action of Polar Organic Inhibitors in Acid Dissolution of Metals

Hackerman, Norman; Makrides, A. C.

doi:10.1021/ie50531a038

Cited by 176 publications

(64 citation statements)

References 30 publications

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“…In addition to the abovementioned compounds, two sulfur-containing compounds, namely sulfolane and thiosalicylic acid, were also chosen since they were reported to be effective due to their superior electron-donating ability compared to nitrogen and oxygen [10][11][12]. Sulfolane is a heterocyclic compound with a sulfonyl reaction center.…”

Section: Corrosion Inhibitors Principles and Recent Applications 228mentioning

confidence: 99%

Screening and Evaluating Environmentally-Friendly Corrosion Inhibitors for Amine-Based CO2 Absorption Process

Srinivasan¹,

Veawab²,

AdisornAroonwilas³

2018

Corrosion Inhibitors, Principles and Recent Applications

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This chapter evaluated the performance of environmentally friendly organic corrosion inhibitors on carbon steel in the amine-based carbon dioxide (CO 2 ) absorption process. The evaluation was experimentally conducted using electrochemical techniques in 5.0 kmol/m 3 monoethanolamine (MEA) solutions in the absence and presence of process contaminants, namely formate and chloride, at 80°C and 0.55 mol/mol CO 2 loading. The results show, in the absence of process contaminants, that 2-aminobenzene sulfonic acid, 3-aminobenzene sulfonic acid, 4-aminobenzene sulfonic acid, sulfapyridine, and sulfolane yielded 85-92% corrosion inhibition efficiencies, while sulfanilamide yielded the lowest efficiency of 20-42%. Sulfolane was the only tested inhibitor whose performance could be maintained in chloride-and formate-containing MEA solutions. On the contrary, the performance of 3-aminobenzene sulfonic acid and sulfapyridine was decreased by chloride. The performance of all the tested aminobenzene sulfonic acids was compromised by formate.

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Section: Corrosion Inhibitors Principles and Recent Applications 228mentioning

confidence: 99%

Screening and Evaluating Environmentally-Friendly Corrosion Inhibitors for Amine-Based CO2 Absorption Process

Srinivasan¹,

Veawab²,

AdisornAroonwilas³

2018

Corrosion Inhibitors, Principles and Recent Applications

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“…Each of them seemed to be constant for the uninhibited and inhibited electrodes. The inhibition efficiency, It, which is defined by It1-ot lcorr Z corr (1) where icorr and icorr are the corrosion currents for the inhibited and uninhibited electrodes, respectively, was shown in Figs. 1 to 3 as the function of the inhibitor concentration, C.…”

Section: Resultsmentioning

confidence: 99%

Semi-Quantitative Evaluation of Steric Effect on Corrosion Inhibition Efficiency of Branched Alkyl Amines

Aramaki

1977

Corrosion Engineering

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Steric effects of branched alkyl chains on the inhibition efficiency of amine inhibitors for the acid corrosion of iron were studied. Corrosion rates were determined on a pure iron electrode in 6.1M HCl solutions with and without the inhibitors at 30C by polarization measurements. The inhibitors adopted were monoalkyl amines (I), N-ethyl alkyl amines (II), and N dimethyl alkyl amines (III), of which alkyl groups are branched and unbranched chains. The inhibition efficiency of I and II decreased with an increase in the degree of branching of the alkyl group in the orders, n-butyl>isopropyl group, and n-butyl>isobutyl>sec-butyl>tert-butyl group. However, the efficiency for III decreased in the order, sec-butyl>tert-butyl>isobutyl>n-butyl group. The polarization data were semi-quantitatively analyzed in connection with the molecular coverage areas, the polar and steric substituent constants, and the basicity constants. The steric effect of the branched chain on the adsorption of the free amine increased with increasing the degree of the branching, resulting in lowering the inhibition efficiency for the anodic partial reaction. Further, this effect was enhanced in the order from I to II and markedly to III. The inhibition efficiency of III for the cathodic partial reaction increased with the degree of the branching in the alkyl group. This increase in the efficiency is attributed to the low hydration number for cations of III by the steric hindrance of the branched chain.

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“…Among numerous organic compounds the amines and heterocyclic compounds of nitrogen are of special interest. Their effectiveness as corrosion inhibitors IS a result of adsorptive properties (9)(10)(11)(12)(13).…”

Section: Discussionmentioning

confidence: 99%

Influence of Toluidines and Acridine Derivatives on Corrosion of 63/37 Brass in Nitric Acid Solution

Patel¹,

Patel²

1975

Materials & Corrosion

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Among the inhibitor studied – o‐, m‐and p‐toluidines, acridine, phenazine and xanthine ‐ o‐toluidine and acridine have turned out to be excellent inhibitors of the corrosion of brass in nitric acid. As to the toluidine series the inhibiting power of the ortho isomer is superior to that of the para isomer. On the base of the results obtained the following order of efficiency may be established ‐ o‐toluidine ‐ p‐toluidine ‐ m‐toluidine ‐ acridine ‐ xanthine ‐ phenazine. The efficiency is probably due to the elimination of nitrous acid (by diazotization) and to adsorption of onium type ions at a metal surface. NH2 groups give rise to an activation of all the positions in the cyclic molecule.

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Action of Polar Organic Inhibitors in Acid Dissolution of Metals

Cited by 176 publications

References 30 publications

Screening and Evaluating Environmentally-Friendly Corrosion Inhibitors for Amine-Based CO2 Absorption Process

Screening and Evaluating Environmentally-Friendly Corrosion Inhibitors for Amine-Based CO2 Absorption Process

Semi-Quantitative Evaluation of Steric Effect on Corrosion Inhibition Efficiency of Branched Alkyl Amines

Influence of Toluidines and Acridine Derivatives on Corrosion of 63/37 Brass in Nitric Acid Solution

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