수돗물 부식성 제어를 통한 수도관 부식방지 : 부식억제제별 효과와 영향에 대한 분석
Corrosion Control in Water Pipes by Adjusting the Corrosivity of Drinking Water : Effect and impact of the Corrosion Inhibitor
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초록
The tap water used in Seoul was found to be corrosive. Its corrosivity was effectively reduced by thatthe additions of alkali agent such as NaOH, Ca(OH)2 and corrosion inhibitor such as H3PO4. For the corrosiontest, carbon steel pipe 50 m long was exposed to the drinking water produced by a pilot plant at 36.5℃, similar to the existing process where it takes about 20 minutes to reduce the initial chlorine contentof 0.5 ㎎/L to 0.05 ㎎/L. CO2 and Ca(OH)2 was added not only to control the Langelier index (LI) above–1.0 and but also, to increase the duration time of residual chlorine by about 6 times. The persistenceeffect of residual chlorine was in the order of H3PO4 > Ca(OH)2 > NaOH. Measurements of weight lossshowed that corrosion inhibition was effective in order of Ca (OH)2 > H3PO4 > NaOH > no addition,where the concentrations of Ca(OH)2 and phosphate were 5 ~ 10 ㎎/L (as Ca2+) and 1 ㎎/L (as PO43-),respectively.
Abstract
The tap water used in Seoul was found to be corrosive. Its corrosivity was effectively reduced by thatthe additions of alkali agent such as NaOH, Ca(OH)2 and corrosion inhibitor such as H3PO4. For the corrosiontest, carbon steel pipe 50 m long was exposed to the drinking water produced by a pilot plant at 36.5℃, similar to the existing process where it takes about 20 minutes to reduce the initial chlorine contentof 0.5 ㎎/L to 0.05 ㎎/L. CO2 and Ca(OH)2 was added not only to control the Langelier index (LI) above–1.0 and but also, to increase the duration time of residual chlorine by about 6 times. The persistenceeffect of residual chlorine was in the order of H3PO4 > Ca(OH)2 > NaOH. Measurements of weight lossshowed that corrosion inhibition was effective in order of Ca (OH)2 > H3PO4 > NaOH > no addition,where the concentrations of Ca(OH)2 and phosphate were 5 ~ 10 ㎎/L (as Ca2+) and 1 ㎎/L (as PO43-),respectively.
참고문헌 (18)
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