ABSTRACT

In this study, three different types of stainless steels, AISI 304, AISI 420, and AISI 430 were pack borided under 850 °C–925 °C–1000 °C for 2, 4, and 6 h, respectively. Morphologies of coating were investigated by optical and scanning electron microscope (SEM). The maximum layer hardness was determined to be 1736 HV_0.05, 1659 HV_0.05, and 1572 HV_0.05 for AISI 304, AISI 420, and AISI 430, respectively. Phases formed on the layer were determined by X-ray analysis (XRD) to confirm the presence of FeB, Fe₂B, CrB, and MnB phases. Boride layer morphology was found to be a planar and compact structure. The activation energies of the coating were investigated. The corrosion resistance values of stainless steels were determined from the static immersion tests performed in 10% HCl solution. There was a remarkable increase in the corrosion resistance of borided steel compared to that of untreated samples.

摘要

在本研究中，三种不同类型的不锈钢 AISI 304、AISI 420 和 AISI 430 分别在 850 °C–925 °C–1000 °C 下进行了 2、4 和 6 小时的填充硼化。通过光学和扫描电子显微镜 (SEM) 研究了涂层的形貌。对于 AISI 304、AISI 420 和 AISI 430，最大层硬度确定为 1736 HV _0.05、1659 HV _0.05和 1572 HV _0.05。通过 X 射线分析 (XRD) 确定在层上形成的相以确认 FeB、Fe ₂的存在B、CrB 和 MnB 相。发现硼化物层形态是平面且致密的结构。研究了涂层的活化能。不锈钢的耐蚀性值由在 10% HCl 溶液中进行的静态浸泡试验确定。与未经处理的样品相比，渗硼钢的耐腐蚀性能显着提高。