Inhibition of pitting corrosion of C-steel in oilfield-produced water using some purine derivatives

Retardation of the C-Steel Destruction in Hydrochloric Acid Media Utilizing an Effective Schiff Base Inhibitor: Experimental and Theoretical Computations

“…The computed values of Δ H* are listed in Table and have a positive sign that explains the endothermic nature of the transition state accompanied by the corrosion inhibition process. , The values of −Δ S* can be computed from the y -axis intercept of Figure and computed to be 26.70 J mol –1 K –1 with dilute hydrochloric acid solution and vary from 51.2 to 83.9 J mol –1 K –1 with various amounts of the DMAB inhibitor, Table . The increase in the negativity of Δ S* with more additions of the DMAB inhibitor would indicate that the activated complex in the rate-determining process represents an association rather than dissociation. − , …”

Expired Antifungal Drugs as Effective Corrosion Inhibitors for Carbon Steel in 1 M HCl Solution: Practical and Theoretical Approaches

“…The plots between E pitting and the logarithm of the concentrations of expired BIF and TER are presented in Figure 7. Straight lines were obtained, and with higher concentrations of expired BIF and TER, the E pitting values showed a positive trend according to the following relationship 23,48 = + E C log pitting ex drugs (10) where ∂ and ∝ are constants that depend on the type of the working electrode and inhibitors used (the units of ∂ is mV and the unit of α is mV/(mg L)). These results demonstrate that the expired BIF and TER served as inhibitors of X65CS pitting corrosion.…”

“…Corrosion inhibitors minimize the corrosion rate of steel in aqueous solution and prevent carbon steel from dissolving in acidic medium. Most inhibitors are organic molecules with several active centers that accelerate the adsorption process. − The primary mechanism for the inhibitory action of the organic molecules on the steel surface is physical or chemical adsorption. The formation of an adsorbent film isolates the steel surface from the aggressive medium. − The inhibition strength of the organic inhibitors depend on several factors such as the electrode surface employed, the nature of aggressive solutions, the chemical composition of the additives, the physicochemical properties of the molecule with respect to the functional group, the expected steric and electronic effect of the density of donor atoms, and the possible interaction between the inhibitors with the d orbital of the iron atoms. − …”

“…Most inhibitors are organic molecules with several active centers that accelerate the adsorption process. 7 − 1 The primary mechanism for the inhibitory action of the organic molecules on the steel surface is physical or chemical adsorption. The formation of an adsorbent film isolates the steel surface from the aggressive medium.…”

Corrosion Inhibitive Action of Hesperidin methyl chalcone (HMC) on Aluminum in H2SO4

“…The presence of a passive layer made of double-nature oxide film on the surface of aluminum provides corrosion resistance in an aqueous neutral solution. Numerous attempts have been undertaken by scientists to investigate the impact of aggressive anions, such as sulfate and chloride, on the stability of the passive oxide layer created in aqueous solutions on metals (Abd El Haleem and Abd El Wanees 2018;Al-Gorair et al 2021;Abd El Wanees et al 2022).…”