渗氮
材料科学
腐蚀
冶金
奥氏体
氮化物
图层(电子)
等离子体
表层
透射电子显微镜
氮化铬
硬度
微观结构
复合材料
纳米技术
物理
量子力学
作者
Z. L. Zhang,Thomas A. Bell
标识
DOI:10.1179/sur.1985.1.2.131
摘要
AISI316 stainless steel has been plasma nitrided at 570°C over a range of processing conditions, and the resultant corrosion properties have been investigated by a potentiodynamic polarization technique. X-ray diffraction and transmission electron microscopy studies have been used to map the process parameters under which a duplex surface compound layer of γ’ phase and austenite is formed. This surface compound layer has better corrosion resistance than a plasma nitrided stainless steel surface, where the normal hardened layer consists of austenite’ and chromium nitride precipitates. It has been found that the improvement in corrosion resistance is related to the presence of the γ’ nitride. Furthermore; low temperature plasma nitriding at 400° C produces a nitrided layer which has a corrosion resistance equivalent to that of the original material.
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