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수돗물 부식성 제어를 통한 수도관 부식방지 : 부식억제제별 효과와 영향에 대한 분석
박영복 ( Young-bog Park ),박주현 ( Ju-hyun Park ),박은희 ( Eun-hee Park ),이진숙 ( Jin-suk Lee ),김현돈 ( Hyen-ton Kim ),최영준 ( Young-june Choi ),정현미 ( Hyen-mi Chung ),허유정 ( Yu-jeong Huh ),최인철 ( In-cheol Choi ) 한국부식방식학회(구 한국부식학회) 2016 Corrosion Science and Technology Vol.15 No.6
The tap water used in Seoul was found to be corrosive. Its corrosivity was effectively reduced by that the additions of alkali agent such as NaOH, Ca(OH)<sub>2</sub> and corrosion inhibitor such as H<sub>3</sub>PO<sub>4</sub>. For the corrosion test, 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 content of 0.5 ㎎/L to 0.05 ㎎/L. CO<sub>2</sub> and Ca(OH)<sub>2</sub> 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 persistence effect of residual chlorine was in the order of H<sub>3</sub>PO<sub>4</sub> > Ca(OH)<sub>2</sub> > NaOH. Measurements of weight loss showed that corrosion inhibition was effective in order of Ca (OH)<sub>2</sub> > H<sub>3</sub>PO<sub>4</sub> > NaOH > no addition, where the concentrations of Ca(OH)<sub>2</sub> and phosphate were 5 ~ 10 ㎎/L (as Ca<sup>2+</sup>) and 1 ㎎/L (as PO<sub>4</sub><sup>3-</sup>), respectively.