Use of Experimental Designs to Evaluate the Influence of Methyl Green Dye as a Corrosion Inhibitor for Carbon Steel in Perchloric Acid

Abstract

The aim of this research study was to apply experimental design in the optimization of influencing parameters on the corrosion inhibition efficiency of Methyl Green (MG) dye using the weight loss (WL) technique. Corrosion inhibition of carbon steel (CS) in the presence of different concentrations of MG dye in 1 M HClO4 solution has been studied. Results showed that inhibition efficiency (IE) increased with increasing concentration of MG dye up to 1.0 × 10 −3 mol/L, and decreased with raising temperature. The free energy values calculated from the Langmuir adsorption isotherm for MG dye (-36.24 to -38.04 kJ/mol) suggested that MG dye molecules adsorbed onto CS surface via a physicochemical mechanism.

Studying the Effectiveness of an Expired Betamethasone Drug in Sulfuric Acid Solutions to Examine the Corrosive Behavior of Copper Using Weight Loss and Experimental Design

“…The IE attains its peak value at the lowest temperature (20 °C) and shortest immersion time (0.5 h), along with the highest concentration of Betamethasone drug, as illustrated in Figure 5. These results align with findings reported in the literature (56).…”

“…The current model's prediction of more than 99.9% response variability is shown by the determination coefficient (R 2 ) value of 0.999. A model is classified as excellent when its Q2 value exceeds 0.9 (56). Furthermore, in this study, a reliable model typically exhibits a difference between R 2 and Q 2 of less than 0.3; here, the difference is merely 0.01.…”

“…It was determined that the model was highly significant, and values for R 2 and R 2 Adj exceeding 0.99 demonstrated an exceptional agreement between predicted and experimental inhibition efficiency in the drug betamethasone (36). A robust model with a low RSD value closely fits the observed results with the expected values (56).…”