Current Status, Opportunities and Challenges of Green Corrosion Inhibitors
Subhajit Kundu, Mahuya Das, Debarati Mitra
The term ‘Corrosion’ is associated with the deterioration of materials. To get rid of this problem corrosion inhibitors are commonly used. Though many conventional corrosion inhibitors can efficiently reduce corrosion, their disposal often adversely affects the environment. However, there are many natural products that have the potential of reducing corrosion and they are referred to as green corrosion inhibitors. They are much safer to use and most importantly cost-effective. This chapter deals with the current development of the use of green corrosion inhibitors, their opportunities and challenges.
Corrosion, Inhibition, Natural Products, Environment Friendly
Published online 6/5/2021, 29 pages
Citation: Subhajit Kundu, Mahuya Das, Debarati Mitra, Current Status, Opportunities and Challenges of Green Corrosion Inhibitors, Materials Research Foundations, Vol. 107, pp 1-29, 2021
Part of the book on Sustainable Corrosion Inhibitors
 V.S. Sastri, Green Corrosion Inhibitor: Theory and Practice, A John Wiley & Sons Inc. Publication, 2011, pp.1. https://doi.org/10.1002/9781118015438
 Terminology Relating to Corrosion and Corrosion Testing, American Society for Testing and Materials Designation G 15-99b (Revised), 2000, 03.02.
 U.R. Evans, Metallic Corrosion and Protection, Edward Arnold, London, 1937
 C. Wagner, W. Traud, Uber die Deutung von Korrosionsvorg¨angendurch ¨Uberlagerung von elektrochemischenTeilvorgangen und uber die Potentialbildung an Mischelektroden. Z. Elektrochem., 44 (1938) 391-402.
 D.M. Brasher, A.D. Mercer, Comparative study of factors influencing the action of corrosion inhibitors for mild steel in neutral solution: I. sodium benzoate, Br. Corros. J. 3(3) (1968) 120-129. https://doi.org/10.1179/000705968798326271
 A.K. Dunlop, R.L. Howard, P.J. Raifsnider, Mater. Prot. 8 (1969) 27.
 E. Ivanov, Y.I. Kuznetsov, Zasch. Met. 24 (1988) 36.
 P. Hersch, J.B. Hare, A. Robertson, An experimental survey of rust preventives in water I. Methods of testing, J. Appl. Chem. 11 (1961) 246-250. https://doi.org/10.1002/jctb.5010110704
 M.G. Fontana, R.W. Staehle, Advance Corrosion Science Technology, first volume, Plenum Press, New York, London, 1970. https://doi.org/10.1007/978-1-4615-8252-6
 R. Char, T.L., D.K. Padma, Corrosion inhibitors for industry: Review of literature of inhibitors minimizing corrosion in different environment from 1965-1968, Trans. Inst. Chem. Eng. 47 (1969) 177-182.
 R. Walker, The use of benzotriazole as a inhibitor for copper, Anti-Corros. Meth. Mater. 17(9) (1970) 9-15. https://doi.org/10.1108/eb006791
 V.S. Sastri, Green Corrosion Inhibitor: Theory and Practice, A John Wiley & Sons Inc., Publication, 2011, pp. 258. https://doi.org/10.1002/9781118015438
 C. Xu, W. Gao, Pilling-Bedworth ratio for oxidation of alloys. Mater. Res. Innov. 4 (2000) 231-235. https://doi.org/10.1007/s100190050008
 R.E. Bedworth, N.B. Pilling, The oxidation of metals at high temperatures. J. Inst. Metals. 29 (1923) 529-582.
 Omnia S. Shehata, Lobna A. Korshed, Adel Attia, Green Corrosion Inhibitors, Past, Present, and Future, Chapter 6, IntechOpen, 2017. https://doi.org/10.5772/intechopen.72753
 K.M. Emran, S.M. Ali, H.A. Al Lehaibi, Green methods for corrosion control, Chapter 3, in: M. Aliofkhazraei (Ed.), Corrosion Inhibitors, Principles and Recent Applications, IntechOpen, 2017. https://doi.org/10.5772/intechopen.72762
 S.K. Sharma (Ed.), Green Corrosion Chemistry and Engineering, Wiley-VCH Verlag & Co. KGaA, 2012.
 I.H. Farooqi, M.A. Quraishi, Proceedings of the GLOCORR’2002, International Congress on Emerging Corrosion Control Strategies for the new Millennium, NCCI & CECRI, New Delhi, February 2002.
 V.S. Agarwaala, A new approach in corrosion inhibition, Proceedings of International Congress on Metallic Corrosion, Toronto, 1 (1984) 80.
 R.M. Saleh, A.A. Ismail, A.H. El Hosary, Corrosion inhibition by naturally occurring substances: The effect of aqueous extracts of some leaves and fruit peels on the corrosion of steel, Al, Zn and Cu in acids, Br. Corros. J. 17 (1982) 131-135. https://doi.org/10.1179/000705982798274345
 M. Abdel-Gaber, B.A. Abd-El-Nabey, I.M. Sidahmed, A.M. El-Zayaday, M. Saa dawy, Inhibitive action of some plant extracts on the corrosion of steel in acidic media, Corros. Sci. 48 (2006) 2765-2779. https://doi.org/10.1016/j.corsci.2005.09.017
 A. El-Hosary, R.M. Saleh, A.M. Sharns El Din, Corrosion inhibition by naturally occurringsubstances – I. The effect of Hibiscus subdariffa (karkade) extract on the dissolutionof Al and Zn, Corros. Sci. 12(1972) 897-904. https://doi.org/10.1016/S0010-938X(72)80098-2
 R. Ananda, L. Sathiyanathan, S. Maruthamuthu, M. Selvanayagam, S. Mohanan, N. Palaniswamy, Corrosion inhibition of mild steel by ethanolic extracts of Ricinus communis leaves, Indian J. Chem. Technol. 12 (2005) 356-360.
 M. Kliskic, J. Radosevic, S. Gudic, V. Katalinic, Aqueous extract of Rosmarinus officinalis L. as inhibitor of Al-Mg alloy corrosion in chloride solution, J. Appl. Electrochem. 30 (2000) 823-830. https://doi.org/10.1023/A:1004041530105
 B. Muller, Corrosion inhibition of aluminium and zinc pigments by saccharides, Corros. Sci. 44 (2002) 1583-1591. https://doi.org/10.1016/S0010-938X(01)00170-6
 F. Zucchi, I. Omar, Plant extracts as corrosion inhibitors of mild steel in HCl solutions, Surf. Tech. 24 (1985) 391-399. https://doi.org/10.1016/0376-4583(85)90057-3
 A. Minhaj, P.A. Saini, M.A. Quarishi, I.H. Farooqi, A study of natural compounds as corrosion inhibitors for industrial cooling systems, Corros. Prev. Control. 46 (1999) 32-38.
 A.Y. El-Etre, Natural honey as corrosion inhibitor for metals and alloys of copper in neutral aqueous solution, Corros. Sci. 40 (1998) 1845-1850. https://doi.org/10.1016/S0010-938X(98)00082-1
 M.J. Sanghvi, S.K. Shukla, A.N. Misra, M.R. Mehta, 5th National Congress on Corrosion Control, New Delhi, 1995, pp. 46.
 E. Oguzie, Inhibition of acid corrosion of mild steel by Telfaria occidentalis, Pigm. Resin Technol. 34 (2005) 321-326. https://doi.org/10.1108/03699420510630336
 L.R. Chauhan, G. Gunasekaran, Corrosion inhibition of mild steel by plant extract in dilute HCl medium, Corros. Sci. 49 (2007) 1143-1161. https://doi.org/10.1016/j.corsci.2006.08.012
 Y. Li, P. Zhao, Q. Liang, B. Hou, Berberine as a natural source inhibitor for mild steel in 1M H2SO4. Appl. Surf. Sci., 252 (5) (2005) 1245-1253. https://doi.org/10.1016/j.apsusc.2005.02.094
 G. Tammann, The chemical and galvanic properties of alloy states and their atomic configurations, Z. Anorg. Chem. 107 (1919) 155-156.
 C. Okafor, M.E. Ikpi, I.E. Uwah, E.E. Ebenso, U.J. Ekpe, S.A. Umoren, Inhibitory action of Phyllanthusamarus extracts on the corrosion of mild steel in acidic media, Corros. Sci. 50 (2008) 2310-2317. https://doi.org/10.1016/j.corsci.2008.05.009
 N. Eddy, Inhibitive and adsorption properties of ethanol extract of Colocasia esculenta leaves for the corrosion of mild steel in H2SO4, Int. J. Phys. Sci. 4 (2009) 165-171. https://doi.org/10.1108/03699421011085849
 S. Cheng, S. Chen, T. Liu, X. Chang, Y. Yin, Carboxymethyl chitosan as an eco- friendly inhibitor for mild steel in 1M HCl, Mater. Lett. 61 (2007) 3276-3280. https://doi.org/10.1016/j.matlet.2006.11.102
 O. Ime, O.E. Nelson., An interesting and efficient green corrosion inhibitor for Aluminium from extracts of Chlomolaena odorata L. in acidic solution. J. Appl. Electrochem. 40 (2010) 1977-1984 https://doi.org/10.1007/s10800-010-0175-x
 P.D. Rani, S. Selvaraj, Inhibitive and adsorption properties of punica granatum extract on brass in acid media, J. Phytology 2 (2010) 58-64.
 E. Khamis, N. Alandis, Herbs as new type of green inhibitors for acidic corrosion of steel. Material Wissenschaft und Werkstofftechnik. 33(2002) 550-554. https://doi.org/10.1002/1521-4052(200209)33:9<550::AID-MAWE550>3.0.CO;2-G
 M. Kundu, S.K. Prasad, K. Virendra, A review article on green inhibitors of reinforcement concrete corrosion. Int. J. Emerg. Res. Mangt. Technol. 5 (2016) 42-46.
 S.A. Asipita, M. Ismail, M.Z.A. Majid, C.S. Abdullah, J. Mirza, Green Bambusa arundinacea leaves extract as a sustainable corrosion inhibitor in steel reinforced concrete. J. Cleaner Prod. 67 (2014) 139-146. https://doi.org/10.1016/j.jclepro.2013.12.033
 D.G. Eyu, H. Esah, C. Chukwuekezie, J. Idris, I. Mohammad, Effect of green inhibitor on the corrosion behavior of reinforced carbon steel in concrete. ARON J. Eng. Appl. Sci. 8 (2013) 326-332.
 A.S. Fouda, A.H. Badr, Aqueous extract of propolis as corrosion inhibitor for carbon steel in aqueous solutions, Afr. J. Pure Appl. Chem. 7 (2013) 50-359. https://doi.org/10.5897/AJPAC2013.0524
 M.M. Fares, A.K. Maayta, M.M. Al-Qudah, Pectin as promising green corrosion inhibitor of aluminum in hydrochloric acid solution, Corros. Sci. 60 (2012) 112-117. https://doi.org/10.1016/j.corsci.2012.04.002
 N. Saidi, H. Elmsellem, M. Ramdani, A. Chetouani, K. Azzaoui, F. Yous, A. Aouniti, B. Hammouti, Using pectin extract as eco-friendly inhibitor for steel corrosion in 1 M HCl media, Der. Pharma. Chem. 7 (2015) 87-94.
 A.K. Larios-Galvez, J. Porcayo-Calderon, V.M. Salinas-Bravo, J.G. Chacon-Nava, J.G. Gonzalez-Rodriguez, L. Martinez-Gomez, Use of Salvia hispanica as an eco-friendly corrosion inhibitor for bronze in acid rain, Anti-Corros. Methods Mater. 64 (2017) 654-663. https://doi.org/10.1108/ACMM-02-2017-1760
 A. Ostovari, S.M. Hoseinieh, M. Peikari, S.R. Shadizadeh, S.J. Hashemi, Corrosion inhibition of mild steel in 1 MHCl solution by henna extract: A comparative study of the inhibition by henna and its constituents (Lawsone, Gallic acid, α-d-Glucose and Tannic acid), Corros. Sci. 51 (2009) 1935-1949. https://doi.org/10.1016/j.corsci.2009.05.024
 D. Amar, S. Lahcene, D. Djamila, O. Meriem, N. Abdelkader, R. Salah-edin, Alkaloids Extract from Peganumharmala Plant as Corrosion Inhibitor of 6063 Aluminium Alloy in 1 M Hydrochloric Acid Medium, J. Chem. Pharm. Res. 9 (2017) 311-318.
 H. Gerengi, H.I. Sahin, Schinopsis lorentzii extract as a green corrosion inhibitor for low carbon steel in 1 M HCl solution, Ind. Eng. Chem. Res. 51 (2012) 780-787. https://doi.org/10.1021/ie201776q
 M. Faustin, A. Maciuk,P. Salvin, C. Roos, M. Lebrini,Corrosion inhibition of C38 steel by alkaloids extract of Geissospermumlaeve in 1M hydrochloric acid: Electrochemical and phytochemical studies, Corros. Sci. 92 (2015) 287-300. https://doi.org/10.1016/j.corsci.2014.12.005
 R. Fdil, M. Tourabi, S. Derhali, A. Mouzdahir, K. Sraidi, C. Jama, A. Zarrouk, F. Bentiss, Evaluation of alkaloids extract of Retamamonosperma (L.) Boiss. stems as a green corrosion inhibitor for carbon steel in pickling acidic medium by means of gravimetric, AC impedance and surface studies, J. Mater. Environ. Sci. 9 (2018) 358-369. https://doi.org/10.26872/jmes.2018.9.1.39
 P.B. Raja, A.K. Qureshi, A.A. Rahim, H. Osman, K. Awang, Neolamarckiacadamba alkaloids as eco-friendly corrosion inhibitors for mild steel in 1 M HCl media, Corros. Sci. 69 (2013) 292-301. https://doi.org/10.1016/j.corsci.2012.11.042
 A. Y. El-Etre, Inhibition of acid corrosion of carbon steel using aqueous extract of olive leaves, J. Colloid Interface Sci. 314 (2007) 578-583. https://doi.org/10.1016/j.jcis.2007.05.077
 N.A. Odewunmi, S.A. Umoren, Z.M. Gasem, Watermelon waste products as green corrosion inhibitors for mild steel in HCl solution, J. Environ. Chem. Eng. 3(2015) 286-296. https://doi.org/10.1016/j.jece.2014.10.014
 A.N. Grassino, J. Halambek, S. Djakovi’c, S. Rimac Brnci’c, M. Dent, Z. Grabari’c, Utilization of tomato peel waste from canning factory as a potential source for pectin production and application as tin corrosion inhibitor, Food Hydrocoll. 52 (2016) 265-274. https://doi.org/10.1016/j.foodhyd.2015.06.020
 A. Bouyanzer, B. Hammouti, L. Majidi, Pennyroyal oil from Menthapulegium as corrosion inhibitor for steel in M HCl, Materials Letters. 60(2006)2840-2843 https://doi.org/10.1016/j.matlet.2006.01.103
 K. Boumhara H. Harhar, M. Tabyaoui A. Bellaouchou A. Guenbour A. Zarrouk, Corrosion inhibition of mild steel in 0.5 m H2SO4 solution by artemisia herba-alba Oil, J. bio- tribo-corros. 8 (2019) Article 5. https://doi.org/10.1007/s40735-018-0202-8
 Narayanasamy, Poongothai, P. Rajendran, M. Natesan, N. Palaniswamy, Wood bark oils as vapour phase corrosion inhibitors for metals in NaCl and SO2 environments. Ind. J. Chem. Technol. 12 (2005) 641-647.
 M.E.I-Sayed, O.Y. Mansour, I.Z. Selim, M.M. Ibrahim, Identification and utilization of banana plant juice and its liquor as anti-corrosive mate-rials, J. Sci. Ind. Res. 60 (2001) 738-747.
 A.K. Satapathy, G. Gunasekaran, S.C. Sahoo, K. Amit, P.V. Rodrigues, Corrosion inhibition by Justiciagendarussa plant extract in hydrochloric acid solution, Corros. Sci. 51 (2009) 2848-2856. https://doi.org/10.1016/j.corsci.2009.08.016
 F.S.de Souza, A. Spinelli, Caffeic acid as a green corrosion inhibitor in mild steel, Corros. Sci. 51 (2009) 642-649. https://doi.org/10.1016/j.corsci.2008.12.013
 J.C. Rocha, J.A. Cunha, P. Gomes, E.D. ‘Elia, Corrosion inhibition of carbon steel in hydrochloric acid solution by fruit peel aqueous extract, Corros. Sci. 52 (2010) 2341-2348 https://doi.org/10.1016/j.corsci.2010.03.033
 F.A. Ayeni, V.S. Aigbodion, S.A. Yaro, Non-toxic plant extract as corrosion inhibitor for chill cast Al-Zn-Mg alloy in caustic soda solution, EurAsia Chemico-Technol. J. 9 (2007) 91-96.
 P.C. Okafor, M.E. Ikpi, I.E. Uwah, E.E. Ebenso, U.J. Ekpe, S.A. Umoren, Inhibitory action of Phyllanthusamarus extracts on the corrosion of mild steel in acidic media, Corros. Sci. 50 (2008) 2310-2317. https://doi.org/10.1016/j.corsci.2008.05.009
 M.A. Quraishi, A. Singh, V.K. Singh, D.K. Yadav, A.K. Singh, Green approach to corrosion inhibition of mild steel in hydrochloric acid and sulphuric acid solutions by the extract of Murrayakoenigii leaves, Mater. Chem. Phys. 122 (2010) 114-122. https://doi.org/10.1016/j.matchemphys.2010.02.066
 E. Khamis, N. Alandis, Herbs as new type of green inhibitors for acidic corrosion of steel, Materialwissenschaftund Werkstoffiechnik. 33 (2002) 550-554 https://doi.org/10.1002/1521-4052(200209)33:9<550::AID-MAWE550>3.0.CO;2-G
 A.M. Al-Turkustani, S.T. Arab, L.S.S. Al-Qarni, MedicagoSative plant as safe inhibitor on the corrosion of steel in 2.0 M H2SO4 solution, J. Saudi Chem. Soc. 15(1) (2011) 73-82. https://doi.org/10.1016/j.jscs.2010.10.008
 E.A. Noor, Potential of aqueous extract of Hibiscus sabdariffa leaves for inhibiting the corrosion of aluminum in alkaline solutions, J. Appl. Electrochem. 39 (2009) 1465-1475. https://doi.org/10.1007/s10800-009-9826-1
 M. Dakmouche, S. Ladjel, N. Gherraf, M. Saidi, M. Hadjaj, M.R. Ouahrani, Inhibition effect of some plant extracts on the corrosion of mild steel in H2SO4 medium, Asian J. Chem. 21 (2009) 6176-6180.
 S. Rajenderan, J. Jeyasundari, P. Usha, J.A. Selvi, B. Narayanasamy, A.P.P. Regis, P. Renga, Corrosion behavior of aluminium in the presence of an aqueous extract of hibiscus rosasinensis, Port. Electrochim. Acta. 27 (2009) 153-164. https://doi.org/10.4152/pea.200902153
 A.Y. El-Etre, M. Abdallah, Z.E. El-Tantawy, Corrosion inhibition of some metals using lawsonia extract, Corros. Sci. 47 (2005) 385-395. https://doi.org/10.1016/j.corsci.2004.06.006
 T.K. Soror, New naturally occurring product extract as corrosion inhibitor for 316 stainless steel in 5% HCl, J. Mater. Sci. Technol. 20 (2004) 463-466.
 H.H. Rehan, Corrosion control by water-soluble extracts from leaves of economic plants, Material wissenschaft und Werkstofftechnik. 34 (2003) 232-237. https://doi.org/10.1002/mawe.200390034
 T. Emranuzzaman, S. Kumar, G. Vishwanatham, Udayabhanu, Synergistic effects of formaldehyde and alcoholic extract of plant leaves for protection of N80 steel in 15% HCl, Corros. Eng. Sci. Technol. 39 (2004) 327-332. https://doi.org/10.1179/174327804X13181
 J. Radosevic, M. Kliskic, A. Visekruna, Inhibition of corrosion of the Al-2.5Mg Alloy by means of the third acidic phenolic subfraction of aqueous extract of Rosemary, J. Chem. Chem. Eng. 50 (2001) 537-541.
 A.Y. El-Etre, Inhibition of aluminum corrosion using Opuntia extract, Corros. Sci. 45 (2003) 2485-2495. https://doi.org/10.1016/S0010-938X(03)00066-0
 I.B. Obot, N.O. Obi-Egbedi, Ginseng, a new efficient and effective eco-friendly corrosion inhibitor for aluminium alloy of type AA 1060 in hydrochloric acid solution, Int. J. Electrochem. Sci. 4 (2009) 1277-1288.
 Y.F. Barakat, A.M. Hassan, A.M Baraka, Corrosion inhibition of mild steel in aqueous solution containing H2S by some naturally occurring substances, Materialwissenchaft und Werkstofftechnik. 29 (1998) 365-370. https://doi.org/10.1002/mawe.19980290709
 C.A. Loto, The effect of mango bark and leaf extract solution additives on the corrosion inhibition of mild steel in dilute sulphuric acid-part I, Corros. Prev. Control. 48 (2001) 38-41.
 G.H. Awad, Effect of some plant extracts on the corrosion of mild steel in 0.1N Hydrochloric acid solutions., 1985.
 G. Gunasekaran, L.R. Chauhan, Eco-friendly inhibitor for corrosion inhibition of mild steel in phosphoric acid medium, Electrochim. Acta. 49(25) (2004) 4387-4395. https://doi.org/10.1016/j.electacta.2004.04.030
 M.E. Ibrahim, A.M. El-Khrisy, E.M.M. Al-Abdallah, A.Baraka, evaluation of the inhibitor action of certain natural substances used as corrosion inhibitors-1 in the dissolution of tin in nitric acid, Mo MetalloberflancheBeschichten won Metall und Kunstsoff, (1981) 134-136.
 A. Olusegun, K. and James, A.O. (2010) Corros. Sci., 52 (2), 661-664 https://doi.org/10.1016/j.corsci.2009.10.026
 Z. Fabrizio, O.I. Hashi, Plant extracts as corrosion inhibitors of mild steel in HCl solutions, Surf. Technol. 24(4) (1985) 391-399. https://doi.org/10.1016/0376-4583(85)90057-3
 X.-H. Li, S.-D. Deng, H. Fu, Inhibition by Jasminum nudiflorum Lindl. leaves extract of the corrosion of cold rolled steel in hydrochloric acid solution, J. Appl. Electrochem., 40(9) (2010) 1641-1649. https://doi.org/10.1007/s10800-010-0151-5
 P.D. Rani, S. Selvaraj, Inhibitive action of vitis vinifera (grape) on copper and brass in natural sea water environment, Rasayan J. Chem., 3(3) (2010) 473-482.
 G.D. Davis, J.A. von Fraunhofer, L.A. Krebs, C.M. Dacres, Corros. 2001, Paper 1558.
 A.A. Torres-Acosta, Opuntia-Ficus-Indica (Nopal) mucilage as a steel corrosion inhibitor in alkaline media, J. Appl. Electrochem. 37(7) (2007) 835-841. https://doi.org/10.1007/s10800-007-9319-z
 N. Gherraf, T.Y. Namoussa, S. Ladjel, M.R. Ouahrani, R. Salhi, A. Belmnine S. Hameurlain, B. Labed, Am.-EurAsian J. Sustain. Agric., 3 (4) (2008) 781-783.
 H.M. Hazwan, K.M. Jain, Electrochemical studies of mild steel corrosion inhibition in aqueous solution by uncaria gambir extract, J. Phys. Sci. 21 (1) (2010) 1-13.
 E.E. Ouariachi, J. Paolini, M. Bouklah, A. Elidrissi, A. Bouyanzer, B. Hammouti, J.-M. Desjobert, J. Costa, Acta Metall. Sin. (Engl. Lett.) 23 (1) (2010) 13-20.
 A. Ostovari, S.M. Hoseinieh, M. Peikari, S.R. Shadizadeh, S.J. Hashemi, Corrosion inhibition of mild steel in 1 M HCl solution by henna extract: A comparative study of the inhibition by henna and its constituents (Lawsone, Gallic acid, α-D-Glucose and Tannic acid), Corros. Sci. 51 (9) (2009) 1935-1949 https://doi.org/10.1016/j.corsci.2009.05.024
 M. Lebrini, F. Robert, C. Roos, Inhibition effect of alkaloids extract from annona squamosa plant on the corrosion of c38 steel in normal hydrochloric acid medium, Int. J. Electrochem. Sci. 5 (2010) 1698-1712.
 G. Bianchi, F. Mazza, Corrosione e ProtezionedeiMetalli; AssociazioneItaliana di Metallurgia: Milano, Italy, 2000.
 G. Koch, J. Varney, N. Thompson, O. Moghissi, M. Gould, J. Payer, International Measures of Prevention, Application, and Economics of Corrosion Technologies Study; NACE Internationa: Houston, TX, USA, 2016.
 G.R. Thusnavis, K.P.V. Kumar, Green corrosion inhibitor for steel in acid medium, Application No. 6278/CHE/2014 A, 12 December 2014.
 J.B. Zhang, F. Zhenquan, Y. Yaorong, Z. Chengxian, L. Xuehui, C.R. Fagen, Extract Corrosion Inhibitor of Sweet Potato Stems and Lettuce Flower Stalks and Preparation Method Thereof. Patent No. CN102492948B, 31 July 2013.
 J.A. Ponciano Gomes, J.R. Cardoso, E. D’Elia, Use of Fruit Skin Extracts as Corrosion Inhibitors and Process for Producing Same. U.S. Patent US8926867B2, 6 January 2015.
 P.J. Kinlen, L.P.S. Pinheiro, Methods and apparatuses for selecting natural product corrosion inhibitors for application to substrates. U.S. Patent Application No. US 2018/0202051 Al, 19 July 2018.
 R. Lima, A. Casalini, A. Palumbo, G. Rivici, Corrosion inhibitor comprising complex oligomeric structures derived from vegetable oils. Patent Application No. WO 2017/140836 Al, 24 August 2017.
 E.I. Ating, S.A. Umoren, I.I. Udousoro, E.E. Ebenso, A.P. Udoh, Leaves extract of Ananassativum as green corrosion inhibitor for aluminum in hydrochloric acid solution. Green Chem. Lett. Rev. 3 (2010) 61-68. https://doi.org/10.1080/17518250903505253
 E. Honarmand, H. Mostaanzadeh, M.H. Motaghedifard, M. Hadia, M. Khayadkashanic, Inhibition effect of opuntia stem extract on corrosion of mild steel: a quantum computational assisted electrochemical study to determine the most effective components in inhibition. Protect Met. Phys. Chem. Surface, 53 (2017) 560-572. https://doi.org/10.1134/S207020511703008X
 M. Abdallah, Guar gum as corrosion inhibitor for carbon steel in sulfuric acid solutions. Port. Electrochim. Acta. 22 (2004) 161-175. https://doi.org/10.4152/pea.200402161
 Baldwin J. British Patent. 1895: 2327.
 A. Espinoza-Vázquez, F.J. Rodríguez-Gómez, Caffeine and nicotine in 3% NaCl solution with CO2 as corrosion inhibitors for low carbon, RSC Adv. 74 (2016) 70226-70236. https://doi.org/10.1039/C6RA07673D
 C.A. Loto, A.P.I. Popoola, Effect of tobacco and kola tree extracts on the corrosion inhibition of mild steel in acid chloride. Int. J. Electrochem. Sci. 6 (2011) 3264-3276.
 H. Kumar, V. Saini, V. Yadav, Study of vapour phase corrosion inhibitors for mild steel under different atmospheric conditions. Int. J. Eng. Innov. Technol. 3 (2013) 206-211.
 S.K. Shetty, A.N. Shetty, Ionic liquid as an effective corrosion inhibitor on 6061 Al-15 Vol. Pct. SiC (p) composite in 0.1 M H2SO4 medium-an ecofriendly approach. Can. Chem. Trans. 3 (2015) 41-64. https://doi.org/10.13179/canchemtrans.2015.03.01.0160
 R. Oukhrib, B. El Ibrahim, H. Bourzi, K. El Mouaden, A. Jmiai, S. El Issami, L. Bammou, L. Bazzi, Quantum chemical calculations and corrosion inhibition efficiency of biopolymer “chitosan” on copper surface in 3% NaCl. J. Mater. Environ. Sci. 8 (2017) 195-208.
 Subhashini S. Corrosion inhibition study of mild steel in acid media by extract of some leguminous seeds as eco-friendly inhibitors. J. Camel Pract. Res. 11 (2004) 27-34.
 C. Verma, D.S. Chauhan, M.A. Quraishi, Drugs as environmentally benign corrosion inhibitors for ferrous and nonferrous materials in acid environment: an overview. J. Mater. Environ. Sci. 8 (2017) 4040-4051
 R.M. Palou, O. Olivares-Xomelt, N.V. Likhanova, Environmentally friendly corrosion inhibitors, in: Developments in Corrosion Protection, M. Aliofkhazraei (Ed.), InTech, 2014, pp. 431-465.