Inhibitive and adsorption behaviour of carboxymethyl cellulose on mild steel corrosion in sulphuric acid solution

The Corrosion Inhibition of Mild Steel in Sulphuric Acid Solution by Adsorption of African Perquetina Leaves Extract

“…The decrease in inhibition efficiency was as a result of desorption of some inhibitor substituent as lower value is obtained at 60 0 C (75.82 %) compared to the inhibition efficiency at 30 0 C (87.78 %). It has been established that increase in temperature leads to gradual desorption of the outer layer of dimeric inhibitor film and at the same time the underlying layer effectively protect the metal surface from acid attack [16]. Furthermore, the complex effect of temperature on the inhibited acid-metal reaction result from the changes in the metal surface such as rapid etching, desorption of inhibitor itself and inhibitor undergoing decomposition/ or rearrangement which contribute to this observed effect/ behavior [16].…”

“…Figure 4 represents Graph of hydrogen gas evolved versus time at 30 and 60 o C temperatures to obtain slopes which were taken as the hydrogen evolution rate or corrosion rate. efficiency is due to the presence of mill scale on the mild steel specimen used in the corrosion study [16]. Gasometric parameters obtained which include volume of hydrogen gas evolved, the slope (hydrogen evolution rate), and inhibition efficiency are listed in Table 4 at all investigated temperature.…”

“…It has been established that increase in temperature leads to gradual desorption of the outer layer of dimeric inhibitor film and at the same time the underlying layer effectively protect the metal surface from acid attack [16]. Furthermore, the complex effect of temperature on the inhibited acid-metal reaction result from the changes in the metal surface such as rapid etching, desorption of inhibitor itself and inhibitor undergoing decomposition/ or rearrangement which contribute to this observed effect/ behavior [16]. Therefore exposure of mild steel to acidic media for longer period of time results in high corrosion rate and fall of inhibition efficiency at elevated temperature.…”

“…The experiment was repeated in the absence and presence of different concentrations of studied inhibitors. Computation reaction number was calculated as obtained in the past literature ( [15][16]. As below:…”

Comparative study of the inhibitive action between the bitter orange leaf extract and its chemical constituent linalool on the mild steel corrosion in HCl solution

“…Nevertheless, most of these compounds are costly, as well as dangerous to living beings. [3][4][5] Plant extracts have become important as environmentally acceptable and rich sources of active chemical ingredients. 6 Studies showed that some of the plant extracts have inhibition efficiency exceed 90%.…”