Corrosion Inhibition of Carbon Steel in Well Water by L-Cysteine-Zn2+ System

Abstract

The environmental friendly inhibitor system L-cysteine-Zn 2+ has been investigated by weight loss method. A synergistic effect exists between L-cysteine and Zn 2+ system. The formulation consisting of 250 ppm of L-cysteine and 50 ppm of Zn 2+ offers an excellent inhibition efficiency of 99%. Polarization study reveals that this formulation functions as anodic inhibitor. AC impedance spectra reveal that a protective film is formed on the metal surface. FTIR spectra study leads to the conclusion that the Fe 2+ -L-cysteine complex formed on the anodic sites of the metal surface controlled the anodic reaction, and Zn(OH)2 formed on the cathodic sites of the metal surface controlled the cathodic reaction. A suitable mechanism of corrosion inhibition is proposed based on the results obtained from weight loss study and surface analysis technique. Synergism parameters have been calculated. They are found to be greater than 1, suggesting that a synergistic effect exists between L-cysteine and Zn 2+ .

Albumin Protein Adsorption on CoCrMo Implant Alloy: Impact on the Corrosion Behaviour at Localized Scale

“…6,16,17 The atomic bonding of proteins to various metal atoms in implant oxide layers strongly depends on the surface chemistry of the oxide layer including the chemical composition, crystallinity, and defect density. 2,10 Different groups have studied the adsorption mechanisms of protein molecules on solid surfaces as well as the electrochemical interactions between protein molecules and implant surfaces and the corresponding corrosion mechanisms by infrared and Raman spectroscopies, 18,19 ellipsometry, 20,21 quartz crystal microbalance, [22][23][24] atomic force microscopy (AFM), [25][26][27][28][29] scanning tunnelling microscopy (STEM), 30,31 transmission electron microscopy (TEM), 32,33 X-ray photoelectron spectroscopy (XPS), [34][35][36] simulation studies, 37,38 electrochemical measurements, 4,5,15,16,39 and scanning Kelvin probe force microscopy (SKPFM). 12,26 The concept of measuring the difference between the work function energies (WFEs) of two materials was initially established by Lord Kelvin 40 and was physically extended to a Kelvin or capacitive probe and then improved by some researchers.…”

Challenges and Strategies for Optimizing Corrosion and Biodegradation Stability of Biomedical Micro‐ and Nanoswimmers: A Review

“…[26] The corrosion and biodegradation resistances, and biocompatibility of metallic MNSs, whether fully or partially passive, are closely linked to their ability to form a dense, adherent oxide surface layer, typically with thickness in the range of 2-10 nm, which is maintained during in vivo exposure. [72,73] While protective corrosion was not a primary design consideration, there are examples of MNSs that could possess these characteristics, including Al-Ga/Ti, [74] CoNiReP, [63] Ni/Au, [75] and Ni/Ppy (polypyrrole)/PVDF. [76] The distinguishing features of simple or complex oxide films on passive-metallic MNSs and their relative stability can impede electron and metal ion transfer at the electrolyte/solid interface.…”

The inhibition effect of o-nitrophenol and Zn2+ system on corrosion of aluminium

“…It is widely applied in the analysis of corrosion inhibition performance and the interaction of corrosion inhibitors and interfaces [29]. The B3LYP functional was applied within the context of Gaussian 09 [30], using the 6-31+G(d,p) basis set.…”

“…Accurate information about geometrical configuration, electron distribution and quantum chemical calculations were provided by Density Functional Theory (DFT) [29] which is an economic and efficient quantum chemistry computing method. It is widely applied in the analysis of corrosion inhibition performance and the interaction of corrosion inhibitors and interfaces [29].…”