针对某沿海电厂冷油器部分新换BFe30-1-1管(B30白铜管)出现了腐蚀的问题,对B30白铜管现有的几种成膜工艺进行了筛选,对比研究了BTA、MBT、FeSO₄膜层对B30白铜管在自然海水、含Na₂S污染海水及酸化海水中的保护效果。结果表明:铜试剂成膜及氧化成膜工艺不适用于B30白铜管的防腐蚀处理;BTA、MBT膜层在pH 5.3的酸化海水中耐点蚀性能偏低;FeSO₄膜层在自然海水、含Na₂S污染海水及酸化海水中的耐点蚀性能与老管接近,冷油器B30白铜管新管适用FeSO₄成膜工艺。

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.