접지전지 설계를 위한 Zn, Al 및 Mg의 합급양극의 특성을 실험적으로 조사한 결과를 다음과 같이 요약할 수 있다. 1. 환경비저항 1000 Ω.cm 이하에서는 Zn합금양극이, 1000 Ω.cm 이상에서는 Mg합금양극이 접지전지 설계에 좋다. 2. 비저항 500 Ω.cm 이하에서는 Al합금양극이 Mg 합금양극보다 접지전지 설계를 위한 유전양극 특성이 좋으나 모든 비저항에서 Zn합금양극보다 특성이 떨어진다. 3. 배유전유밀도가 급격히 증가하는 일정인가전압은 다음과 같다. ① E 하(Zn)=log (4.9465/σ상(0.0639))+11×10 상(-6)σ상(0.8923i) ② E 하(Al)=log (4.9306/σ상(0.0525))+13×10 상(-6)σ상(0.9314i) ˚led3 E 하(Mg)= log (3.7086/σ상(0.0988))+181×10 상(-6)σ상(0.5406i) 4. 유전양극의 종류 및 환경의 비저항에 따라 인가전압과 배유전유밀도의 관계는 다음과 같은 일반식으로 표시할 수 있다. logi=g+root(n.E+r)

The galvanic anodes have three kinds of Zn alloy anode, Al alloy anode and Mg alloy anode, which are widely used in cathodic protection for all metal structures in water or under ground. This paper to be used for designing of the grounding cell has reached the following conclusion as the results of an experimental study on the characteristics of such galvanic anodes for corrosion protection of pipings: 1) Zn alloy anode was the best when the specific resistance of the environment was bellow 1000 Ω.cm, and when above 1000 Ω.cm, Mg alloy anode to be used for designing of the grounding cell was the best. 2) Al alloy anode was better than Mg alloy anode for grounding cell when the specific resistance was bellow 500 Ω.cm, but the Al alloy anode in all the environments reduced the characteristics of galvanic anode to the lower grade than those of Zn alloy anode. 3) Each impressed voltage (E) of the anodes at which drainage current density (σ) begins rapidly increasing is quantitatively presented as follows: ① E sub(Zn)=log (4.9465/σsuper(0.0639))+11×10 super(-6)σsuper(0.8923i) ② E sub(Al)=log (4.9306/σsuper(0.0525))+13×10 super(-6)σsuper(0.9314i) ˚led3 E sub(Mg)= log (3.7086/σsuper(0.0988))+181×10 super(-6)σsuper(0.5406i) 4) The empirical equations between the drainage current density (i) and impressed environment are modeled as the following type. logi=g+root(n.E+r)(g,n,r; constants)

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