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조선용 프라이머 코팅강판의 CO₂ 레이저 용접에 있어서 프라이머 코팅 조건과 갭(Gap) 간극의 영향
김종도(Jong-Do Kim),길병래(Byung-Lea Kil),장지연(Ji-Yon Jang) 한국해양대학교 해사산업연구소 2005 海事産業硏究所論文集 Vol.16 No.-
The spatter and porosity could be occurred during CO₂ CW laser welding of Primer-coated steel for shipbuilding. This study has suggested an alternative idea by examining of weld-defect formation mechanism. The primer-coated plate induced the spatter, humping bead and porosity and these are main part of the welding defect, attributed to the powerful vaporizing pressure of primer attached on the base metal. The zinc of primer has a boiling point that is the lower temperature than melting point of steel. Zinc vapor will build up at the interface between the two sheets and this tends to deteriorate the quality of the weld by ejecting weld material from lap position or leaving porosity. Therefore introducing a small gap clearance in the lap position, the zinc vapor could escape through it and sound weld beads can be acquired. In conclusion, we suggested the occurred and prevented mechanism of weld defects with searching the factor.
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무전해 Ni-P 도금막의 형성과 Turn over에 따른 막의 특성비교
이영호(Yeong-Ho Lee),윤용섭(Yong-Sub Yun),장지연(Ji-Yon Jang),문경만(Kyung-Man Moon),이명훈(Myeong-Hoon Lee) 한국해양대학교 해사산업연구소 2002 海事産業硏究所論文集 Vol.12 No.-
Electroless Nickel(EN) plating method among the surface modification techniques is today one of the most fastly growing sectors in the material surface finishing industry. EN plating, in general, provides high precision functional coatings for industrial applications requiring; corrosion protection, high hardness, uniform thickness, less porosity, increased lubricity and wear resistance, etc. During EN plating, however, by-products of the chemical reaction, including orthophosphite, sodium sulfate, and ammonia, build up and decrease bath performance. As the concentrations of by-products increase, the nickel deposition rate decreases. In addition, the nickel plating becomes more porous and intrinsic-stressed, and its appearance becomes less lustrous. Physical properties such as magnetics and solderability may also be adversely affected. With the increase of metal turn over, the deposition rate, hardness and bath performance in the electro less plating are decreased, however, the corrosion behaviors of the electroless plated Ni-P films showed nearly low corrosion tendency. And the film morphology became from columnar to granular structure and the surface grain size decrease with the increase of metal turn over. On the other hand, the phosphorous content of electroless plated Ni-P films becomes increase, and the films tend to show more porous. Eventually, the properties comparison of the electroless plated Ni-P films can be explained by analyzing the content ratio of nickel and phosphorous, the grain size of surface, the morphology of cross section in the plated film in relation with metal turn over.
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