Inhibitory Effect of Piper Nigrum L. Extract on the Corrosion of Mild Steel in Acidic Media

Abstract

Corrosion inhibitors have been used to preserve the integrity of metal components of plant facilities under severe corrosive conditions that would lead to failure or reduction of the operating cycle of essential units. These include risers, columns, wells, pipelines, pressure vessels and distillation towers structures. Several compound classes have been studied as corrosion inhibitors for metallic materials. In special, organic compounds have been tested and applied industrially as corrosion inhibitors due to their low toxicity. Taking into account recent recommendations for eliminating the use of toxic inorganic inhibitors there was a significant increase in studies on the use of natural products as corrosion inhibitors. Natural products are considered environmentally suitable corrosion inhibitors for use on a large scale. Recent studies have shown that black pepper extract is rich in a mixture of alkaloids substances that have excellent anti-corrosion properties in acid conditions. The aim of this study was to investigate the carbon steel corrosion inhibition efficiency of black pepper crude extract and purified piperine (major alkaloid present in the extract) in highly corrosive environment by weight loss measurements. For this reason, weight loss tests were carried out to study the inhibition efficiency. The inhibition efficiencies of different concentrations of the black pepper crude extract was higher than the efficiencies of the same concentrations of pure piperine. The efficiencies were about 97 % for the crude extract and 70 % for the pure piperine.

Application of an Aqueous Extract of Cotton Seed as a Corrosion Inhibitor for Mild Steel in HCl Media

“…The behavior seen with the HMWF where the IE was equal to its total extract (ACSE) was also seen in our previous works with gorse, coffee husk and grains, biomass of Spirulina Maxima microalgae and barley agro-industrial residues aqueous extracts [10][11][12]16,21,23,24 . All these studies reinforce the hypothesis that macromolecules (proteins or polysaccharides) are probably responsible for the inhibitive action which would explain the deviation of a unit in the angular coefficient of Langmuir equation, allowing to suggest that the relation between active site for each adsorbed molecule is not of one unit [9][10][11][12][13][14][15][16][17][18][19][20][21]39 .…”

“…The gravimetric measurements have been detailed in our previous works [7][8][9][10][11][12][13][14][15][16] . Initially, the weight loss measurements were performed with different immersion times (2, 4 and 24 h) and varying the concentrations of the extract in 100, 200, 400 and 800 mg L −1 .…”

“…Adding small amounts of these natural extracts in solution may decrease the corrosion rate of the metal [14][15][16][17][18] . Natural inhibitors, for the most part, are considered adsorption inhibitors because they create a barrier between metal and electrolyte by blocking active sites and reducing metal dissolution and/or reduction reaction 19 .…”

Main pests and diseases affecting black pepper in family production systems in Capitão Poço, Pará, Brazil

“…About 85% of national production comes from family farming, generating 30,000 direct jobs during the year, and reaching 80 thousand at harvest time. It has high economic value and is widely used in agroindustry, food and chemical industry (Assis et al 2015).…”

Aqueous Agro-Industrial Waste as Corrosion Inhibitor for Stainless Steel AISI 304 in Acidic Media

“…Natural substances extracted from herbs, plants or spices with antioxidant properties are known as green corrosion inhibitors. These substances are extracted by simple procedures, with low cost and provide great inhibition efficiencies when added to the reactional media in the proper concentration 7 .…”