Nitriding using cathodic cage technique of martensitic stainless steel AISI 420 with addition of CH4

Sousa, Rômulo Ríbeiro Magalhães de; Araújo, F.O. de; Costa, J.A.P. da; Sousa, R. S. de; Alves, Clodomiro

doi:10.1590/s1517-70762008000200012

Cited by 2 publications

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References 10 publications

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“…5) Plasma ion nitriding process is broadly applied in order to improve mechanical property. 6,7) In particular, plasma ion nitriding treated at low temperature produces improvement of tribological properties and anti-corrosion characteristics due to a formation of nitrogen precipitation at surface hardening layer. 8,9) Li et al studied corrosion characterization on plasma nitrided martensitic stainless steel in NaCl and HCl.…”

Section: Introductionmentioning

confidence: 99%

Synergistic damage mechanism of corrosion and cavitation-erosion for plasma ion nitrided 18Cr–8Ni–1.1Mn–0.43C stainless steel in seawater

Chong

Kim

2016

Jpn. J. Appl. Phys.

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In this work, it was investigated that resistance of combination damages of electrochemical corrosion and cavitation-erosion for plasma ion nitrided 18Cr–8Ni–1.1Mn–0.43C stainless steel at various process temperatures under cavitation environment in seawater. The plasma ion nitriding treatment was performed with a gas mixture ratio of 25% N2 and 75% H2 at a temperature of 623, 673, 723, and 773 K for 10 h, at a chamber pressure of 250 Pa. Expanded austenite (γN) was produced at whole plasma ion nitriding temperatures and especially phases of CrN and γ′ were observed at 773 K in X-ray diffraction (XRD) analysis. In Tafel analysis, the highest corrosion potential and corrosion current density were analyzed on the untreated (non-cavitation) specimen among specimens under the cavitation condition. Under cavitation environment, the highest corrosion potential and the lowest corrosion current density presented at 673 K. As a result of observation of surface morphologies after anodic polarization experiment under cavitation environment, uniform corrosion was observed on the untreated specimen and plasma ion nitrided specimens, while localized corrosion was shown on the untreated substrate under non-cavitation environment. Furthermore, greater damage depth and severe morphologies were observed at plasma ion nitrided specimens than untreated substrate, whereas the greatest weight loss at 723 K was indicated due to the high pitting corrosion potential and wide passivity potential region.

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