Corrosion inhibition of aluminum with a 3‐(10‐sodium sulfonate decyloxy) aniline monomeric surfactant and its analog polymer in a 0.5M hydrochloric acid solution

Abstract

ABSTRACT:The inhibitory effect of a 3-(10-sodium sulfonate decyloxy) aniline monomeric surfactant and the analog polymeric surfactant poly[3-(decyloxy sulfonic acid) aniline] (PC 10 ) on the corrosion of aluminum in 0.5M hydrochloric acid was studied with weight loss and potentiodynamic polarization techniques. The results show that the inhibition occurred through the adsorption of inhibitor molecules on the metal surface. The inhibition efficiency was found to increase with increasing inhibitor concentration and decrease with increasing temperature. It was found that these inhibitors acted as mixed-type inhibitors with anodic predominance. The adsorption of these compounds on the metal surface obeyed the Langmuir and Frumkin adsorption isotherms. Thermodynamic functions for both the dissolution and adsorption processes were determined. The obtained results from the weight loss and potentiodynamic polarization techniques were in a good agreement.

Experimental and Theoretical Evaluation on the Effect of the Terminal Side Chain of a Polymeric Surfactant on the Inhibition Efficiency of Aluminum Corrosion in Acid Medium

“…Values of C i are the concentration of the inhibitor in bulk solution, θ is the surface coverage (θ = P/100) and K ads is the adsorption equilibrium constant. Frumkin isotherm [18,19] was also found to fit well with the obtained experimental data, as represented in Fig. 4.…”

“…The more positive value of (a), the steeper is the adsorption isotherm. The apparent thermodynamic parameters (∆H ads and ∆S ads ) for the surfactant adsorption on the aluminum surface in 0.5 M HCl at different temperatures were determined from the slopes and intercepts of the lines of log K ads vs. 1/T plots using the following equation [18,19]:…”

“…Results indicate that the hydrophilic side chain has remarkable influence on the inhibition efficiency of the prepared surfactants and the inhibition efficiency increases in both monomeric and polymeric surfactants as the length of the side chain increases. Effect of 3-(10-sodiumsulfonate decyloxy) aniline monomeric surfactant and its analog polymer on the corrosion of aluminum in 0.5 M HCl was studied [19]. The results indicate that the inhibition occurs through the adsorption of surfactant molecules on the aluminum surface as well as the inhibition efficiency increases with increasing the inhibitor concentrations, and decreases with raising the temperature.…”

Effect ofortho-substituted aniline on the corrosion protection of aluminum in 2 mol/L H2SO4solution

“…Organic compounds containing hetero-atoms and an aromatic ring are widely used to protect metals against the acidic corrosion as a result of sharing theirand lone pair of electrons with the vacant orbitals of the metal; therefore, the monomeric and polymeric aromatic amines are considered good corrosion inhibitors. [1][2][3][4] Corrosion protection of QD36 steel in 0.5 mol/L HCl solution using aniline, p-toluidine, and p-anisidine was investigated. 3 The data shows that the corrosion protection occurred through the adsorption of these compounds on steel substrate and the protection efficiencies were enhanced with increasing inhibitor concentrations in the following order: p-anisidine > p-toluidine > aniline.…”

Effect of polyvinylpyrrolidone – polyethylene glycol blends on the corrosion inhibition of aluminium in HCl solution

“…Application of some natural and synthetic polymers as corrosion inhibitors for aluminium in different corrosive environments has been reported by some research groups. For instance, there have been reports on the use of polyvinylpyrrolidone (PVP; , polyvinyl alcohol (Umoren et al, 2007a(Umoren et al, , 2007b, starch (Rosliza and WanNik, 2010), polyacrylic acid (Amin et al, 2009), gum arabic (Umoren, 2008;Umoren et al, 2006a), polyethylene glycol (PEG; Abdallah et al, 2011), polyacrylamide , 3-(10-sodium sulphonate decyloxy) aniline polymer (El-Deed and Mohamed, 2011) and iota-carrageenan natural polymer (Fares et al, 2012) as inhibitors for aluminium corrosion in acidic, neutral (sea water) and alkaline media. In some cases, their inhibition efficiency has been upgraded by addition of small amount of anions (Cl Ϫ , Br Ϫ and I Ϫ ), which functioned by exerting synergistic action (Umoren et al, 2007a(Umoren et al, , 2007bUmoren et al, 2009aUmoren et al, , 2009bUmoren, 2009a;Umoren and Solomon, 2010;Ebenso et al, 2006).…”