• Title/Summary/Keyword: Saltwater Spray

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A Study on Surface Corrosion of Compressed Chip of Al-lithium Alloy according to the Packing Method (포장방법에 따른 Al-Li합금 압축칩 표면부식에 관한 연구)

  • Lee, In-Su;Kim, Hae-Ji;Kim, Deok-Hyun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.5
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    • pp.137-141
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    • 2012
  • In order to increase recyclability of new material, aluminium-lithium alloy(Al2050-T84), the chip is compressed in the type of cylinder after machining. This study is to review the effect of environmental condition such as temperature change and salt during the transportation by sea on the corrosion at the surface and inside of the compressed chip, and an effective packing method is presented in this paper.

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 (Cr-free 코팅액에 의한 아연도금강판의 열처리 온도에 따른 내식특성)

  • Seo, Hyun-Soo;Moon, Hee-Joon;Kim, Jong-Soon;Ahn, Seok-Hwan;Moon, Chang-Kwon;Nam, Ki-Woo
    • Journal of Ocean Engineering and Technology
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    • v.24 no.5
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    • pp.60-66
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    • 2010
  • 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.