Strength and Chloride Resistance of Underground Buried Steel Pipe Coated with Albizia Ferruginea Exudates

This study investigates the effectiveness of Albizia ferruginea exudates as a protective coating for underground buried steel pipelines, focusing on its corrosion resistance and mechanical properties. The results indicate that the application of these natural coatings significantly enhances the structural integrity of steel while providing effective corrosion protection. Coated samples showed a corrosion potential (Ecorr) ranging from -600 mV to -500 mV versus the saturated calomel electrode (SCE), in contrast to uncoated samples, which displayed values between -450 mV and -400 mV. Furthermore, the corrosion current density (Icorr) for coated samples ranged from 0.01 to 0.05 μA/cm², while uncoated samples exhibited values between 0.1 and 0.5 μA/cm². Mechanical properties also improved significantly: tensile strength for coated samples was between 450 and 500 MPa compared to 350 to 400 MPa for uncoated samples, and yield strength ranged from 250 to 300 MPa for coated samples versus 200 to 225 MPa for uncoated samples. These findings confirm that Albizia ferruginea exudates not only act as effective corrosion inhibitors but also enhance the mechanical performance of steel under stress.