Ceratonia siliqua extractas a green corrosion inhibitor for copper and brass in nitric acid solutions

Abstract

The influence of extract of ceratonia siliqua extract on the corrosion of copper and brass in aqueous 1 M nitric acid was examined by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy and electrochemical frequency modulation techniques. The surface morphology was analyzed using scanning electron microscope and energy dispersive X-ray techniques. Potentiodynamic polarization curves indicated that the plant extract behaves as cathodic inhibitor. The results indicate that the extract solution of the plant could serve as an effective inhibitor for the corrosion of copper and brass in nitric acid media. As temperature increases, percentage of inhibition decreases. The degree of surface coverage of the adsorbed inhibitor was determined by weight-loss technique, and it was found that the results obeyed the Langmuir adsorption isotherm. ARTICLE HISTORY

Assessment of theBassia muricataextract as a green corrosion inhibitor for aluminum in acidic solution

“…The average weight loss of seven equivalent aluminum sheets could be achieved. The surface coverage (θ) and the inhibition efficiency (IE%) of the B. muricata extract for the corrosion of aluminum were computed as follows (27)(28)(29):…”

Inhibitive effect of Artemisia Judaica Herbs extract on the corrosion of carbon steel in hydrochloric acid solutions

“…Straight lines were obtained by plotting Langmuir adsorption isotherm at various temperatures (with slopes almost equal to unity), as shown in Figure (8). around (-20 kJ mol -1 ) (physical adsorption) whilst those around (-40 kJ mol -1 ) (chemisorption) [43,44]. For the situation of this review, the 0 ads G  values were confined between 20.2 kJ mol -1 and 27.5 kJ mol -1 , this may show that both physical and chemical adsorption occurred [45].…”

CAROB (Ceratonia siliqua): HEALTH, MEDICINE, CHEMISTRY

“…This property enable extracts of Carob being corrosion inhibitors. 136 One of the new polyphenolic that were isolated for the first time from Carob is ceratoside, that its structure is shown in Figure 3. 108 Hydrolysis (degradation) of condensed tannins which are polyphenols attached by glycosyl bonds to sugars can be done in several reactions.…”

“…135 Dry pod methanolic extract found to be active corrosion inhibitor of copper and brass in aqueous 1 M HNO3. 136 Bark was cleaned and treated for biosorption of heavy metals (Zn ). Different variables are discussed and pH, metal concentration, contact time, adsorbent dose have been optimized.…”