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지하 매설 구조물의 부식과 방식 : 7. 외부전원에 의한 음극방식 (1) 7. Cathodic Protection by Impressed Current (1)
고영태 한국부식학회 1998 Corrosion Science and Technology Vol.27 No.5
Cathodic protection utilizing impressed current(IC) is reviewed. Most of large-scale metallic structures need corrosion protection are protected by IC due to its reliability and efficiency compared to sacrificial anode protection. It is particularly suitable for structures which requires a considerable amount of protection current. Uniform distribution of current, therefore, becomes essential in IC method in order to avoid problems like under- or over-protection and interference. It is an appropriate selection and installation of anode and power supply unit that determines the reliability of IC system. Details on various types and shapes of IC anodes are described emphasizing those for underground application. The effects of backfill on current output and anode consumption are also described.
고영태,신윤석,이명도 대한건축학회지회연합회 2020 대한건축학회연합논문집 Vol.22 No.5
This study proposes additional items to be identified as defects in a defect lawsuit through a case study of defect lawsuits in apartment housing. In this study, the defects that were not initially discovered by existing occupants and construction companies, but were newly discovered in litigation, were defined as defects in lawsuits. The defects in lawsuits lead to an unexpected increase in litigation cost, delays in the date of litigation, and emotion repercussions or additional litigation, which may cause a vicious cycle. Therefore, identifying new defects during the course of litigation is necessary. In this study, the concept of defects in apartment housing and the criteria to judge these defects to preliminary considerations were analyzed. The concept of defects in defect lawsuits was defined, in addition to a case analysis of six domestic defect lawsuits. The results yielded 29 defect items, which were validated by appraisers who directly appraised the cases. In addition, the derived defect factors were analyzed. Finally, 29 defect items for defect lawsuits were categorized into 11 main factors. Deriving defects for defect lawsuits would mean establishment of a new area of defects that are not currently considered in practice. This would provide an overall area of defects to be considered in addition to existing defect items in the course of litigation. The results of this study can help reduce the actual occurrence of defects and minimize disputes in the case of defect lawsuits.
고영태,박경완 한국부식학회 1994 Corrosion Science and Technology Vol.23 No.1
Various polarization resistance measurement methods are summarized. These include potentiostatic, galvanostatic, potentiodynamic, AC impedance and cyclic polarization methods. Corrosion rate is measured by obtaining polarization resistance value through steady state response of corroding system upon predetermined applied signal All of above mentioned methods are steady state ones where reliable measurement is feasible only when steady state is reached. Problems associated with increased measuring time as a result of decreasing corrosion rate and/or increasing electrolyte resistance is analyzed for each method. Need for investigation on new method based on transient behavior, reducing measurement time thereafter, is proposed as a conclusion.