Surface assimilation and corrosion inhibition characteristic of water soluble Polyvinyl Alcohol on mild steel surface in 0.5M HCl solution

Abstract

As corrosion inhibitors for mild steel in acidic media, polymers are emerging materials due to its larger surface coverage area. This paper focuses on the characteristic of water-soluble solvent polyvinyl alcohol (PVA) at interface of mild steel under 0.5 M HCl, examined using electrochemical impedance spectroscopy, Tafel polarization, and weight reduction techniques. The findings of the study revealed that water-soluble polyvinyl alcohol as polymer inhibitor has restraint abilities, up to 93.7 percent for 3 hours in 0.5 M hydrochloric acid. An advanced form of high spatial resolution imaging of surface of mild steel at different stages was found by using scanning electron microscopy which shows that the sample immersed for 3 hrs in 0.5 M HCl with 100 ppm of water soulble PVA inhibitor provides good inhibition quality to corrosion on mild steel surface.

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

“…All the corrosion studies like emaciation of metal and with the interconversion of chemical and electrical energy examination were performed on cold rolled mild steel metal strip of 10cm 2 surface area with thickness of 0.025cm, having structure (wt.%): 0.03% Phosphorus, 0.20% Copper, 0.35% Manganese, 0.17% Silicon, 0.025% Sulphur, 0.14% Carbon and rest iron [26,28]. An emery paper of grade 600 to 1200 mesh in -1 was used to graze the additional Fe and polish the metal as like mirror finish [29].…”

“…A solution of acid for 0.5M HCl of AR group and SPS of Merck India has been used with various concentrations at submerged mild steel area. The test bed was prepared by the methods stated in previous research paper [26,34]. SPS has been tested and reviewed in the paper and has been used as primary inhibitor in this research article.…”

“…According to the weight loss method, a 10cm 2 surface zone of 0.14% carbon steel was immersed at 35°C with ±1 °C heat tolerance every time in 0.5M HCl for 3h term in triplicate manner to find the average weight loss of each strip, using shimadzu balance, model AY62, for varying inhibitor value in combination with acid, whereas, mathematical relation existed established to report effectiveness of SPS inhibition on specimen surface in percentage, effective area () and decay value (mmpy) in acidic medium for specimen has been reported somewhere [26,35]. The adhesion of molecules and ions, to study the adsorption study of SPS on metal strip surface has been reported somewhere else [35] finding the natural, electrical potential shift in the characteristic of the solution interface utilizing several forms of isotherms [36].…”

“…To examine the electrochemical potentiodynamic effects on the mild steel surface, a computer controlled Potenentiostat / galvanostat instruments of model 1010E make Gamry instruments Inc. USA [11,37], were arranged with a mild steel strip of 1cm 2 of the exposed portion serves as the working probe, while calomel serves as an auxiliary probe and platinum foil serves as the reference probe, all has been prepared with surface cleaning method [38,39] for a three electrode assembly setup and arranged in a compartment for electrochemical examination of corrosion on mild steel surface. After steady state for further examinations, the tafel and linear polarization resistance, as well as differential thermal analysis, were reported for corrosion potential (Ecorr), anodic (βa) and cathodic (βc) tafel slopes, and corrosion current density (Icorr) at -0.25V to +0.25V with an average scan rate of 0.5 mV/sec [26,40,41].…”

“…It has also been discovered from the past studies while the plant concentrates and oils show corrosion efficiency up to 98% [16,17], and shows that plant concentrates and oils are compelling inhibitors and can be effectively utilized at the modern level but the writing also uncovers that a wide scope of polymeric mixtures have been effectively examined and found to be more effective as compared to others [18,19], as potential inhibitors of corrosive environment in a dynamic media. Water soluble polymers like Polyvinyl alcohol, Polyacrylic acid, Poly(aniline-formaldehyde), Poly(o-toluedine-formaldehyde), Poly(p-chloroanilnie-formaldehyde), Hexahydro-1,3,5-triphenyl-striazine, Hexahydro-1,3,5-p-methoxyphenyl-s-triazine 3-anilinomethylpropionate and many more have been reported to be best suited inhibitor in their individual class for metals [20][21][22][23][24][25][26][27]. It was concluded the advantages of linear ionic polymer to be much better used over crossed linked polymers because of their solubility in water and ion exchange properties.…”