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<p>The structural properties, surface hardness, wear and corrosion behaviors of plasma- and gas-nitrided, PVD TiN coated and electroless Ni-B coated EN-GJS-700-2 (GGG-70) grade ductile cast iron (DI) were investigated in detail. The structural properties were examined with an optical microscope, a scanning electron microscope and x-ray diffraction. The surface hardness was tested with Vickers microhardness tests; the wear behavior was investigated by ball-on-flat linear reciprocating abrasion/friction tests and the corrosion behavior was studied by electrochemical tests. The 1.95&#xa0;µm PVD TiN coating had the hardest surface hardness with 2782 HV<sub>0.001</sub> value. All nitrided and coated specimens exhibited better wear and corrosion resistance than the DI-substrate. The PVD TiN coating demonstrated the best wear resistance with the lowest wear loss (0.231x10<sup>−3</sup> mm<sup>3</sup>) and the lowest friction coefficient value (0.16). Corrosion tests revealed that electroless Ni-B-coated specimens (0.002&#xa0;mm/year corrosion rate) and nitrided specimens (0.002&#xa0;mm/year for plasma- and 0.076&#xa0;mm/year corrosion rate for gas-nitrided) showed excellent corrosion resistance, while the PVD TiN-coated specimen (0.673&#xa0;mm/year corrosion rate) showed moderate corrosion protection0020.</p>

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Structural, Wear and Corrosion Properties of Nitrided, PVD and Electroless Ni-B Coated EN-GJS-700-2 Cast Iron

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Emre Ünalsan,
  • Mehmet Yildirim,
  • Aleyna Bayatlı,
  • Ozlem Altintas Yildirim

摘要

The structural properties, surface hardness, wear and corrosion behaviors of plasma- and gas-nitrided, PVD TiN coated and electroless Ni-B coated EN-GJS-700-2 (GGG-70) grade ductile cast iron (DI) were investigated in detail. The structural properties were examined with an optical microscope, a scanning electron microscope and x-ray diffraction. The surface hardness was tested with Vickers microhardness tests; the wear behavior was investigated by ball-on-flat linear reciprocating abrasion/friction tests and the corrosion behavior was studied by electrochemical tests. The 1.95 µm PVD TiN coating had the hardest surface hardness with 2782 HV0.001 value. All nitrided and coated specimens exhibited better wear and corrosion resistance than the DI-substrate. The PVD TiN coating demonstrated the best wear resistance with the lowest wear loss (0.231x10−3 mm3) and the lowest friction coefficient value (0.16). Corrosion tests revealed that electroless Ni-B-coated specimens (0.002 mm/year corrosion rate) and nitrided specimens (0.002 mm/year for plasma- and 0.076 mm/year corrosion rate for gas-nitrided) showed excellent corrosion resistance, while the PVD TiN-coated specimen (0.673 mm/year corrosion rate) showed moderate corrosion protection0020.