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首页> 外文期刊>Materials Research >Cathodic cage plasma nitriding of austenitic stainless steel (AISI 316): influence of the working pressure on the nitrided layers properties
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Cathodic cage plasma nitriding of austenitic stainless steel (AISI 316): influence of the working pressure on the nitrided layers properties

机译：奥氏体不锈钢的阴极笼等离子体氮化（AISI 316）：工作压力对氮化层性能的影响

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In this work, the influence of working pressure on the characteristics of the layers produced by the nitriding treatment on the AISI 316 austenitic stainless steel surface using the Cathodic Cage Plasma Nitriding technique (CCPN) is assessed. The treatments were carried out at a temperature of 723 K for 5 hours under working pressures of 120, 250 and 500 Pa. The morphology, microstructure and corrosion resistance were studied through optical microscopy, x-ray diffraction, and electrochemical potential curves. We analyzed the effects of working pressure on the layer thickness, microhardness and corrosion resistance. The E×i curves and the electrochemical impedance of polarized samples were measured in order to investigate the effect of the ion transfer inside the produced film placed into the anodic solution. The electrochemical impedance of the films were measured, and showed an apparent capacitive behavior. For treatment under a pressure of 120 Pa we found the nitrides Fe3N, Fe4N and CrN. For treatment at a pressure of 250 Pa, the CrN disappears and the observed phases are the nitrides Fe3N, Fe4N and the S-phase. For a treatment pressure of 500 Pa there is an increase in the corrosion resistance of nitrided layers, confirmed by the predominance of S-Phase in the x-ray diffraction pattern. On the other hand, the sample nitrided under the pressure of 250 Pa showed very unstable impedance behavior when immersed in NaCl solution, indicating that the treatment at this specific working pressure has a negative effect on the corrosion resistance of plasma nitrided AISI 316 stainless steel surfaces.
机译：在这项工作中，评估了使用阴极笼式等离子体氮化技术（CCPN）对AISI 316奥氏体不锈钢表面进行渗氮处理所产生的层的特性对工作压力的影响。在723 K的温度下，在120、250和500 Pa的工作压力下进行了5小时的处理。通过光学显微镜，X射线衍射和电化学势曲线研究了形貌，微观结构和耐腐蚀性。我们分析了工作压力对涂层厚度，显微硬度和耐腐蚀性的影响。测量了极化样品的E×i曲线和电化学阻抗，以研究离子转移到置于阳极溶液中的薄膜内部的影响。测量了膜的电化学阻抗，并表现出明显的电容行为。对于在120 Pa压力下的处理，我们发现了氮化物Fe3N，Fe4N和CrN。对于在250 Pa压力下的处理，CrN消失，观察到的相为氮化物Fe3N，Fe4N和S相。对于500 Pa的处理压力，氮化层的耐蚀性得到了提高，这可以通过X射线衍射图中的S相占优势来确认。另一方面，在250 Pa压力下氮化的样品浸入NaCl溶液时表现出非常不稳定的阻抗行为，这表明在此特定工作压力下进行的处理对等离子氮化AISI 316不锈钢表面的耐腐蚀性产生负面影响。 。

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