Carbon dots have attracted wide interest in corrosion fields due to their superior corrosion inhibition performance, low toxicity and tunable surface functionality. In this work, novel N-doped carbon dots (N-CDs) with dual functionalities—corrosion inhibition and corrosion warning were synthesized via a hydrothermal route and applied to protect carbon steel in strong acid environments. The corrosion inhibition performance of the N-CDs was systematically evaluated using electrochemical measurements, weight loss tests, and surface characterization techniques. Among the synthesized samples, N-CDs derived from L-phenylalanine and L-tryptophan (1:1 molar ratio) exhibited outstanding corrosion inhibition to carbon steel in 1M HCl solution, achieving higher corrosion inhibition efficiency of 96.04% at a concentration of 200 ppm in 1M HCl solution. Mechanistic studies revealed that the inhibition process involved both physisorption and chemisorption, conforming to the Langmuir adsorption isotherm. Moreover, the N-CDs displayed pronounced fluorescence quenching toward Fe³⁺ ions, enabling early-stage detection of corrosion onset. This study presents a multifunctional carbon-based nanomaterial that integrates high-performance corrosion protection with real-time corrosion monitoring, offering new prospects for advanced corrosion control in harsh environments.
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