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http://dx.doi.org/10.5916/jkosme.2017.41.3.238

Effects of plasma ion nitriding temperature using DC glow discharge on improvement of corrosion resistance of 304 stainless steel in seawater  

Chong, Sang-Ok (Division of Marine Engineering, Mokpo National Maritime University)
Park, Il-Cho (Division of Marine Engineering, Mokpo National Maritime University)
Kim, Seong-Jong (Division of Marine Engineering, Mokpo National Maritime University)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.41, no.3, 2017 , pp. 238-244 More about this Journal
Abstract
Plasma ion nitriding has been widely used in various industries to improve the mechanical properties of materials, especially stainless steels by increasing the surface hardness. It has the particular advantages of less distortion compared to that in the case of hardening of steel, gas nitriding, and carburizing; in addition, it allows treatment at low-temperatures, and results in a high surface hardness and improved corrosion resistance. Many researchers have demonstrated that the plasma ion nitriding process should be carried out at temperatures of below $450^{\circ}C$ to improve corrosion resistance via the formation of the expanded austenite phase(S-phase). Most experimentals studied to date have been carried out in chloride solutions like HCl or NaCl. However, the electrochemical characteristics for the chloride solutions and natural seawater differ. Hence, in this work, plasma ion nitriding of 304 stainless steels was performed at various temperatures, and the electrochemical characteristics corresponding to the different process temperatures were analyzed for the samples in natural seawater. Finally the optimum plasma ion nitriding temperature that resulted in the highest corrosion resistance was determined.
Keywords
Plasma ion nitriding; Stainless steel; Expanded austenite(S-phase); Seawater; Corrosion resistance;
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