<scp>l</scp>-Phenylalanine methyl ester hydrochloride as a green corrosion inhibitor for mild steel in hydrochloric acid solution and the effect of surfactant additive

Mobin, Mohammad; Zehra, Saman; Aslam, Ruby

doi:10.1039/c5ra24630j

Cited by 84 publications

(32 citation statements)

References 51 publications

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“…Generally, the value of DG 0 ads around À20 kJ mol À1 is consistent with the electrostatic interaction between the charged metal surface and the charged inhibitor molecules (physisorption), while a negative value of DG 0 ads less than À40 kJ mol À1 usually represents chemisorptions due to the coordinate interactions between lone pair electrons (or p-electrons) in the inhibitor molecule and the charged metal surface. 50 According to Table 4, the values of DG 0 ads for PD-1 and PD-2 are À33.64 and À34.47 kJ mol À1 , respectively. Therefore, the adsorption behaviors of PD-1 and PD-2 are mixed-type involving physisorption and chemisorption.…”

Section: Adsorption Isothermmentioning

confidence: 98%

“…Electrochemical measurements were carried out in a 0.5 M H 2 SO 4 solution without and with (5,10,20,50, 100 mg L À1 of PD-1 and PD-2, respectively) at 298 K using a CHI 660E electrochemical system (Shanghai Chenhua Instrument Co., Ltd). All measurements were carried out in a conventional threeelectrode cell assembly.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

“…Weight-loss tests were carried out in a 0.5 M H 2 SO 4 solution at 298 K in the absence and presence of various concentrations (5,10,20,50, 100 mg L À1 ) of PD-1 and PD-2. Prior to all tests, mild steel sheets of 5 Â 2.5 Â 0.2 cm were washed with water and acetone.…”

Section: Weight-loss Testmentioning

confidence: 99%

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Functional polyaspartic acid derivatives as eco-friendly corrosion inhibitors for mild steel in 0.5 M H₂SO₄solution

Chai

Shi

et al. 2018

RSC Adv.

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To improve the corrosion inhibition efficiency of eco-friendly polyaspartic acid (PASP) for mild steel in acidic solutions, PASP/N-(3-aminopropyl)imidazole (PD-1) and PASP/N-(3-aminopropyl)-imidazole-co-ndodecylamine (PD-2) were chemically synthesized by the facile ring-opening reaction of polysuccinimide. Inhibition efficiencies of PD-1 and PD-2 for mild steel in a 0.5 M H 2 SO 4 solution were investigated by electrochemical measurements (electrochemical impedance and polarization) and the weight loss method. In comparison with PASP, PD-1 and PD-2 show improved inhibition efficiencies due to the functional groups. In particular, PD-2 shows superior corrosion inhibition capacity, and the efficiency is up to 94% at a relatively low concentration of 100 mg L À1 at 298 K, as determined by potentiodynamic polarization measurements. Surface analysis of mild steel with PD-2 as an inhibitor clearly indicates that the inhibitor molecules adsorb on the steel surface and efficiently inhibit the corrosion of mild steel. The present work provides very meaningful results in designing and preparing new polymer inhibitors with high inhibition efficiency.

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Section: Adsorption Isothermmentioning

confidence: 98%

Section: Electrochemical Measurementsmentioning

confidence: 99%

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Functional polyaspartic acid derivatives as eco-friendly corrosion inhibitors for mild steel in 0.5 M H₂SO₄solution

Chai

Shi

et al. 2018

RSC Adv.

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“…The low-frequency impedance value increases up to two orders of magnitude compared to the solution without inhibitors, indicating the high inhibited effect of the inhibitors [32]. It is obviously that the frequency range with the maximum phase angle increases with the increasing concentration of inhibitors in the solution, demonstrating effective adsorption of inhibitor molecules on the copper surface [33]. Figure 5 gives two kinds of equivalent circuits.…”

Section: Potentiodynamic Polarization Curvesmentioning

confidence: 99%

Halogen-substituted pyrazolo-pyrimidine derivatives as corrosion inhibitors for copper in sulfuric acid solution

2018

Int. J. Corros. Scale Inhib.

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Sulfuric acid is widely used in several industrial fields, such as acid pickling, acid cleaning and acid descaling, which cause serious corrosion issues. Especially, copper being widely applied in industrial is vulnerable to be corroded by the acid. The usage of corrosion inhibitor is one of the most important techniques for controlling the corrosion. Several organic inhibitors containing hetero-atom, π-electrons and double bond have been applied for the corrosion inhibition of copper, which are found to exhibit high inhibiting properties by providing electrons to interact with metal surface. However, the use of several heterocyclic inhibitors has caused negative impact on the environment due to their toxicity and non-biodegradability. In this paper, pyrazolo-pyrimidine derivatives are found to attract great attention owing to their eco-friendly properties. Corrosion inhibited properties of three pyrazolo-pyrimidine derivatives namely 4-amino pyrazolo-pyrimidine (APP), 3-bromine 4-amino pyrazolo-pyrimidine (Br-APP) and 3-iodine 4-amino pyrazolo-pyrimidine (I-APP) on copper in 0.5 M H 2 SO 4 solution were studied using electrochemical method and surface analysis techniques. Corrosion of copper has been largely inhibited by the inhibitors and the inhibited efficiency increase with the augment of concentration. The adsorption isotherms were simulated to explore the adsorption mode of inhibitors. Furthermore, theoretical calculations were applied to research the mechanism of inhibitors on copper.

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“…The presence of zinc ion or the ester derivative of the amino acid increased the anticorrosion activity, in some cases synergically [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

N-Substituted unusual amino acids as corrosion inhibitors. Part IV: N-Acyl derivatives of unnatural amino acids with double bond

Telegdi

2016

Int. J. Corros. Scale Inhib.

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Corrosion inhibition efficiency of unusual phenyl alanine derivatives (substituted in the phenyl ring and double bond in the side chain) were investigated in neutral aqueous solution by weight loss test and by atomic force microscopy. The influence of the substituents in the phenyl ring as well as of the double bond was elucidated and explained. The effect of electrophilic or nucleophilic groups in the phenyl ring was demonstrated by efficacy and roughness parameters.Key words: phenylalanine derivatives, corrosion inhibitor, nucleophilic and electrophilic substituents in the phenyl ring, double bond.

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l-Phenylalanine methyl ester hydrochloride as a green corrosion inhibitor for mild steel in hydrochloric acid solution and the effect of surfactant additive

Abstract: Structure of l-phenylalanine methyl ester hydrochloride.

Cited by 84 publications

References 51 publications

Functional polyaspartic acid derivatives as eco-friendly corrosion inhibitors for mild steel in 0.5 M H₂SO₄solution

Functional polyaspartic acid derivatives as eco-friendly corrosion inhibitors for mild steel in 0.5 M H₂SO₄solution

Halogen-substituted pyrazolo-pyrimidine derivatives as corrosion inhibitors for copper in sulfuric acid solution

N-Substituted unusual amino acids as corrosion inhibitors. Part IV: N-Acyl derivatives of unnatural amino acids with double bond

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l-Phenylalanine methyl ester hydrochloride as a green corrosion inhibitor for mild steel in hydrochloric acid solution and the effect of surfactant additive

Abstract: Structure of l-phenylalanine methyl ester hydrochloride.

Cited by 84 publications

References 51 publications

Functional polyaspartic acid derivatives as eco-friendly corrosion inhibitors for mild steel in 0.5 M H2SO4solution

Functional polyaspartic acid derivatives as eco-friendly corrosion inhibitors for mild steel in 0.5 M H2SO4solution

Halogen-substituted pyrazolo-pyrimidine derivatives as corrosion inhibitors for copper in sulfuric acid solution

N-Substituted unusual amino acids as corrosion inhibitors. Part IV: N-Acyl derivatives of unnatural amino acids with double bond

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Functional polyaspartic acid derivatives as eco-friendly corrosion inhibitors for mild steel in 0.5 M H₂SO₄solution

Functional polyaspartic acid derivatives as eco-friendly corrosion inhibitors for mild steel in 0.5 M H₂SO₄solution