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논문 : 표면처리 ; 아연-철 합금도금강판의 인산염처리성에 미치는 Cu-Flash처리의 영향
조용균 ( Yong Kyun Cho ),김영근 ( Young Geun Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.7
Bus makers have applied Zn-Fe coated steel sheet to bus outer bodies because of its high corrosion resistance. But it was difficult for the makers to phosphate the bus bodies by themselves because the size of bus body was too big to immerse it in phosphating bath. Therefore. the bus makers have required steel makers to provide Zn-Fe coated steel sheet that was phosphated directly in EGL(Electro-Galvanizing Line). But it was also found to be difficult that Zn-Fe electroplated steel sheet was phosphated in the high speed continuous EGL. because the phosphating time in the process was too short to complete the phosphating reaction. It was observed on this process that the Zn-Fe coated steel sheet could be phosphated perfectly even in as short reaction time-about 3~7 seconds-as EGL by precipitating copper on it before phosphating. Precipitating copper on Zn-Fe coated steel sheet was carried out by dipping the steel sheet for 3~7 seconds in copper solution of about 0.5~1.0g/l concentration. This method. reducing phosphating time by precipitating copper on Zn-Fe coated steel sheet before phosphating was named as Cu-Dash treatment.
황산욕에서 철 불순물이 아연도금강판의 표면품질에 미치는 영향
조용균,김영근 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.8
In continuous electroplating of steel strip using sulfate bath, the bath can be easily contaminated by ferrous ions dissolved from steel strip due to it low pH. When the phosphate conversion coating was applied subsequently on the electro-galvanized coating layer, which was plated from the contaminated bath, the surface defect called black mark could be formed on the phosphate surface. The formation of black mark on the phosphate surface seemed to be arisen from the uneven co-deposition of iron into the electro-galvanized layer, which would render non-uniform coating weight distribution of the phosphate layer. Because only the uppermost layer of the electro-galvanized coating affects the coating weight of the phosphate layer, it could be possible to prevent the formation of black mark if the ordinary high current density plating is followed by the final low current density plating, which would give uniform and low iron content in the electro-galvanized coating layer.
레이디얼형 전기도금조에서 에지 과도금 방지를 위한 적정 에지마스크에 관한 연구
김형민,김영근,조용균 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.3
Investigations were made to develop a new type of edge mask to give an adequate answer to the strip edge over-coating problem in electroplating process. Because of its inherent nature of the strip edge on which the electric field or current flux tends to be concentrated, many problems were caused, such as edge over-coating, powdering, burning and zinc tree. The conventional therapy for these problems adopted so far is, for example, like bringing either the current density or the coating weight lower. But with such a declining Control, the productivity was doomed to be lowered nor any appropriate answer was suggested for edge over-coating problem. Thus, a new type of edge mask and its optimal conditions are suggested in this paper. It was concluded that the edge mask should be positioned in between -1 to +1 ㎜ from the strip edge and kept from contacting with the strip surface. A new type edge mask satisfying fore-mentioned conditions and being compatible with the shape of electroplating cell was sketched as well.