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Evaluation of the Corrosion Resistance of Zn-Coated Steel as a Function of the Temperature of the Cr-free Solution Used to Coat the Steel  

Seo, Hyun-Soo (Defence Agency for Technology and Quality)
Moon, Hee-Joon (Graduate School, Pukyong National University)
Kim, Jong-Soon (NGE Tech Ltd.)
Ahn, Seok-Hwan (Bukyong Education Center for Vehicle Safety Component Technology, Pukyong National University)
Moon, Chang-Kwon (Materials Science and Engineering, Pukyong National University)
Nam, Ki-Woo (Materials Science and Engineering, Pukyong National University)
Publication Information
Journal of Ocean Engineering and Technology / v.24, no.5, 2010 , pp. 60-66 More about this Journal
Abstract
Zinc has a number of characteristics that make it well suited for use as a coating to protecting iron and steel products from corrosion. Its excellent corrosion resistance in most environments accounts for its successful use as a protective coating on a variety of products and in many exposure conditions. The excellent field performance of zinc coatings results from their ability to form dense, adherent films that corrode at a rate that ranges from 1% to 10% of the corrosion rate of ferrous materials, depending on the environment. Recently, EU RoHS and EU ELV prohibited the use of materials that adversely affect the environment, such as Pb, Hg, Cd, and $Cr^{+6}$. In this study, environmentally-friendly, Cr-free solutions (epoxy solution, acrylic solution, and urethane solution S-700) and organic/inorganic solution with Si; LRO-317) were used to evaluate the corrosion resistance of zinc-coated steel subjected to a saltwater spray for 72 hours. The coating of urethane solution (S-700) was best among the three kinds of solution with heat treatment during five minutes at $190^{\circ}F$. Test specimens with S-700 and LRO-317 coating were heat treated in a drying oven at 170, 180, 190, 200, and $210^{\circ}C$ for five minutes. The results show that the optimum corrosion resistance was $190^{\circ}C$ in EGI and $170^{\circ}C$ in HDGI, respectively.
Keywords
Heat treatment temperature; Organic/inorganic hybrid; Electrolytic Galvanized; Hot-dip Galvanized; Salt spray test; Coating solution; White rust;
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Times Cited By KSCI : 5  (Citation Analysis)
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