Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effect of Phosphate Surface Treatment on the Localized Corrosion Resistance of UNS G41400 Steel

UNS G41400 강의 인산염 표면 처리에 따른 국부 부식 저항성

  • Jun-Seob Lee (School of Materials Science and Engineering, Changwon National University) ;
  • Siwook Park (Agency for Defense Development)
  • 이준섭 (국립창원대학교 신소재공학부) ;
  • 박시욱 (국방과학연구소)
  • Received : 2023.11.28
  • Accepted : 2023.12.04
  • Published : 2023.12.29
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Abstract

This study investigated the localized corrosion behavior of a UNS G41400 steel surface treated with manganese phosphate. The phosphate coating, primarily composed of oxygen (O), phosphorus (P), and manganese (Mn) elements, had an approximate thickness of 6 ㎛. The particles comprising the coating varied in size by several micrometers; smaller particles were mainly composed of O, P, Mn, and iron (Fe) elements, indicating incomplete formation of the manganese phosphate film. Potentiodynamic polarization curves revealed a decrease in anodic current after surface treatment and a shift in corrosion potential toward the noble direction after treatment. After immersion in a 3.5 wt% NaCl solution for 96 hours, localized corrosion was observed, with some regions retaining residual phosphate film. Even though localized corrosion occurred on the treated surface, it was less severe than that on the untreated UNS G41400 steel surface. These findings suggest that manganese phosphate coating improved resistance to localized corrosion.

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Acknowledgement

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