Pullulan as a potent green inhibitor for corrosion mitigation of aluminum composite: Electrochemical and surface studies

Charitha, B P; Rao, Padmalatha

doi:10.1016/j.ijbiomac.2018.01.218

Cited by 42 publications

(6 citation statements)

References 59 publications

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“…Figure 3 shows the Nyquist plots obtained for the acid corrosion of Al-composite with various concentrations of the HCT at 303 K. Similar plots were recorded at 313 K and 323 K. The Nyquist plot of aluminium composite consisted of two loops: high frequency (HF) capacitive loop and intermediate frequency (IF) inductive loop. The shape of the plots obtained agreed well with others reported in the literature [30][31][32].…”

Section: Electrochemical Impedance Spectroscopy (Eis) Studysupporting

confidence: 90%

Hydrazinecarbothioamide Derivative as an Effective Inhibitor for Corrosion Control: Electrochemical, Surface and Theoretical Studies

et al. 2021

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Aluminium has played a significant role in the advancement of metal matrix composites (MMC) and has drawn the attention of researchers since Al composites find extensive application in aerospace, military and automobile industries. This paper describes the corrosion property of 6061 Al-15 vol%. SiC(p) composites in hydrochloric acid medium. This composite with high strength-to-weight ratio and other alluring properties undergoes corrosion in acid media and a study has been made in 0.5 M hydrochloric acid using (2Z)-2-(2-hydroxy-3methoxybenzylidene) hydrazinecarbothioamide (HCT) as an inhibitor. Results of the electrochemical studies and surface morphology are presented. With the increase in HCT concentration, inhibition efficiency increased. But efficiency decreased with an increase in temperature. The maximum efficiency was found to be 56.8% for the addition of 10 × 10–5 M HCT concentration at 303 K. The inhibitor was found to behave as a mixed inhibitor affecting both anodic metal dissolution reaction and cathodic hydrogen evolution to the same extent. The HCT molecules were found to physisorb over the Al-composite surface and adsorption followed Langmuir’s adsorption isotherm. Adsorption of HCT was confirmed by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Computational studies using density functional theory (DFT) supported experimental findings. Density functional theory calculations gave a clear insight into the mechanistic aspects of corrosion inhibition. Graphic Abstract

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Section: Electrochemical Impedance Spectroscopy (Eis) Studysupporting

confidence: 90%

Hydrazinecarbothioamide Derivative as an Effective Inhibitor for Corrosion Control: Electrochemical, Surface and Theoretical Studies

et al. 2021

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“…Studies were done using an electrochemical workstation (CH604 E Series, U.S. model) using a three-electrode Pyrex cell. Experimental procedures described in the literature were implemented for performing potentiodynamic polarization (PDP) and impedance spectroscopy (EIS) techniques [12]. The potentiodynamic polarization method was done immediately after electrochemical impedance readings without additional surface treatment.…”

Section: Electrochemical Studiesmentioning

confidence: 99%

“…1, a plateau was detected in the anodic Tafel curve in the potential range of − 0.7 to − 0.5 V. This accounts for the passivation occurring on the alloy surface. Hence, the only cathodic curve of Tafel plots was reasoned to take corrosion current density [12]. The addition of SEPT did not alter the cathodic slope.…”

Section: Potentiodynamic Polarization (Pdp) Studiesmentioning

confidence: 99%

The Use of Green Inhibitors in Evaluating the Safe Expiry Dates of Therapeutics

2021

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The present work was done with dual intentions. The primary aim was to attenuate the acid corrosion of 6061 aluminum alloy by green approach. While doing so, an attempt was made to use the expiry date pharmaceutical product Streptomycin (SEPT) injection. This unique method could provide the best possible pathway for the utility of otherwise useless, non-eco-friendly expiry date drugs. Corrosion inhibition studies were performed using electrochemical techniques. Experimental settings were augmented to attain the highest possible efficacy of SEPT by changing its concentration and temperature. Experimental values were close-fitted into proper adsorption isotherm. Surface morphology studies like SEM and AFM were performed to confirm the adsorption of inhibitor. Streptomycin emerged as an exceptionally good inhibitor with an efficacy of 77% for the addition of just 1 ppm of the inhibitor at 303 K. Outcome of the work provided a unique pathway for utility expiry date drug, thereby minimizing the environmental pollution.

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“…As a part of our research work on the studies of corrosion behavior and corrosion inhibition of nonferrous materials [22][23][24][25][26][27] under static and dynamic conditions [28], we report herein an up-to-date review on corrosion inhibition strategy for zinc under various corrosive mediums.…”

Section: Introductionmentioning

confidence: 99%

An Up-to-Date Review on Industrially Significant Inhibitors for Corrosion Control of Zinc

Pais

Rao

2021

J Bio Tribo Corros

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Zinc, an important nonferrous metal, is the fourth most used metal in the world. It has innumerable uses in industrial as well as in other segments. The primary utility of zinc is in galvanization and as an anode in the battery. Steel coated with zinc, which is known as galvanized steel, is widely used in industries. Even though zinc protects many metals from undergoing corrosion, by itself, it undergoes corrosion in several acidic, alkaline, and neutral environments. The corrosion behavior of zinc is significant in all industries where it is utilized either directly or indirectly in the form of a sacrificial coating. In-depth analysis of the reported literature indicated that corrosion attenuation of zinc in acidic and alkaline medium was studied by many researchers, and various classes of inhibitors were tried under varying experimental conditions. Most inhibitors can be amalgamated as excellent inhibitors with an inhibition efficiency of 80–90%. Even though this is a subject of intense research, systematic documentation on the same is not available in the literature. This review consolidates research work on corrosion and inhibition studies of zinc and galvanized steel over a period of three decades.

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Pullulan as a potent green inhibitor for corrosion mitigation of aluminum composite: Electrochemical and surface studies

Cited by 42 publications

References 59 publications

Hydrazinecarbothioamide Derivative as an Effective Inhibitor for Corrosion Control: Electrochemical, Surface and Theoretical Studies

Hydrazinecarbothioamide Derivative as an Effective Inhibitor for Corrosion Control: Electrochemical, Surface and Theoretical Studies

The Use of Green Inhibitors in Evaluating the Safe Expiry Dates of Therapeutics

An Up-to-Date Review on Industrially Significant Inhibitors for Corrosion Control of Zinc

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