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남기우(K.W. Nam),문희준(H.J. Moon),박상현(S.H. Park),김은선(E.S. Kim),서현수(H.S. Seo),김종순(J.S. Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Zinc coatings are widely used in practice for preventing the corrosion of steel. But the zinc coating can be involved by corrosion phenomena with the consequence that some steel surface is unprotected. The reduction of the corrosion rate of zinc is an important topic. In the past a very popular way to reduce the corrosion rate of zinc was the use of chemical conversion layers based on Cr??. However, there is the important problem that the use of chromium salts is now restricted because of environmental protection legislation. Therefore very important to develop new zinc surface treatments environmentally friendly to improve the corrosion resistance of zinc and the adhesion with the final organic protective layer. In this study, Urethane solution (only Urethane 20 % ; S-700) and organic/inorganic solution with Si (Si polysilicate 10 % + Urethane 6 % + hardner 4 % ; LRO317-1)are used. Based on the salt spray test of 72h, S-700 and LRO317-1 had a superior effect on EGI and HGI, respectively.