Conifer Cone (Pinus resinosa) as a Green Corrosion Inhibitor for Steel Rebar in Chloride-Contaminated Synthetic Concrete Pore Solutions

Abstract

The present study has been focused on the environment-friendly corrosion inhibitor. Conifer cone (Pinus resinosa) has been used as a novel corrosion inhibitor to mitigate the corrosion of steel rebars in simulated concrete pore solutions (SCPS) in the presence and absence of chloride ions. The corrosion inhibitor is extracted by simple chemical methods. The functional groups present in the extracted conifer cone (ECC) powder are characterized as well as the surface morphology of ECC has been examined. The corrosion inhibition performance has been evaluated by the electrochemical and weight loss methods. The experimental results indicate that ECC possesses a corrosion inhibition efficiency of 81.2% at a dosage of 1000 mg·L–1, after 720 h of immersion in chloride-contaminated SCPS. Adsorption isotherm and their standard Gibbs free energy (ΔG ads 0) values are calculated by Langmuir, Freundlich, and Temkin isotherm methods, and the results indicate that the ECC is initially adsorbed on the steel rebar surface by physisorption and then it turns to chemisorption. The steel rebar surfaces have been characterized after exposure to the ECC containing SCPS, and the results indicate that the ECC containing cationic adsorbate molecules, which interact with steel rebar, leads to retardation of metal dissolution in corrosive chloride medium.

Inhibition Effect and Mechanism of 2-Mercaptopyrimidine on Cobalt-Based Copper Interconnects Chemical Mechanical Polishing: Combined Experimental and DFT Study

“…Meanwhile, high frequency region, the values of the maximum phase angles are also much higher than the Ref solution, indicating the Cu and Co surface are formed by strong passivation film. 46 Figure 7 showed the EEC, which fitted from impedance spectra. The individual element values of the circuit are shown in Table III.…”

Multi-Scale Insight into Inhibition Mechanism of Benzo Derivatives in Chemical Mechanical Polishing of Copper Film Based on Experiments and Theoretical Calculations

“…Meanwhile, in medium and low frequencies region, the values of the maximum phase angles are also much higher than the Ref solution, indicating the Cu surface is formed by a strong passivation film. 40 Figure 6 shows the EEC, which fitted from impedance spectra. The individual elements values of the circuit are shown in Table IV.…”

Review of the Effects of Supplementary Cementitious Materials and Chemical Additives on the Physical, Mechanical and Durability Properties of Hydraulic Concrete

“…Hence, the need for environmentally friendly corrosion inhibitors to prevent corrosion problems in new and existing concrete structures has been studied [ 154 ]. However, a corrosion inhibitor does not stop the corrosion of metal, which prolongs the initiation of corrosion and reduces the rate of corrosion reactions between the metal and aggressive ions [ 155 , 156 ]. The inhibitors are distinguished on the basis of their chemical components, namely as organic and inorganic and (by the presence of a polar group) as anodic, cathodic or mixed (i.e., both positive and negative polar groups) [ 157 ].…”