摘要
目的针对供热管网软化水水质,研究在供热软化水中除氧剂乙醛肟和异抗坏血酸钠的除氧性能,以及添加除氧剂乙醛肟和异抗坏血酸钠、调节p H值对碳钢腐蚀率的影响。方法通过除氧实验、静态挂片和旋转挂片实验,研究除氧剂乙醛肟和异抗坏血酸钠的除氧性能以及添加除氧剂对碳钢腐蚀率的影响,用1 mol/L的氢氧化钠和碳酸钠溶液调节p H值对碳钢腐蚀率的影响,以及添加除氧剂后在p H=11时对碳钢腐蚀率的影响。结果在乙醛肟和异抗坏血酸钠的质量浓度为160 mg/L时,除氧率分别为45.68%和71.83%,碳钢的腐蚀率分别为0.1948,0.0728 mm/a;用氢氧化钠和碳酸钠调节p H值为11时,碳钢的腐蚀率分别为0.0751,0.0143 mm/a;在乙醛肟和异抗坏血酸钠的质量浓度为120 mg/L,p H=11时,碳钢的腐蚀率分别为0.0885,0.0365 mm/a;在乙醛肟的质量浓度为140 mg/L,p H=11时,碳钢的腐蚀率达到0.1531 mm/a。结论异抗坏血酸钠的除氧效果优于乙醛肟的除氧效果,碳钢的腐蚀率随着异抗坏血酸钠浓度的增加而降低,在乙醛肟浓度大于120 mg/L时,碳钢的腐蚀率随着投加量的增加出现先增大后减小的趋势;随着p H值的增大,碳钢的腐蚀率在降低。
Objective To research the deoxidization capacity of deoxidants acetaldoxime and sodium hexametaphosphate in sof- tened water and the effect of sodium hexametaphosphate and acetaldoxime and pH value on the corrosion inhibiting capacity of carbon steel targeting at the quality of heating softened water. Methods The deoxidizing test, the static coupon test and the rotary coupon test were used to investigate the effects on corrosion rate of sodium hexametaphosphate and acetaldoxime, adjusting pH value with sodium hydroxide and sodium carbonate and adjusting pH = 11 after deoxidization for carbon steel. Results Under the condition of doses of 160 mg/L acetaldoxime and sodium hexametaphosphate, the deoxidization rate was 45.68% and 71.83% , the corrosion rate was 0. 1948 mm/a and 0. 0728 mm/a. The corrosion rate was 0.0751 mm/a and 0.0143 mm/a with sodium hydroxide and so- dium carbonate adjusting pH to 11. And under the condition of pH = 11 adjusted by doses of 120 mg/L acetaldoxime and sodium hexametaphosphate, the corrosion rate was 0. 0885 mm/a and 0. 0365 mm/a, while the corrosion rate was 0. 1531 mm/a at a dose of 140 mg/L acetaldoxime, pH = 11. Conclusion The deoxygenation rate by sodium hexametaphosphate was better than by acetaldoxime, the corrosion rate of carbon steel decreased with addition of sodium hexametaphosphate, fluctuated with addition of acetal- doxime when acetaldoxime was more than 120 mg/L, and decreased with the increasing of pH value.
出处
《表面技术》
EI
CAS
CSCD
北大核心
2015年第7期108-113,共6页
Surface Technology
关键词
软化水
PH值
碳钢
腐蚀
异抗坏血酸钠
乙醛肟
除氧
softened water
pH value
carbon steel
corrosion
sodium hexametaphosphate
acetaldoxime
deoxidization
