Abstract Low temperature plasma nitriding was performed on CrNi-based (AISI 316L), CrMn-based (AISI 202) and nickel-free (P558) austenitic stainless steels. For all the used steels modified surface layers consist mainly of S phase without the precipitation of large amounts of nitrides, and they show enhanced surface microhardness and corrosion resistance in NaCl acqueous solution. The different electrochemical corrosion testing techniques evidence that the increase of corrosion potential may be ascribed mainly to nitrogen addition, while regarding the increase of potential, at which localized corrosion phenomena occur, also alloy elements, and in particular Mo, play an important role.

中文翻译：

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低温氮化无镍、AISI 200 和 AISI 300 系列奥氏体不锈钢在 NaCl 溶液中的腐蚀行为

摘要 对CrNi 基（AISI 316L）、CrMn 基（AISI 202）和无镍（P558）奥氏体不锈钢进行低温等离子渗氮。所用钢的改性表面层主要由S相组成，没有大量氮化物析出，在NaCl水溶液中显示出增强的表面显微硬度和耐腐蚀性。不同的电化学腐蚀测试技术表明，腐蚀电位的增加可能主要归因于氮的添加，而对于发生局部腐蚀现象的电位的增加，合金元素，特别是钼，也起着重要作用。