Cr-free 코팅액에 의한 아연도금강판의 열처리 온도에 따른 내식특성

• Published in: Han-guk haeyang gonghak hoeji (Online) Vol. 24; no. 5; pp. 60 - 66
• Main Authors: 서현수(Hyun-Soo Seo), 문희준(Hee-Joon Moon), 김종순(Jong-Soon Kim), 안석환(Seok-Hwan Ahn), 문창권(Chang-Kwon Moon), 남기우(Ki-Woo Nam)
• Format: Journal Article
• Language: Korean
• Published: 한국해양공학회 2010
• Subjects: 해양공학; Electrolytic Galvanized 전기아연도금; Organic/inorganic hybrid 유/무기 하이브리드; Coating solution 코팅액; White rust 백청; Hot-dip Galvanized 용융이연도금; Heat treatment temperature 열처리 온도; Salt spray test 염수분무시험; /
• ISSN: 1225-0767; 2287-6715

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.