The corrosion characteristics of SS316L stainless steel in a typical acid cleaning solution and its inhibition by 1-benzylimidazole: Weight loss, electrochemical and SEM characterizations


  • K. K. Adama Department of Chemical Engineering, Faculty of Engineering, Edo State University Uzairue, Edo State, Nigeria.
  • I. B. Onyeachu Department of Industrial Chemistry, Faculty of Science, Edo State University Uzairue, Edo State, Nigeria.


Corrosion inhibitor, Stainless steel, Acid cleaning, Imidazole, Polarization


Acid cleaning, an inevitable industrial practice used to descale chemical reactors, usually causes serious corrosion attack on underlying alloy substrates. Ameliorating this phenomenon requires the addition of effective corrosion inhibitors into the acid solution. Current global regulations encourage environmentally–benign molecules as corrosion inhibitors. Consequently, 1-benzylimidazole has been investigated for its inhibitive characteristics against the corrosion of SS316L stainless steel in a typical acid cleaning solution containing 2 % HCl + 3.5 % NaCl. Weight loss measurements confirm that the corrosion inhibition property of 1-benzylimidazole increases with concentration but depreciates with increased temperature. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) measurements confirm that 1-benzylimidazole adsorb on the stainless steel surface to isolate its surface from the acid solution. 1-benzylimidazole is a mixed-type inhibitor with greater anodic influence, and its adsorption enhances the formation and protectiveness of a passive film. Weight loss and the electrochemical measurements agree to an average inhibition efficiency > 70 % at 1000 ppm. The inhibitor adsorbs via physisorption and obeys the Temkin isotherm model. SEM surface characterization confirm the ability of 1-benzylimidazole to protect the surface microstructure of the stainless steel during the corrosion.   


J. Beddoes, J.G. Parr, “Introduction to Stainless Steels”, 3rd ed. (1999), ASM International, Materials Park, Ohio, USA.

Z. Zeng, N. Sakoda, T. Tajiri, S. Kuroda, “Structure and corrosion behaviour of 316L stainless steel coatings formed by HVAF spraying with and without sealing”, Surface and Coatings Technology 203 (2008) 284.

I.B. Onyeachu, M.M. Solomon, “Benzotriazole derivative as an effective corrosion inhibitor for low carbon steel in 1 M HCl and 1 M HCl + 3.5wt.% NaCl solutions”, Journal of Molecular Liquids 313 (2020) 113536.

I.B. Obot, A. Meroufel, I.B. Onyeachu, A. Alenazi, A.A. Sorour, “Corrosion inhibitors for acid cleaning of desalination heat exchangers: Progress, challenges and future perspectives”, Journal of Molecular Liquids 296 (2019) 111760.

S.A. Thakur, G.P. Flake, G.S. Travlos, J.A. Dill, S.L. Grumbein, S.J. Harbo, M.J. Hooth, “Evaluation of propargyl alcohol toxicity and carcinogenicity in F344/N rats and B6C3F1/N mice following whole-body inhalation exposure”. Toxicology 314 (2013) 100.

W.H. Beggs, F.A. Andrews, G.A. Sarosi, “Action of imidazole-containing antifungal drugs”, Life Sciences 28 (1981) 111.

P. Lindberg, P. Nordberg, T. Alminger, A. Brandstorm, B. Wallmark, “The mechanism of action of the antisecretory agent omeprazole”, Journal of Medicinal Chemistry 29 (1986) 1327.

A. Singh, K.R. Ansari, A. Kumar, W. Liu, C. Songsong, Y. Lin, “Electrochemical, surface and quantum chemical studies of novel imidazole derivatives as corrosion inhibitors for J55 steel in sweet corrosive environment”, Journal of Alloys and Compounds 712 (2017) 121.

T. Yan, S. Zhang, L. Feng, Y. Qiang, L. Lu, D. Fu, B. Tan, “Investigation of imidazole derivatives as corrosion inhibitors of copper in sulfuric acid: combination of experimental and theoretical researches”, Journal of the Taiwan Institute of Chemical Engineers 106 (2020) 118.

M. Talari, S.M. Nezhad, S.J. Alavi, M. Mohtashamipour, A. Davoodi, S. Hosseinpour, “Experimental and computational chemistry studies of two imidazole-based compounds as corrosion inhibitors for mild steel in HCl solution”, Journal of Molecular Liquids 286 (2019) 110915.

J. Wang, D. Liu, S. Cao, S. Pan, H. Luo, T. Wang, H. Ding, B.B. Mamba, J. Gui, “Inhibition effect of monomeric/polymerized imidazole zwitterions as corrosion inhibitors for carbon steel in acid medium”, Journal of Molecular Liquids 312 (2020) 113436.

C. Cardona, A.A. Torres, J.M. Miranda-Vidales, J.T. Pérez, M.M. González-Chávez, H. Herrera- Hernández, L. Narváez, “Assessment of Dimethylbenzodiimidazole as Corrosion Inhibitor of Austenitic Stainless Steel Grade 316L in Acid Medium”, Int. J. Electrochemical Science 10 (2015) 1966.

M.T. Zaky, M.I. Nessim, M.A. Deyab, “Synthesis of new ionic liquids based on dicationic imidazolium and their anti-corrosion performances”, Journal of Molecular Liquids 290 (2019) 111230.

Paris Commission (PARCOM) (2006). Protocols on Methods for the Testing of Chemicals Used in the Offshore Oil Industry. Paris, France.

1-benzylimidazole, Material Safety Data Sheet, (Retrieved 16 th January, 2022).

I.B. Onyeachu, D.I. Njoku, S. Kaya, B. El Ibrahimi, C.F Nnadozie, “Sour corrosion of C1018 carbon steel and its inhibition by 1-benzylimidazole: electrochemical, SEM, FTIR and computational assessment”, Adhesion Science and Technology (2021) 1. DOI:10.1080/01694243.2021.1938474.

A. Ismail, H.M. Irshad, A. Zeino, I.H. Toor, “Electrochemical corrosion performance of aromatic functionalized imidazole inhibitor under hydrodynamic conditions on API X65 carbon steel in 1M HCl Solution”, Arabian Journal of Science and Engineering 44 (2019)

H. Kumar, T. Dhanda, “Experimental and theoretical (MDS and FMO) study of 1-Benzylimidazole for mild steel in 0.1 N H 2 SO 4 at normal and elevated temperatures: An efficient anti-pitting and anti-cracking agent”, Journal of Molecular Structure 1231 (2021) 129958.

I.B. Obot, M.M. Solomon, I.B. Onyeachu, S.A. Umoren, A. Meroufel, A. Alenazi, A.A. Sorour, “Development of a green corrosion inhibitor for use in acid cleaning of MSF desalination plant”, Desalination 495 (2020) 114675.

ASTM-G 01-03, Standard practice for preparing, cleaning, and evaluation corrosion test specimens, ASTM Book of Standards (Re-approved 1997).

I.B. Onyeachu, M.M. Solomon, S.A. Umoren, I.B. Obot, A.A. Sorour, “Corrosion inhibition effect of a benzimidazole derivative on heat exchange tubing materials during acid cleaning of multistage flash desalination plants”, Desalination 479 (2020) 114283.

C.C. Ahanotu, I.B. Onyeachu, M.M. Solomon, I.S. Chikwe, O.B. Chikwe, C.A. Eziukwu, “Pterocarpus santalinoides leaves extract as a sustainable and potent inhibitor for low carbon steel in a simulated pickling medium”, Sustainable Chemistry and Pharmacy 15 (2020) 100196.

O.A. Akinbulumo, O.J. Odejobi, E.L. Odekanle, “Thermodynamics and adsorption study of the corrosion inhibition of mild steel by Euphorbia heterophylla L. extract in 1.5 M HCl”, Results Mater. 5 (2020) 100074.

S. Chaudhary, R.K. Tak, “Natural corrosion inhibition and adsorption characteristics of Tribulus terrestris plant extract on aluminium in hydrochloric acid environment”, Biointerface Research in Applied Chemistry 12 (2022) 2603.

A. Espinoza-Vazquez, F.J. Rodriguez-Gomez, “Caffeine and nicotine in 3 % NaCl solution with CO 2 as corrosion inhibitors for low carbon steel”, RSC Advances 6 (2016) 70226.

C.H. Hsu, F. Mansfeld, “Technical note: concerning the conversion of the constant phase element parameter Y o into a capacitance”, Corrosion 57 (2001) 747.

H.H. Strehblow, “Passivity of metals studied by surface analytical methods, a review”, Electrochimica Acta 212 (2016) 630.

M. Stern, A.L. Geary, “Electrochemical polarization, 1. A theoretical analysis of the shape of polarization curves”, The Electrochemical Society 104 (1957) 751.



How to Cite

The corrosion characteristics of SS316L stainless steel in a typical acid cleaning solution and its inhibition by 1-benzylimidazole: Weight loss, electrochemical and SEM characterizations. (2022). Journal of the Nigerian Society of Physical Sciences, 4(2), 214-222.



Original Research

How to Cite

The corrosion characteristics of SS316L stainless steel in a typical acid cleaning solution and its inhibition by 1-benzylimidazole: Weight loss, electrochemical and SEM characterizations. (2022). Journal of the Nigerian Society of Physical Sciences, 4(2), 214-222.