Corrosion Inhibition and Rust Conversion of Catechin on Archaeological Iron of Nanhai I

This work took the iron objects from Nanhai No. 1 shipwreck in Southern Song Dynasty of China as sample to test and analyze application potential catechin, an environmentally friendly corrosion inhibitor rust converter. The article used metallographic microscopy clarify that structure artifact was hypereutectic white iron. By means micro-Raman, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM), potentiodynamic polarization electrochemical impedance spectroscopy, catechin had ability react with oxyhydroxides such goethite, akaganeite lepidocrocite rust, forming amorphous substance a marked signal about 1380 cm−1 phenolic-Fe properties. new products could make original layer form laminated dense structure. After archaeological soaked 3.0 g/L current density decreased by 37.13% shifted positively 32.67 mV. anode reaction more inhibited than cathode curve. resistance increased 3.75 times ion diffusion 6.33 times. inhibition efficiency 21.75% conversion 73.26%. 36 h accelerated corrosion, protection effect newly transformed still better state. Catechin mild material which showed satisfactory performance for has good prospect.