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연구논문초록(’81-’90) : 중량감소법에 의한 해수중의 상용금속의 최적음극방식전위의 연구 - (2 ) 해수중의 활동 -
전대희,전중석,강종호 한국부식학회 1991 Corrosion Science and Technology Vol.20 No.1
This study is to verify experimentally the validity of the polarization resistance technique that has been introduced previously. The corrosion-loss measurement for brass in natural seawater was adopted as the experimental method. For brass in natural seawater, the potential of maximum polarization resistance, which appeared at o.35V (vs. SEC) on the cathodic polarization curve, was coincided with the optimum cathodic protection potential which was determined by the corrosion-loss measurement. This potential of maximum polarization resistance corresponds to the potential 0.1 V below the corrosion potential of brass in natural seawater. This experimental result supports the aurhor's technique that the optmum cathodic protection potential coincides with the potentiae of the maximum poarization resistance of metal. This optimum cathodic protection potential for brass in natural seawater is in very good agreement with the cathodie protection potential that was recommended by NACE Standard, Federal Register and Shigeno. But it is not in good agreement with the protection potentials that were recommended by Schwerdtfeger, Nagakawa, Crennel, and England Standard of Copper alloys. The tatters are considered as the cathodic protection potentials for special copper alloys.
전대희,김기준,이상태 한국마린엔지니어링학회 1983 한국마린엔지니어링학회지 Vol.7 No.2
Preparing for treatment and management of the emulsified fuel oil which will be generalized henceforth, this paper is an attempt to examine the viscosity-temperature characteristics of emulsified heavy fuel oil which is mixed with water and emulsifier in various mixture ratio by mechanical mixer. The experimental results are summarized as follows: 1. The viscosity-temperature characteristics of the emulsified C & B grade heavy fuel oil mixed with water of same or less weight, is changed according to log.log(v+0.6)=b-3.8log T. 2. The emulsifier has to be added to the emulsified A grade heavy fuel oil mixed with water of same or less weight, because it is instable. Especially if the emulsifier is sodium stearate, it is added more than 0.3% of the weight of oil and water. 3. In the emulsified A grade heavy fuel oil mixed with water and emulsifier, the higher the ratio of water addition becomes, the higher the viscosity is and the more the viscosity-temperature slope decreases. But the higher the ratio of emulsifier addition is, the more the viscosity-temperature slope increases. In this case, the linearity of viscosity-temperature characteristic curve is poorer than that of B and C grade heavy fuel oil. 4. In the emulsified A grade heavy fuel oil mixed with emulsifier of 0.3% or less, the emulsion type is O/W type when water addition ratio is 40%, but it is W/O type when it is 10%, 20%, 30% and 50%.