A novel water‐soluble, conducting polymer composite for mild steel acid corrosion inhibition

Abstract

A novel water‐soluble conducting polymer composite, poly(vinyl alcohol‐histidine) was synthesized from aqueous solution by free radical condensation using persulfate. The composite was characterized using UV–Visible, Fourier transform infrared, scanning electron microscopy, thermogravimetric analysis (TG/DTG), and differential scanning calorimetry techniques while its AC conductance was measured by LCZ analyzer. The inhibitive action of the composite on the corrosion behavior of mild steel in 1M HCl was studied by conventional weight loss method, potentiodynamic polarization studies (Tafel), linear polarization studies, and electrochemical impedance spectroscopy. The effects of inhibitor concentrations, exposure time, and temperature have been investigated. The corrosion rate, inhibition efficiency (IE), and other parameters have been evaluated for different inhibitor concentrations. The composite provided more than 95% IE at an optimum concentration of 0.6% by weight. The results showed the composite as an effective mixed type inhibitor. The adsorption of this inhibitor obeyed Temkin adsorption isotherm. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Poly(vinyl alcohol–proline) as corrosion inhibitor for mild steel in 1M hydrochloric acid

“…With further increase in temperature, inhibition efficiency decreases which indicate the instability of the adsorbed film above 50°C. Similar type results were observed for the other amino acid polyvinyl alcohol composites [16,17]. The increased hydrogen liberation caused the adsorbed polymer film to peel off from the metal surface there by exposing the base metal to acid which is susceptible for the corrosion attack.…”

“…Polyvinyl alcohol was reported as a corrosion inhibitor with 50-70 % [11][12][13][14] inhibition efficiency depending on the metal-acid system. In our previous communications polyvinyl alcohol was composited with various amino acids like leucine, histidine, threonine, and cysteine which are reported to have more than 92 % inhibition efficiency in 1M HCl [15][16][17]. The present investigation reports the corrosion inhibition performances of poly(vinyl alcohol-proline) composite.…”

“…The monitoring parameter is the mass loss resulted from the treatment of MS specimens with the aggressive solution. The corrosion rate surface coverage and inhibition efficiency of PVAP were calculated from the monitoring parameter using the standard relations as explained in our previous communications [15,16].…”

Polyvinyl alcohol (PVA) as a biodegradable polymeric anticorrosive material: A review on present advancements and future directions

“…This group of authors also reported a comparison between the %IE of PVA and PEG (polyethylene glycol) for MS and aluminium corrosion in 0.1 M H 2 SO 4 using gravimetric, hydrogen evolution and thermometric methods and detected that both PVA and PEG displayed practically analogous efficiency [49,74]. Later on, many authors modified the PVA using different substrates the used them as corrosion inhibitors for better performance [75][76][77][78].…”

Synthesis and inhibition of N-alkyl-2-(4-hydroxybut-2-ynyl) pyridinium bromide for mild steel in acid solution: Box–Behnken design optimization and mechanism probe

“…Mild steel is commonly used in oil and gas production industries among others [1]. One of the major problems in these sectors is the damage caused by corrosion of materials in acidic environments [2].…”