| Abstrakt: |
Plate-like heat exchangers commonly use 06KhN28MDT alloy for various acids, which is resistant to localized corrosion but susceptible to crevice corrosion in cooling water. This study assessed the alloy's crevice corrosion resistance in 3% NaCl circulating water using electrochemical methods. Anodic potentiodynamic curves determined Er, Ecor, and Ecrew potentials. Resistance was assessed based on Ecrew potential, simulating a 0.3 mm gap. Ecrew potentials varied: melts 1 and 5 were most positive (1.10 and 1.13V), melts 2 and 3 the most negative (0.58V), due to differences in Cr, Mo, Ti, Cu content. Melts 2 and 3, with excess carbon, had negative Ecrew potentials. No correlation was found between Ecrew and titanium nitride volume, but melt 1 had more than melts 2 and 5. E, the difference between Er and Ecor, produced similar results. Melts 1, 4, and 5 were highly resistant, melts 2 and 3 less so. In conclusion, heat exchanger manufacturers should choose low-C, high-Cr, Mo, Ti, Cu alloy for better crevice corrosion resistance in circulating water. [ABSTRACT FROM AUTHOR] |
