Journal of Chemistry

Review Article

Recent Natural Corrosion Inhibitors for Mild Steel: An Overview

Table 2

Plants extracts as corrosion inhibitors for mild steel.
Plant extractedMaterial solutionEffect of temperature on % inhibition efficiencyEffect of concentration on % inhibition efficiencyMethodsAdsorption isothermReference
MolassesHClDone at constant temperatureIncreasePotentiodynamic polarization, dynamic electrochemical impedance spectroscopy, and gasometry—[29]
Pterolobium hexapetalum and Celosia argenteaIndustrial waterDecreaseIncreaseWeight loss and electrochemical impedance spectroscopyLangmuir[25]
Pentaclethra macrophylla BenthamHClDecreaseIncreaseWeight loss and electrochemical impedance spectroscopyLangmuir and Temkin[30]
Phyllanthus fraternusH2SO4DecreaseIncreaseWeight loss, gasometric techniques, and electrochemical impedance spectroscopy—[31]
Antigonon leptopusH2SO4Increase then decreaseIncreaseWeight loss—[32]
Nypa fruticans WurmbH2SO4IncreaseIncreaseWeight loss—[33]
Aniba rosaeodoraHClDone at constant temperatureIncreasePotentiodynamic polarization and electrochemical impedance spectroscopyLangmuir[34]
Caesalpinia pulcherrimaH2SO4Increase then decreaseDecreaseWeight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy—[26]
Adenopus breviflorusHClDecreaseIncreaseWeight lossLangmuir[35]
Anacardium occidentaleH2SO4Done at constant temperatureIncreaseGravimetric analysisLangmuir[36]
Amaranthus cordatusH2SO4Done at constant temperatureIncreaseWeight loss—[37]
Rotula aquaticaH2SO4DecreaseIncreaseWeight loss, gasometric techniques, and electrochemical impedance spectroscopy—[38]
Polyalthia longifoliaH2SO4IncreaseIncreaseWeight lossLangmuir, Temkin, and Freundlich[27]
Coconut coirH2SO4DecreaseIncreaseWeight loss, gasometric techniques, electrochemical impedance spectroscopy, and potentiodynamic polarizationTemkin and Freundlich[39]
JuniperusH2SO4DecreaseIncreaseWeight loss, gasometric techniques, electrochemical impedance spectroscopy, and potentiodynamic polarizationTemkin[40]
Cucurbita maximaHClIncreaseIncreaseWeight lossLangmuir and Temkin[28]
Hyptis suaveolensH2SO4DecreaseIncreaseWeight loss, potentiodynamic polarization, and electrochemical impedance spectroscopyLangmuir[41]
Aloe barbadensisHNO3IncreaseIncreaseGravimetric analysis—[23]
C. PapayaHClDone at constant temperatureDecreaseWeight loss—[42] ⁢
Citrus aurantifoliaH2SO4DecreaseIncreaseWeight lossLangmuir and Freundlich[43]
Terminalia chebulaHClDone at constant temperatureIncreaseGravimetric analysis, potentiodynamic polarization, and electrochemical impedance spectroscopyLangmuir[44]
Hibiscus sabdariffaH2SO4 and HClDone at constant temperatureIncreaseWeight lossLangmuir[45]
Turmeric and ginger rhizomesHClNo trendIncreaseWeight loss and potentiodynamic polarizationLangmuir[46]
Watermelon rindH2SO4 and HClDone at constant temperatureIncreasepotentiodynamic polarization and electrochemical impedance spectroscopyTemkin[47]
Piper nigrumH2SO4DecreaseIncreaseWeight loss and gravimetric and thermometric analysis—[48]
African PerquetinaH2SO4DecreaseIncreaseWeight loss and gravimetric, gasometric, and thermometric analysisLangmuir[49]
Musa paradisiacaHClDone at constant temperatureIncreaseWeight loss, electrochemical impedance spectroscopy, and Tafel polarizationLangmuir[50]
Nicotiana tabacumH2SO4DecreaseIncreaseWeight lossLangmuir[51]
PectinHClIncreaseIncreaseWeight loss, potentiodynamic polarization, and electrochemical impedance spectroscopyLangmuir[3]
Hunteria umbellataH2SO4 and HClDecreaseIncreaseWeight lossLangmuir[2]
Vernonia amygdalinaH2SO4DecreaseIncreaseWeight loss, gasometry, and thermometric measurementsLangmuir[52]
NeemSalt waterDone at constant temperatureIncreaseWeight loss—[24]
African breadfruitH2SO4IncreaseIncreaseWeight lossFreundlich[53]
Ligularia fischeriHClDecreaseIncreaseWeight loss, potentiodynamic polarization, Tafel polarization, and electrochemical impedance spectroscopyLangmuir[54]
Phyllanthus amarusHClDecreaseIncreaseWeight loss, potentiodynamic polarization, and electrochemical impedance spectroscopyLangmuir[55]
Elaeis guineensisHClDecreaseIncreaseWeight loss, potentiodynamic polarization, and electrochemical impedance spectroscopyLangmuir[56]
Aloe veraHClDecreaseIncreaseWeight loss and electrochemical impedanceLangmuir[57]