Water-Soluble Polyaniline–Polyacrylic Acid Composites as Efficient Corrosion Inhibitors for 316SS

Abstract

Water-soluble polyaniline–poly­(acrylic acid) (PANI–PAA) composites with excellent processability and electroactivity were prepared by a one-step in situ polymerization. PAA as a matrix not only improves the solubility of PANI in water but also prevents the formation of macroscopic PANI clusters. The corrosion-inhibition performance of 316 stainless steel (316SS) was evaluated in 0.5 M HCl by electrochemical measurements in the presence of PANI–PAA composites. The results show that PANI–PAA acts as a mixed-type inhibitor, and its inhibition efficiency (IE (R)) increases with inhibitor concentration. The adsorption of the inhibitor on 316SS surface obeys a Langmuir adsorption isotherm. The PANI–PAA composite with an optimized concentration of 200 ppm shows marked increase in IE (R), i.e., 91.68%. The enhanced efficiency is attributed to an insulating interfacial layer formed by the adsorption of PANI–PAA, which obstructs the corrosion reaction at the interface.

Polyaniline/chitosan as a corrosion inhibitor for mild steel in acidic medium

“…This increase in diameter indicated increased corrosion resistance of Q235 steel, with adsorption of the PANI/CTS inhibitor on its surface resulting in double layer charging effects that produce faradaic impedance processes at the reaction interface. [44][45][46] Fig. 4(b and c) represents the corresponding Bode and phase angle plots of PANI/CTS, respectively.…”

3D printing of conjugated polymers

“…. Many groups have utilized formation of the salt to attenuate the physical properties of PANI via complexation with tailored counterions . In this work, the team studied the complexation of dodecylbenzenesulfonic acid (DBSA) with PANI, and how the processing conditions affect final paste rheology and printing …”

“…39 Many groups have utilized formation of the salt to attenuate the physical properties of PANI via complexation with tailored counterions. [40][41][42] In this work, the team studied the complexation of dodecylbenzenesulfonic acid (DBSA) with PANI, and how the processing conditions affect final paste rheology and printing. 43 To begin, the team took inspiration from previous work that had described doping of PANI with DBSA under different thermal conditions.…”

Experimental and DFT studies of porous carbon covalently functionalized by polyaniline as a corrosion inhibition barrier on nickel-based alloys in acidic media

“…8 Meng et al studied polyaniline polyacrylic acid functionalized material as a corrosion inhibitor in NaCl medium on mild steel and noticed that with the increase of amount of the composite material corrosion inhibition efficiency increased. 9 Chen and Liu investigated the corrosion inhibition in 3.5% NaCl medium of mild steel covered by phosphorylated polyvinyl alcohol particles decorated by polyaniline and by epoxy coating. 10 The inhibition efficiency for the polyaniline coated mild steel was increased due to the physisorption on the steel surface, and epoxy coated mild steel inhibition efficiency was decreased due to attack of chloride ions on the steel surface.…”