Tannic acid as corrosion inhibitor for metals and alloys

Abstract

Reduction of environmental impacts caused by pollution harmful to metals and alloys is very important. The atmospheric corrosion is a serious problem due to economic and environmental losses. Thus it is important to properly prevent corrosion phenomena. Tannic acid is one of natural, non-toxic, and environment friendly inhibitors of corrosion. The inhibitive action of tannic acid was investigated using linear polarization resistance method. The corrosion parameters: corrosion potential and current as well as polarisation resistance, were determined. Corrosion rate and inhibitive efficiency was calculated for two series of tested samples (metals and alloys). An inhibitive effect of tannic acid concentration and immersion number in tannic acid solution on metal and alloys corrosion was described. Copper appeared to be the most resistant metal to corrosion in the presence of tannic acid. Higher inhibitive efficiency of tannic aid was observed in the case of Inconel 625 alloy than steel due to higher content of Cr and lower content of Fe.

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Enhanced corrosion inhibition effect of tannic acid in the presence of gallic acid at mild steel/HCl acid solution interface

“…Tannic acid (TA) (Fig. 1), which belongs to the class of natural, non-toxic and environmentally friendly compounds has been reported recently as corrosion inhibitor for steel, Cu and Zn in atmospheric condition [11]. The results obtained indicate that steel was the least protected while Cu was the best protected.…”

Adsorption and corrosion inhibition properties of pyridine‐2‐aldehyde‐2‐quinolylhydrazone for Q235 steel in acid medium: Electrochemical, thermodynamic, and surface studies

“…In oilfield mining and industrial pickling, the extensive use of hydrochloric acid has caused severe corrosion to metal pipes and equipment, and thus induced huge economic losses and serious environmental pollution . A good solution to this problem is to use corrosion inhibitors due to their excellent inhibition efficiency and considerable economic benefit.…”

“…In oilfield mining and industrial pickling, the extensive use of hydrochloric acid has caused severe corrosion to metal pipes and equipment, and thus induced huge economic losses and serious environmental pollution. [1][2][3] A good solution to this problem is to use corrosion inhibitors due to their excellent inhibition efficiency and considerable economic benefit. The reported inhibitors against steel corrosion in acidic medium are usually heterocyclic organic compounds containing highly electronegative atoms in their molecular structures, such as nitrogen, oxygen, sulfur, phosphorus, unsaturated bonds, or large conjugation system.…”