Abstract
In present study, novel nitrogen doped carbon dots (NCDs) are synthesized using a green material—dopamine—as a precursor and studied as corrosion inhibitors for Q235 carbon steel in 1 M HCl solution. According to the electrochemical results, it is found that NCDs acting as a mixed-type corrosion inhibitor can effectively retard the acid corrosion of carbon steel, and their inhibition efficiency increases with the concentration increasing from 50 to 400 ppm. The highest inhibition efficiency is 96.1% in the presence of 400 ppm NCDs at room temperature. Additionally, the adsorption of NCDs obeys the Langmuir adsorption isotherm. In addition, weight loss results show that the inhibition efficiency in the presence of 400 ppm NCDs increases with prolonged exposure time and rising temperature (298–328 K), owing to the strong adsorption of NCDs on the steel surface, and the η value is 92.2% at 60 h of immersion and 86.2%, 89.1%, 90.6% and 92.9% at 298, 308, 318 and 328 K, respectively. Surface analysis by scanning electron microscope (SEM), laser scanning confocal microscope (LSCM) and X-ray photoelectron spectroscopy (XPS) further proves the formation of a protective NCD film on the steel surface.
Highlights
The carbon steel extensively used in various industries is susceptible to severe corrosion in aggressive environments, especially in an acid medium
We found that nitrogen-doped carbon dots (NCDs) prepared through a hydrothermal process of 4-aminosalicylic acid could effectively retard the acid corrosion of carbon steel at room temperature, and the inhibition efficiency was up to 91% in the presence of 10 ppm nitrogen doped carbon dots (NCDs) [18]
NCDs acting as a mixed-type corrosion inhibitor could effectively inhibit the acid corrosion tion, exposure time and temperature
Summary
The carbon steel extensively used in various industries is susceptible to severe corrosion in aggressive environments, especially in an acid medium. Owing to the difference in the source materials, the corrosion inhibition ability of carbon dots is different Another important thing is that the source materials used in these investigations are still toxic, and most of the investigations only focused on the effect of NCD concentration on the corrosive behavior of metals in acid solution, but ignored the inhibition effect of NCDs under various exposure times and rising temperatures. In this investigation, a natural nontoxic material, dopamine—2-(3,4-dihydroxyphenyl). Surface analysis obtained from the SEM and XPS results provided clear evidence for the adsorption of NCDs against the acid corrosion of carbon steel
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