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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 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.
현영민 ( Young Min Hyun ),김희산 ( Hee San Kim ),김영호 ( Young Ho Kim ),장현정 ( Hyun Jung Jang ),박영복 ( Young Bog Park ),최영준 ( Young June Choi ) 한국부식방식학회 2012 Corrosion Science and Technology Vol.11 No.2
Factors affecting corrosion of stainless steels such as pH, oxidation and redox potential (ORP), soil resistivity, water content of soil, chloride ion concentration, bacteria activity, and corrosion potential have been investigated using soil analysis, bacterial analysis, surfacial analysis, and analysis of corrosion potentials of several stainless steels buried in 8 sites of Seoul metropolitan for one year. Corrosion potential was affected by occurrance of corrosion as well as bacteria activity but the behavior of corrosion potential with time is different depending on occurrance of corrosion and bacteria activity. The main factor affecting corrosion of stainless steels in soil is level of chloride ion concentration which is also a main factor affecting corrosion of stainless steels in chloride containing drinkable water, Furthermore, guideline of stainless steels in drinkable water is concluded to be applicable to that in soil by the results from surfacial analysis.
윤소남(So-Nam Yun),함영복(Young-Bog Ham),박평원(Pyoung-Won Park),안병규(Byoung-Kyu Ahn),김고도(Go-Do Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
In the common rail system with direct injection equipment in diesel engine, low pressure fuel control valve(proportional metering valve) to control the fuel flow into the high pressure pump is used. The proportional solenoid actuator is suitable for metering valve because it has a constant attraction force in the control region independently on the stroke position and a fast motion response of the plunger. The force characteristics with respect to the stroke of the proportional solenoid actuator are strongly depending on the shape of the control cone. but it is difficult to design the control cone. ]n this paper. a proportional solenoid actuator of electrohydraulic proportional metering valve for common rail system was analyzed using finite element method and the shape of the control cone of the proportional solenoid actuator was optimized to get the constant force in the control region. The analysis results of the optimized proportional solenoid actuator were compared with the experimental results of the manufactured one.
윤소남(Sonam Yun),함영복(Young-Bog Ham),박평원(Pyung-Won Park),조정현(Jeong-Hyun Jo),김고도(Go-Do Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
In the common rail system, fuel control for high pressure injection is very important and actuator for high frquency fuel control is needed. In this paper, low pressure proportional solenoid actuator which is used for fuel control of common rail system of diesel vehicle was studied. this study performed finite element analysis of a constant force solenoid for diesel fuel control. Based on these analyses, an optimized solenoid actuator model for diesel fuel control was suggested and manufactured. Also, the performance of this model was evaluated through the experiments.