Cationic Surfactant - Zn+2 Systems as Mixed Corrosion Inhibitors for Carbon Steel in a Sodium Chloride Corrosive Medium

Abstract

Benzyl dimethyl dodecyl ammonium chloride-zinc ion system, as quaternary ammonium salt (QA-Zn +2), was investigated as corrosion inhibitor for carbon steel in a 2.0 M sodium chloride solution, by different techniques such as weight loss, open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopic techniques. The inhibition efficiency of the used system (QA-Zn +2) increases with increasing mixed inhibitor concentrations and with rising temperatures. A synergistic effect exists between QA and Zn +2. Potentiodynamic polarization curves indicate that the used system mainly acts as an anodic mixed inhibitor. The polarization resistance values were (Rp) increased, and the interface capacitance (Cdl) was decreased in the mixed inhibitor system (QA-Zn +2) presence, more than in the case of individual inhibitors. The corrosion inhibition is due to the adsorption of (QA-Zn +2) onto the metal surface, and the formation of a barrier film that separates the metal from the corrosive medium. The maximum inhibition efficiency of 98% was obtained at 200 QA and 50 ppm Zn +2 of the mixed inhibitor system, due to a synergistic effect.

Green Recycling of Poly(ethylene terephthalate) Waste as Corrosion Inhibitor for Steel in Marine Environment

“…The inhibitors raise the free corrosion potential of steel (shifted it to more noble values) compared to the blank solution. This initially indicates that the studied inhibitors act as anodic inhibitor [29][30][31][32][33]. In all curves the steady-state values are always more negative than the immersion potential suggesting that before the steady state condition is achieved the steel oxide film has to dissolve [29-33].…”

Analytical and electroanalytical techniques in the determination of (Fe+2) results from iron corrosion: effect of omeprazole drugs as green inhibitors

“…where f max is the frequency at the top of the semicircle (where Z is maximum). The proposed equivalent circuit represents electrode impedance in Figure 6, Z, in this case given by the mathematical equation (3,5):…”

“…The analytical and electroanalytical techniques are widely used in the determination of ferrous ion and the rate of corrosion of iron in different corrosive medium and at different pH (1)(2)(3)(4)(5)(6)(7)(8)(9). Ferrous ions in aqueous medium result from the iron corrosion, when the iron metal is subjected to corrosive environment, it is directly changed into ferrous ion in the solution and consequently the metal is damaged; the rate of corrosion and metal damaged is determined gravimetrically by the ferrous ion concentration passing into the solution, as the rate of corrosion increases, the concentrations of ferrous ions in the corrosive medium increase and vice versa.…”

“…He concluded that the analytical techniques were effective for the evaluation of the corrosion inhibition performance; different analytical and electroanalytical techniques were used to evaluate the corrosion inhibition efficiency of inhibitors (32)(33)(34), AAS was made available to the routine laboratory as an analytical technique that initially was intended to produce considerable simplification of procedures for the analysis of aqueous, acidic, or basic solutions, and thereby contribute to a reduction in costs. The industrial application of atomic absorption for routine analysis is divided into four areas: (1) the incoming inspection of all raw materials, (2) production testing, (3) final inspection of all products, and (4) environmental analysis. For rapid analysis during the production process, atomic absorption is mainly of an indirect value because, as the sequential character of the technique, it cannot be used for complete steel or slag analysis in a two-to three-minute period (35).…”

Synergistic effect of different Zn salts with sodium octanoate on the corrosion inhibition of carbon steel in cooling water

“…The cathodic reaction is inhibited by deposition of Zn (OH) 2 on the cathodic sites (Rajendran, Maria Joany, Apparao, & Palaniswamy, 2002;Rathore, Ishratullah, Varshney, Varshney, & Mojumdar, 2008). Zinc cations Zn 2+ were also found to act synergistically with benzyl dimethyl dodecyl ammonium chloride for corrosion inhibition of carbon steel in 2 M sodium chloride solution (Abdel Hameed, 2018).…”