20钢热浸镀铝工艺及力学性能研究

发布时间：2019-05-25 01:23

【摘要】：为提高20钢的防腐、耐热及抗高温氧化性能,以6%KF+2%ZnCl_2为助镀剂,在其表面形成热浸镀铝镀层,采用扫描电子显微镜(Scanning Electron Microscopy,SEM)、HVS-1000显微硬度计和Nano-2000纳米压痕仪等对该镀层分别进行了表面形貌与组织结构观察、显微硬度与纳米硬度测量及弹性模量测量等。结果表明:该镀层由表层的铝层及次表层的铁铝合金层组成,表面及剖面均无开裂与漏镀现象,镀层与基体之间为冶金结合;随着浸镀时间的延长,铝层厚度变化不明显,而铁铝合金层厚度呈抛物线增长;测得铝层显微硬度为57.6 HV_(0. 03),纳米硬度为2.3 GPa,铁铝合金层的显微硬度为781.5 HV_(0.1),纳米硬度为9.2 GPa;铁铝合金层与20钢基体弹性模量基本相当,其平均值均为223 GPa。
[Abstract]:In order to improve the anticorrosion, heat resistance and high temperature oxidation resistance of 20 steel, hot dip aluminum coating was formed on the surface of 20 steel with 6%KF 2%ZnCl_2 as plating aid. Scanning electron microscope (Scanning Electron Microscopy,SEM) was used. The surface morphology, microstructure, microhardness and nano-hardness and elastic modulus of the coating were observed by HVS-1000 microhardness tester and Nano-2000 nano-indentation instrument, respectively. The results show that the coating is composed of aluminum layer on the surface layer and iron-aluminum alloy layer on the subsurface layer. There is no cracking and leakage plating on the surface and profile, and there is a metallurgical bond between the coating and the substrate. With the prolongation of dipping time, the thickness of aluminum layer does not change obviously, but the thickness of iron-aluminum alloy layer increases parabola, and the microhardness of aluminum layer is 57.6 HV_ (0. 5%). The microhardness of Fe-Al alloy layer with nano-hardness of 2.3 GPa, is 781.5 HV_, and the elastic modulus of Fe-Al alloy layer with nano-hardness of 9.2 GPa; is basically the same as that of 20 steel, with an average value of 223 GPa..
【作者单位】：装甲兵工程学院装备维修与再制造工程系;
【基金】：军队科研计划项目
【分类号】：TG174.4

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