CHARACTERISTICS OF AISI 420 STAINLESS STEEL MODIFIED BY COMBINING GAS NITRIDING AND CrN COATING

IF 1.1 Q3 METALLURGY & METALLURGICAL ENGINEERING Acta Metallurgica Slovaca Pub Date : 2021-09-13 DOI:10.36547/ams.27.3.1035

T. Nguyen, V. T. Doan, Trung Van Trinh, Huy Van Vu

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引用次数: 1

Abstract

AISI 420 stainless steel is widely used in applications where wear and corrosion resistance are required. However, the heat treatment and nitriding process can drastically reduce the corrosion resistance of this stainless steel. This article focuses on investigating the influence of steel substrate and gas nitriding efficiency at two temperatures of 520 oC and 550 oC on some properties of CrN coating. The experiments were carried out to evaluate the surface hardness, microstructure and phase composition of nitrided layers. The coating adhesion and load capacity of the coating were performed according to VDI 3198 standard. Electrochemical testing was performed in a solution of 3.5% NaCl and then using the Tafel method to determine the corrosion current and corrosion potential. The thickness of CrN and CrN/CrN coating was 1.6 μm and 3 μm, respectively. The study showed that the corrosion resistance of coatings fabricated through duplex technology was affected not only by the normal defects but also by the porosity on the nitrided surface. The corrosion resistance of multilayer duplex coating was improved compare with mono-layer duplex coating due to its ability to cover and reduce pores and pitting defects.

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气体氮化与CrN涂层复合改性AISI 420不锈钢的性能

AISI 420不锈钢广泛用于要求耐磨损和耐腐蚀的应用场合。然而，热处理和氮化工艺会大大降低这种不锈钢的耐腐蚀性。本文重点研究了520℃和550℃两种温度下钢基体和气体氮化效率对CrN涂层某些性能的影响。通过实验对渗氮层的表面硬度、显微组织和相组成进行了评价。按照VDI 3198标准对涂层的附着力和承载能力进行了测试。在3.5% NaCl溶液中进行电化学测试，然后用Tafel法测定腐蚀电流和腐蚀电位。CrN涂层厚度为1.6 μm, CrN/CrN涂层厚度为3 μm。研究表明，通过双相工艺制备的涂层的耐蚀性不仅受正常缺陷的影响，还受渗氮表面孔隙率的影响。多层双相涂层的耐蚀性比单层双相涂层有所提高，这是由于多层双相涂层能够覆盖和减少气孔和点蚀缺陷。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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