Clays valorization as corrosion inhibitors for E400 reinforcing steel

Abstract

Abstract. The behavior of E400 steel, a constructional steel widely used in Senegal, was studied in aqueous NaCl solution in the presence of two types of clay: volcanic tuffs, and sedimentary montmorillonite. The protection efficiency of these compounds were electrochemically assessed (corrosion potential variation curves, polarization curves and electrochemical impedance spectroscopy) at various inhibitor contents. The results obtained showed that these inhibitors present an inhibitory efficacy of about 70% for an optimal concentration of 0.60% for the tuffs and 62% for a maximum content of 0.50% for montmorillonite.

Evaluation of the inhibitory action of essential oil from Eucalyptus globulus leaves on the corrosion of mild carbon steel in 1M HCl medium

“…We can cite the work on the evaluation of the inhibiting action of the volcanic clay tuffs of Bafoundou carried out by D. Gassama et al [10,11], as well as their work on the evaluation of the inhibiting action of clay compounds of the sedimentary montmorillonite type as corrosion inhibitors for E400 reinforcing steel [11]. These studies resulted in inhibitory efficiencies of up to 70% for volcanic clay tuffs and up to 62% for montmorillonite.…”

Use of Attapulgite as a Corrosion Inhibitor for Industrial Metals and Alloys: Case of Aluminum, Zinc and Aluzinc in a 0.5 M Hydrochloric Acid Solution

“…Because of toxicity concerns, an alternative class of inhibitors called green or ecological inhibitors has emerged, including a wide variety of plant extracts [13,14] and clays [15 -17]. In this context, tuffs [8,9] and montmorillonite [8] have recently been studied in our laboratory as corrosion inhibitors for steel as suspended solids in aqueous solutions. We obtained maximum efficiencies of 62 % for montmorillonite and 70 % for tuffs.…”

Comparative Study of S235 Steel Corrosion Inhibition by <i>Eucalyptus camaldulensis</i> and <i>Cyperus rotundus</i> Essential Oils in Hydrochloric Acid Solution

“…In view of these considerations, intensive research has been carried out on the substitution of toxic inhibitors for less toxic or non-toxic products. The use of clays as inhibitors for S235 steel corrosion has been investigated in our studies [3,4]. Recently several extracts from various parts of plants (leaves, fruits, seeds and flowers) have been used as corrosion inhibitors [5][6][7][8][9][10][11][12][13][14].…”