Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Surface Modification Method of Stainless Steel using Electrochemical Etching

전기화학적 에칭을 이용한 스테인리스 스틸의 표면 개질

  • Lee, Chan (Department of Mechanical Engineering, POSTECH) ;
  • Kim, Joonwon (Department of Mechanical Engineering, POSTECH)
  • 이찬 (포항공과대학교 기계공학과) ;
  • 김준원 (포항공과대학교 기계공학과)
  • Received : 2013.12.30
  • Accepted : 2014.02.28
  • Published : 2014.04.01
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Abstract

This paper reports a simple, yet effective 1-step surface modification method for stainless steel. Electrochemical etching in dilute Aqua Regia forms hierarchical micro and nanoscale structure on the surface. The surface becomes highly hydrophobic (${\sim}150^{\circ}$) as a result of the etching in terms of static contact angle (CA). However the liquid drops easily pinned on the surface because of high contact angle hysteresis (CAH), which is called a "petal effect": The petal effect occur because of gap between surface microstructures, despite of intrinsic hydrophobicity of the base material. The pore size and period of surface structure can be controlled by applied voltage during the etching. This method can be applied to wide variety of industrial demand for surface modification, while maintaining the advantageous anti-corrosion property of stainless steel.

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References

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