Synergistic inhibition between the gemini surfactant and bromide ion for steel corrosion in sulphuric acid

Abstract

The inhibitive synergistic effect between a cationic gemini surfactant, 1,3-propane-bis(dimethyl dodecylammonium bromide) (12-3-12), and bromide ion for the corrosion inhibition of cold rolled steel in 0.5 mol L -1 H 2 SO 4 was investigated by weight loss, potentiodynamic polarization method and electrochemical impedance spectroscopy (EIS). The inhibition system composed by 12-3-12 and bromide ion is efficient. The adsorption mechanism of the 12-3-12 and bromide ion on steel in acidic medium is discussed on the basis of experimental data and an adsorption model is proposed. Adsorption of inhibitor system on the mild steel surface in acidic medium obeys Langmuir's adsorption isotherm. In addition, potentiodynamic polarization studies show that the system acts as a mixed-type inhibitor. Electrochemical impedance spectroscopy also suggests the formation of a protective layer on the steel surface by the adsorption of surfactant molecules and bromide ions.

Multifunctional Gemini Surfactants: Structure, Synthesis, Properties and Applications

“…Special formulations are prepared based on synergistic effect. Thanks to that, the level of protection is higher, and very often due to synergism effect, less amount of surfactant is needed to protect the metal surface [193,[216][217][218][219]. The biggest consumption of corrosion inhibitors based on cationic gemini surfactants belongs to petrochemical industry.…”

Inhibiting Effects of Rabeprazole Sulfide on the Corrosion of Mild Steel in Acidic Chloride Solution

“…where is the CPE constant, is the angular frequency, 2 = −1 is the imaginary number, and represents phase International Journal of Electrochemistry 7 shift which gives details about the degree of surface inhomogeneity resulting from surface roughness, inhibitor adsorption, porous layer formation, and so forth [37]. Further the double layer capacitance ( dl ) can be calculated by the relation…”

Methylenedisalicylic Acid as a Biocorrosion Inhibitor for Aluminum in Concentrated Sodium Chloride Solutions

“…This permits the development of a biofilm, a biologically active layer of different kinds of microbes as well as mucus that is the result of their metabolic activity. Biofilm creates a good medium for growing microbes and increases the rate of corrosion up to 10,000 times. , The biocorrosion mechanism can be explained on the premise that the biofilm comprises bacterial cells and extracellular polymeric substances (combination of proteins, polysaccharides, fats, and nucleic acids) that facilitate the attachment of bacterial cells to the surface, enhancing the rate of corrosion. The biofilm also involves inorganic sludge from water and/or corrosion products. , …”