<p>Corrosion of steel rebar has detrimental effects on reinforced concrete (RC) structures, impacting both the structural integrity and longevity. The application of a coating on steel rebar is a cost-effective method to extend the lifespan of RC structures. Quartz sand modified enamel (QSME) coating demonstrates enhanced bond strength of steel bars in RC structures. In this work, the long-term corrosion behavior of ribbed and plain steel bars coated with QSME is studied in a simulated concrete pore solution with various electrochemical techniques. The microstructure, phase composition, and thermal expansion of the coatings were characterized using scanning electron microscopy, x-ray diffraction, and thermal analysis, respectively. Results show that the QSME coating thickness varies depending on the bar type and quartz sand size. The QSME coating significantly enhances the corrosion resistance of steel bars. Among QSME-coated plain bars with large quartz sand particles, specimens with 10% quartz sand exhibit the highest corrosion resistance, whereas those with 30% quartz sand show the lowest resistance. For plain bars with smaller quartz sand, the corrosion resistance decreases with increasing sand content. Additionally, the corrosion resistance of QSME-coated ribbed bars is lower than that of plain bars, primarily due to the existence of ribs and longitudinal ridges.</p>