The objective of this study was to evaluate the use of rhamnolipids (RLs) extracted from Pseudomonas aeruginosa as a possible eco-friendly inhibitor for the corrosion protection of rebars in concrete. Two application methods were tested: application of RLs as a coating on the steel (conditioning method) and addition of the RLs directly to the aggressive environment (addition method). Both methods were evaluated for their ability to protect steel in simulated concrete pore solution containing 0.5 M NaCl. The results highlight a delay in the initiation of local corrosion followed by a rapid propagation rate of corrosion for conditioning method. This evolution is in relation with the heterogeneity of the formed RLs layers. The addition method provides a different film formation and better protection against corrosion. Using a 1 g·L concentration, the inhibition effect was observed at least for 24 h of immersion.
GoniSAndradeC.Synthetic concrete pore solution chemistry and rebar corrosion rate in the presence of chlorides. Cem Concr Res. 1990; 20: 525–539. doi: 10.1016/0008-8846(90)90097-H
2.
AlonsoCAndradeCCastelloM. Chloride threshold values to depassivate reinforcing bars embedded in a standardized opc mortar. Cem Concr Res. 2000; 30: 1047–1055. doi: 10.1016/S0008-8846(00)00265-9
3.
MontemorMFSimõesAMPFerreiraMGS.Chloride-induced corrosion on reinforcing steel: from the fundamentals to the monitoring techniques. Cem Concr Compos. 2003; 25: 491–502. doi: 10.1016/S0958-9465(02)00089-6
4.
CignaRAndradeCNürnbergerU. COST 521 – corrosion of steel in reinforced concrete structures – final report. Luxembourg: Office for Official Publications of the European Communities; 2003.
5.
BautistaAAlvarezSMParedesEC. Corrugated stainless steels embedded in carbonated mortars with and without chlorides: 9-year corrosion results. Constr Build Mater. 2015; 95: 186–196. doi: 10.1016/j.conbuildmat.2015.07.099
6.
FreireLCarmezimMJFerreiraMGS. The electrochemical behaviour of stainless steel AISI 304 in alkaline solutions with different pH in the presence of chlorides. Electrochim Acta. 2011; 56: 5280–5289. doi: 10.1016/j.electacta.2011.02.094
7.
YeomansSR.Galvanized steel reinforcement. In: PoursaeeAmir, editor. Corrosion of steel in concrete structures. Chap. 6, 111-129. Oxford: Woodhead Publishing; 2016.
8.
BertoliniLBolzoniFCigadaA. Cathodic protection of new and old reinforced concrete structures. Corros Sci. 1993; 35: 1633–1639. doi: 10.1016/0010-938X(93)90393-U
9.
KobayashiKTakewakaK.Experimental studies on epoxy coated reinforcing steel for corrosion protection. Int J Cem Compos Light Concr. 1984; 6: 99–116. doi: 10.1016/0262-5075(84)90039-3
10.
SoylevTARichardsonMG.Corrosion inhibitors for steel in concrete: state-of-the-art report. Constr Build Mater. 2008; 22: 609–622. doi: 10.1016/j.conbuildmat.2006.10.013
11.
ManningDG.Corrosion performance of epoxy-coated reinforcing steel: North American experience. Constr Build Mater. 1996; 10: 349–365. doi: 10.1016/0950-0618(95)00028-3
12.
HarttWHPowersRGLysogorskiDK. 2007. Corrosion resistant alloys for reinforced concrete (Report No. FHWA-HRT-07-039). McLean, VA: Federal Highway Administration.
13.
MaciasAAndradeC.Stability of the calcium hydroxyzincate protective layer developed on galvanized reinforcements after a further increase of the pH value. Br Corros J. 1986; 36: 19–28.
14.
RecioFJAlonsoMCGailletL. Hydrogen embrittlement risk of high strength galvanized steel in contact with alkaline media. Corros Sci. 2011; 53: 2853–2860. doi: 10.1016/j.corsci.2011.05.023
15.
OrmelleseMBerraMBolzoniF. Corrosion inhibitors for chlorides induced corrosion in reinforced concrete structures. Cem Concr Res. 2006; 36: 536–547. doi: 10.1016/j.cemconres.2005.11.007
16.
GarcesPSauraPMendezA. Effect of nitrite in corrosion of reinforcing steel in neutral and acid solutions simulating the electrolytic environments of micropores of concrete in the propagation period. Corros Sci. 2008; 50: 498–509. doi: 10.1016/j.corsci.2007.08.016
17.
AlonsoCAndradeCArgizC. Na PO F as inhibitor of corroding reinforcement in carbonated concrete. Cem Concr Res. 1996; 26: 405–415. doi: 10.1016/S0008-8846(96)85028-9
18.
ChaussadentTNobel-PujolVFarcasF. Effectiveness conditions of sodium monofluorophosphate as a corrosion inhibitor for concrete reinforcements. Cem Concr Res. 2006; 36: 556–561. doi: 10.1016/j.cemconres.2005.09.006
19.
La IglesiaALa IglesiaVMFajardoS. Reaction between sodium monofluorophosphate and portlandite and impact on steel reinforcement corrosion inhibition. Constr Build Mater. 2012; 37: 46–50. doi: 10.1016/j.conbuildmat.2012.07.031
20.
JamilHEMontemorMFBoulifR. An electrochemical and analytical approach to the inhibition mechanism of an amino-alcohol-based corrosion inhibitor for reinforced concrete. Electrochim Acta. 2003; 48: 3509–3518. doi: 10.1016/S0013-4686(03)00472-9
21.
MechmecheLDhouibiLBen OuezdouM. Investigation of the early effectiveness of an amino-alcohol based corrosion inhibitor using simulated pore solutions and mortar specimens. Cem Concr Compos. 2007; 29: 365–372. doi: 10.1016/j.cemconcomp.2006.12.014
22.
OrmelleseMLazzariLGoidanichS. A study of organic substances as inhibitors for chloride-induced corrosion in concrete. Corros Sci. 2009; 51: 2959–2968. doi: 10.1016/j.corsci.2009.08.018
23.
RakantaEZafeiropoulouTBatisG.Corrosion protection of steel with dmea-based organic inhibitor. Constr Build Mater. 2013; 44: 507–513. doi: 10.1016/j.conbuildmat.2013.03.030
24.
FeiFHuJWeiJ. Corrosion performance of steel reinforcement in simulated concrete pore solutions in the presence of imidazoline quaternary ammonium salt corrosion inhibitor. Constr Build Mater. 2014; 70: 43–53. doi: 10.1016/j.conbuildmat.2014.07.082
25.
LeeHSYangHMSinghJK. Corrosion mitigation of steel rebars in chloride contaminated concrete pore solution using inhibitor: an electrochemical investigation. Constr Build Mater. 2018; 173: 443–451. doi: 10.1016/j.conbuildmat.2018.04.069
26.
LotoCAJosephOOLotoRT. Inhibition effect of Vernonia amygdalina extract on the corrosion of mild steel reinfocement in concrete in 3.5% wt. NaCl environment. Int J Electrochem Sci. 2013; 8: 11087–11100.
27.
PalanisamySPMaheswaranGGeetha SelvaraniA. Ricinus communis a green extract for the improvement of anti-corrosion and mechanical properties of reinforcing steel in concrete in chloride media. J Build Eng. 2018; 19: 376–383. doi: 10.1016/j.jobe.2018.05.020
28.
WangZJinMBaiS. Deoxyribonucleic acid as an inhibitor for chloride-induced corrosion of reinforcing steel in simulated concrete pore solutions. Constr Build Mater. 2017; 150: 238–247. doi: 10.1016/j.conbuildmat.2017.03.073
29.
Shakeri FardP.2010. Production and purification of biosurfactants and study of their influence on surface properties of stainless steel and teflon [PhD thesis]. Lille: Université de Lille1: Science and Technology; 2010.
30.
FracchiaLCavalloMMartinottiMG. Biosurfactants and bioemulsifiers biomedical and related applications - present status and future potentials. In: GhistaDhanjoo N, editor. Biomedical science, engineering and technology. Chap. 14. Rijeka: InTechOpen; 2012.
31.
ShubinaVGailletLChaussadentT. Biomolecules as a sustainable protection against corrosion of reinforced carbon steel in concrete. J Clean Prod. 2016; 112 (1): 666–671. doi: 10.1016/j.jclepro.2015.07.124
32.
ShubinaVGailletLAbabou-GirardS. The influence of biosurfactant adsorption on the physicochemicalbehaviour of carbon steel surfaces using contact angle measurementsand x-ray photoelectron spectroscopy. Appl Surf Sci. 2015; 351: 1174–1183. doi: 10.1016/j.apsusc.2015.06.057
33.
ShubinaV.2015. Évaluation des biosurfactants vis-à-vis de la corrosion des armatures du béton armé [PhD thesis]. Nantes: École Centrale de Nantes, 2015.
34.
AngstUElsenerBLarsenCK. Critical chloride content in reinforced concrete – a review. Cem Concr Res. 2009; 39 (12): 1122–1138. doi: 10.1016/j.cemconres.2009.08.006
MeylheucTvan OssCJBellon-FontaineM-N.Adsorption of biosurfactant on solid surfaces and consequences regarding the bioadhesion of Listeria monocytogenes LO28. J Appl Microbiol. 2001; 91: 822–832. doi: 10.1046/j.1365-2672.2001.01455.x
37.
MeylheucTMethivierCRenaultM. Adsorption on stainless steel surfaces of biosurfactants produced by gram-negative and gram-positive bacteria: consequence on the bioadhesive behavior of Listeria monocytogenes. Colloid Surf B Biointerfaces. 2006; 52 (2): 128–137. doi: 10.1016/j.colsurfb.2006.04.016
38.
DagbertCMeylheucTBellon-FontaineMN.Corrosion behaviour of AISI 304 stainless steel in presence of a biosurfactant produced by Pseudomonas fluorescens. Electrochimica Acta. 2006; 51-24: 5221–5227. doi: 10.1016/j.electacta.2006.03.063
39.
DagbertCMeylheucTBellon-FontaineMN.Pit formation on stainless steel surfaces pre-treated with biosurfactants produced by Pseudomonas fluorescens. Electrochimica Acta. 2008; 54 (1): 35–40. doi: 10.1016/j.electacta.2008.02.118
40.
SilvaSNRLFariasCBBRufinoRD. Glycerol as substrate for the production of biosurfactant by Pseudomonas aeruginosa UCP0992. Colloids Surf B Biointerfaces. 2010; 79: 174–183. doi: 10.1016/j.colsurfb.2010.03.050
41.
JanekTAukaszewiczMRezankaT. Isolation and characterization of two new lipopeptide biosurfactants produced by Pseudomonas fluorescens BD5 isolated from water from the Arctic Archipelago of Svalbard. Bioresourses Technol. 2010; 101: 6118–6123. doi: 10.1016/j.biortech.2010.02.109
42.
MankoDZdziennickaAJanczukB.Thermodynamic properties of rhamnolipid micellization and adsorption. Colloids Surf B Biointerfaces. 2014; 119: 22–29. doi: 10.1016/j.colsurfb.2014.04.020
43.
PornsunthorntaweeOChavadejSRujiravanitR.Solution properties and vesicle formation of rhamnolipid biosurfactants produced by Pseudomonas aeruginosa SP4. Colloids Surf B Biointerfaces. 2009; 72: 6–15. doi: 10.1016/j.colsurfb.2009.03.006
44.
LangSWagnerF.Structure and properties of biosurfactants. Biosurfactants and biotechnology. New York (NY): Marcel Dekker; 1981.
BaboianR.Corrosion tests and standards: application and interpretation. 2nd ed. West Conshohocken (PA): ASTM International; 2005.
47.
SternMGearyAL.Electrochemical polarization I. A theoretical analysis of the shape of polarization curves. J Electrochem Soc. 1957; 104: 56–63. doi: 10.1149/1.2428496
48.
FeugeasFTranMChakriS.Bio-based admixture with substances derived from bacteria for the durability of concrete. In: Pacheco-TorgalFMelchersREShiX., editors. Woodhead publishing series in civil and structural engineering, eco-efficient repair and rehabilitation of concrete infrastructures. Sawston: Woodhead Publishing; 2018.
49.
Lartundo-RojasL.Influence de l'adsorption de protéine (BSA) sur le comportement électrochimique et la composition de surface d'un alliage Fe-17Cr en solution aqueuse [PhD thesis]. Paris: Université Paris VI; 2007.
50.
BommersbachP.Evolution des propriétés d'un film inhibiteur de corrosion sous l'influence de la température et des conditions hydrodynamiques: caractérisation par techniques électrochimiques [PhD thesis]. Lyon: INSA Lyon, 2005.
51.
BrugGJVan den EedenALGSluyters-RehbachM. The analysis of electrode impedances complicated by the presence of a constant phase element. J Electroanal Chem Interfacial Electrochem. 1984; 176: 275–295. doi: 10.1016/S0022-0728(84)80324-1
52.
Torres BautistaBEWikienAJDatsenkoI. Influence of extracellular polymeric substances (EPS) from Pseudomonas NCIMB 2021 on the corrosion behaviour of 70Cu-30Ni alloy in seawater. J Electroanal Chem Interfacial Electrochem. 2015; 737: 184–197. doi: 10.1016/j.jelechem.2014.09.024
concentration, the inhibition effect was observed at least for 24 h of immersion.
PO 
F as inhibitor of corroding reinforcement in carbonated concrete