Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Improving the Corrosion Resistance of Cold-Rolled Carbon Steel by Treatment with a Hybrid Organic/Inorganic Coating Solution

유/무기 하이브리드 코팅액에 의한 냉간압연강판의 내식특성

  • Kim, Jung-Ryang (Graduate School of UR Interdisciplinary program of Mechanical Engineering, Pukyong Nat'l Univ.) ;
  • Choi, Chang-Min (Graduate School of UR Interdisciplinary program of Mechanical Engineering, Pukyong Nat'l Univ.) ;
  • Nam, Ki-Woo (Dept. of Materials Science and Engineering, Pukyong Nat'l Univ.)
  • 김정량 (부경대학교 대학원 학연협동기계공학과) ;
  • 최창민 (부경대학교 대학원 학연협동기계공학과) ;
  • 남기우 (부경대학교 재료공학과)
  • Received : 2011.08.03
  • Accepted : 2012.02.02
  • Published : 2012.04.01
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Abstract

In the past, a very popular way to reduce the corrosion rate of zinc was the use of chemical conversion layers based on $Cr^{+6}$. However, the use of chromium salts is now restricted because of environmental protection legislation. Previous research investigated the optimum corrosion resistance of galvanized steel treated with an organic/inorganic solution containing Si. The result showed that the optimum corrosion resistance occurred by heat treatment of $190^{\circ}C$ in 5 min. In this study, one organic and three hybrid organic/inorganic coating solutions were applied to cold-rolled (CR) carbon steel. The coatings were then evaluated for corrosion resistance under a salt spray test. The coating solutions examined in this study consisted of urethane-only, urethane-Si, urethane-Si-Ti, and urethane-Si-Ti-epoxy. The results of the 7 h salt spray test showed that the urethane-Si-Ti and urethane-Si-Ti-epoxy coating solutions had superior corrosion resistance on CR steel.

종래 아연의 부식 속도를 줄이는 가장 일반적인 방법은 $Cr^{+6}$를 도포하여 화학적으로 개조하는 것이었다. 그러나 $Cr^{+6}$는 현재 환경 보호법 때문에 사용이 제한되어 있다. 따라서 자자들은 Si를 가지는 유/무기 용액에 대한 아연도금강판의 최적 조건을 연구하였다. 최적 내식성은 $190^{\circ}C$에서 5분간 열처리한 조건으로 나타났다. 본 연구에서는 내식성 평가를 위하여 우레탄 용액(Urethane 20 wt.% ; S-700), Si를 가지는 유/무기 용액(Si polysilicate 10 wt.% + Urethane 10 wt.% LR-0317) 및 Si와 Ti를 가지는 2종류의 유/무기 용액(Si polysilicate 7 wt.% + Urethane 13 wt.% + Ti amorphous 0.5 wt.% ; LR-0727(1), Si polysilicate 7 wt.% + Urethane 7 wt.% + Ti amorphous 0.5 wt.% + epoxy 6wt.% ; LR-0727(2))을 사용하였다. 내식성 평가는 냉간압연 강판을 사용하여 염수분무 시험으로 실시하였다. 7시간의 염수 분무 시험에서 LR-0727(1)과 LR-0727(2) 용액이 냉간 압연 강판에 대하여 우수한 내식성을 나타내었다.

Keywords

References

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  1. Development of Organic/Inorganic Hybrid Coating Solution for High Strength Steel Sheet (SPFC780) vol.7, pp.6, 2016, https://doi.org/10.18178/ijcea.2016.7.6.614
  2. Corrosion Resistance of Galvanized Steel by Organic/Inorganic Hybrid Solution with Constant Amount of SiO2 Polysilicate and Melamine vol.22, pp.5, 2018, https://doi.org/10.9726/kspse.2018.22.5.036