Electrochemical and AFM studies on adsorption behavior of a Polynuclear Schiff Base at carbon steel in HCl medium

Abstract

The adsorption behavior of a potential polynuclear Schiff base, (s)-2-(anthracen-9(10H)-ylideneamino)-3-phenyl propanoic acid (A9Y3PPA) on carbon steel (CS) in 1M hydrochloric acid solution has been investigated using weight loss measurements, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization studies. The surface morphology of the carbon steel specimens in the presence and absence of the inhibitor was evaluated by AFM analysis. The corrosion inhibition efficiencies of parent amine and parent ketone on carbon steel in 1M HCl solution have also been investigated using weight loss studies. The adsorption of A9Y3PPA obeys Langmuir adsorption isotherm. Thermodynamic parameters (Kads, ∆G 0 ads) were calculated using the adsorption isotherm. Activation parameters of the corrosion process (Ea, ∆H* and ∆S*) were also calculated from the corrosion rates obtained from temperature studies. Tafel plot analysis revealed that A9Y3PPA acts as a mixed type inhibitor. A probable inhibition mechanism was also proposed.

Targeted synthesis of cadmium(ii) Schiff base complexes towards corrosion inhibition on mild steel

“…The i corr values were obtained by extrapolation of liner section of both Tafel curves. The following eqn (7) has been used to calculate the efficiency (h pol (%))…”

“…6 Corrosion inhibition is a surface phenomenon where the adsorption of the organic and inorganic compounds on the metal surface serves as a means of achieving the aim. 7 There are various types of organic and inorganic compounds which have been studied as inhibitors for protecting metals against corrosion. In this scenario, Schiff bases are studied extensively due to the presence of >C]Ngroups which allow the corresponding Schiff bases to get adsorbed on the surface of mild steel and to form a monolayer on the surface spontaneously.…”

Anti-metal Deteriorating and Antiviral Potency of a Novel Polynuclear Schiff base Derived from Anthrone

“…This is due to the interaction of ANHIS The decrease in the I corr value is more at high ANHIS concentration and high inhibition efficiency was obtained (93.12%) for 1mM inhibitor concentration. Furthermore, the addition of ANHIS did not change the value of E corr significantly (shift of E corr is less than 85) 42 which suggests that ANHIS inhibits both anodic and cathodic processes of corrosion (mixed type).…”

Chemical and Electrochemical Study of Effect of Soluble Sulfonated Polystyrene on Mild Steel Interface in Hydrochloric Acid Solution

“…In three separate cases, AFM was used to test the external properties of 0.14%C steel materials, as seen in Figure 6 (a), (b) and (c) [55]. Figure 6(a) displays the surface morphology of the bare mild steel polished surface, while 6(b) and 6(c) reflect the MS specimen without and with an inhibitor, respectively.…”

“…Figure 6. Surface morphological examination of the mild steel sample by atomic force microscopy where, (a) Polished sample (b) Test immersed in 0.5 M HCl without inhibitor for 3 h (c) Test immersed in 0.5 MHCl with 100 ppm of sulphonated polystyrene inhibitor for 3 hours[55] …”