Effect of three penicillin-based as corrosion inhibitors on Q235 steel in hydrochloric acid

Preparation and corrosion inhibition mechanism of a chitosan ionic liquid Schiff base for the protection of N80 in HCl solution

“…With an increase in the concentration, the corrosion inhibitor molecules gradually form a protective film on the metal surface, which blocks the contact between the metal and corrosive medium and reduces the occurrence of corrosion. 46 Results show that the best corrosion inhibition efficiencies for all the studied systems are achieved at 400 mg L −1 . The corrosion efficiency increases from 57.77% (CS) to the maximum values of 80.76% (CS-IL-Cin), 83.66% (CS-IL-Vin), and 72.04% (CS-IL-4-Py), respectively.…”

Isothiourea-Terminated Pentaerythritol Core Dendrimers as Highly Efficient Corrosion Inhibitors for Carbon Steel in Soft Water

“…The fitted linear regression coefficients ( R 2 ) for PETA/4ITU-0G and PETA/8ITU-1G were 0.9797 and 0.9998, respectively. To explore the type of adsorption of PETA/4ITU-0G and PETA/8ITU-1G on carbon steel, the standard free energy of adsorption (Δ G ads 0 ) was calculated according to eq K ads = 1 55.5 0.25em exp − normalΔ G ads 0 RT where R is the universal gas constant (J·K –1 ·mol –1 ), T is the temperature (K), and 55.5 is the molar concentration (mol –1 ) of water in the solution. The Δ G ads 0 values of PETA/4ITU-0G and PETA/8ITU-1G were 21.35 and −26.42 kJ·mol –1 , respectively, which were between −20 and −40 kJ·mol –1 .…”

“…They can be divided into two categories: natural and synthetic. , Natural inhibitors extracted from plants, proteins, and microorganisms are gaining popularity because of their biodegradability and eco-friendliness . However, they have little practical application in industries due to high-cost production, higher dosage to achieve good corrosion inhibition performance, and being unstable in high temperature and high viscosity . Accordingly, phosphorus-free synthetic inhibitors might be the best choice.…”