臭氧对中温循环冷却水系统的缓蚀性能研究

循环冷却水系统中普遍存在结垢腐蚀现象,目前常用的解决方法是在系统中加入缓蚀阻垢药剂,臭氧(O3)对循环水冷却系统同时具备阻垢、缓蚀、杀菌等多重功能。采用臭氧处理中温循环冷却水,研究在不同臭氧投加量时系统的腐蚀情况,确定最佳投加量。结果表明:当臭氧投加量为4.5 mg/L时,20碳钢和铸铁的缓蚀能力最佳。20碳钢腐蚀率最低为0.228 mm/a,比空白对照组降低了75%;铸铁的最低腐蚀率为0.282 mm/a,比空白对照组降低了61.5%。当臭氧投加量为9.0 mg/L时,镀锌试片的腐蚀率在0.206~0.275 mm/a,比空白对照组降低了38.2%左右,缓蚀效果较为明显。

CORROSION BEHAVIORS OF OZONE IN WARM-WATER CIRCULATION SYSTEM

The scaling and corrosion is a common phenomenon in the circulating cooling water system． The method to solve the issue is to add the scaling and corrosion inhibitor． Ozone ( O3 ) processing method can achieve corrosion and scale inhibitor、 disinfection and other multi-function． The paper discussed ozone processing used in warm-water circulation system，and studied the scale and corrosion situation under different quantity of ozone to determine the optimal dosing quantity． The result showed that: When ozone optimum dosage was 4. 5 mg /L，20 carbon steel and cast iron had the best corrosion ability． The lowest corrosion rate of 20 carbon steel was 0. 228 mm/a，reducing 75% compared with the blank test; the cast iron was 0. 282 mm/a，reducing 61. 5% compared with the blank control group． When ozone dosing quantity was 9. 0 mg /L，the corrosion rate of galvanized was 0. 206 to 0. 275 mm/a，going down of 38. 2% compared with the blank control group． The corrosion effect was obvious．