Screening of Film Forming Process for BFe30-1-1 Tube of Oil Cooler in Thermal Power Plant

Aiming at the corrosion of new BFe30-1-1(B30 cupronickel) tubes of oil cooler in a coastal power plant, the existing film forming processes of B30 cupronickel tube were screened. The protective effects of BTA, MBT and FeSO₄ coatings on B30 cupronickel tubes in natural seawater, polluted seawater containing Na₂S and acidified seawater were studied. The results show that cupric reagent and oxidation film forming processes were not suitable for anti-corrosion treatment of B30 cupronickel tubes. The pitting corrosion resistance of BTA and MBT films was low in acidified seawater with pH of 5.3. The pitting corrosion resistance of FeSO₄ film in natural seawater, polluted seawater containing Na₂S and acidified seawater was similar to that of the old tubes. So the FeSO₄ film forming process was suitable for new B30 cupronickel tubes of oil cooler.