Electrochemical analysis of corrosion and wear resistance characteristics of stainless steel modified by friction reforming under micro-reciprocating frictional conditions in seawater

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  • ZHU Yao
    Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology
  • FUJINO Toshikazu
    Department of Marine Electronics and Mechanical Engineering, Tokyo University of Marine Science and Technology
  • JIBIKI Tatsuhiro
    Department of Marine Electronics and Mechanical Engineering, Tokyo University of Marine Science and Technology

Abstract

<p>As the utilization of ocean resources continues to increase, the performance and reliability of equipment used in the marine environment will become more important. Many friction and contact parts in equipment used in the marine environment directly or indirectly contribute to the service life and efficiency of various equipment and structures. Therefore, materials used in sliding parts in contact with seawater need to have both superior corrosion resistance and superior wear resistance. To develop friction-resistant materials adapted to the marine environment, the surface of 18Cr-8Ni austenitic stainless steel was modified to add superior properties of corrosion and wear resistance. This stainless steel was modified with silicon powders or silicon carbide powders mixed with fine high-speed-steel particles, which acted as carrier particles in a friction reforming technique. After that, zinc anticorrosive coating was applied to the modified materials by surface pressing and rubbing of a zinc pin for sacrificial corrosion protection. Corrosion and friction testing was conducted in parallel in a 3.5% sodium chloride solution to simulate seawater under static and dynamic reciprocating motion conditions. The polarization curves and friction and wear characteristics of these modified materials were evaluated. As a result, the modified materials, especially stainless steel modified with mixed silicon and silicon carbide powders, exhibited better wear resistance than unmodified stainless steel in seawater. In addition, the corrosion rates of the modified materials and the substrate stainless steel were almost the same under the micro-reciprocating friction condition. Therefore, it was shown that the modified materials, especially stainless steel with mixed silicon and silicon carbide powders, exhibited excellent properties as friction-resistant materials in a marine environment.</p>

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