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| Effects of PO43- on Pitting Nucleation of 304 Stainless Steel in Chloride Solutions |
| SHI Huiying, TANG Yumiung, ZUO Yu |
| School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China |
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Abstract The effects of PO43- on nucleation and growth of metastable and stable pitting were investigated by cycling potentiodynamic polarization. Both metastable pitting potential Em and stable pitting potential Eb increase with the increasing of PO43- concentration. Higher PO43- concentration results in lower average growth rate and peak current of metastable pitting, hence inhibits the nucleation of stable pitting. However, as PO43- concentration increases, the repassivation potential of stable pitting Ep decreases, indicating that the repassivation of the pit is retarded. The reason is explained by the deposition of phosphate film around the pit mouth, which may promote the growth stability of the pit.
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