球墨铸铁粉末渗硼的耐蚀性能研究  

Study on Corrosion Resistance of Ductile Cast Iron with Boride Layer

作　　者：赵景浩[1] 罗宏[1,2] 

机构地区：[1]四川理工学院材料与化学工程学院,四川自贡643000 [2]材料腐蚀与防护四川省高校重点实验室,四川自贡643000

出　　处：《热加工工艺》2014年第12期166-169,180,共5页Hot Working Technology

基　　金：材料腐蚀与防护四川省高校重点实验室开放基金资助项目(2010CL04)

摘　　要：对球墨铸铁在不同温度和时间下分别进行渗硼处理,采用金相显微镜观察了渗硼层的形貌,测定了渗硼层的厚度;用显微硬度计测定了渗硼层的表面硬度;用X射线衍射仪分析了渗硼层的物相组成;用扫描电镜测定了渗硼层表面元素含量;并在10%的HCl、H2SO4、HNO3、NaCl、NaOH溶液中做了耐蚀性对比试验。结果表明:渗硼层厚度均匀,呈齿状结构与基体结合牢固,渗硼层主要由Fe2B单相组成;在950℃下保温不同时间,渗硼层的厚度及硬度均随时间的增长而逐渐增大;在不同温度下保温5 h时,渗硼层厚度随温度的升高而逐渐增大,渗硼层的硬度随温度的升高先增大后减小,除HNO3外,渗硼处理后试样的耐蚀性均比未渗硼的试样的耐蚀性能好。Ductile cast Iron was borided at different temperature and different time. The boride layer of the cross-section morphology was observed and the thickness of the boride layer was tested by microscope. The surface hardness of boride layer was tested by Vickers hardness tester. The phase composition of boride layer was analyzed by XRD. element content of the boride layer was tested by EDS, and the corrosion resistance tests of the boride layer were carried out in 10% HCI, HaSO4,HNO3, NaCl, NaOH. The results show that the thickness of the boronizing layer is distributed; boride layer is firmly bonded to the substrate as the dentate structure. Boride layer is mainly composed of Fe2B. When the temperature is 950 ℃, the thickness and hardness of the boronizing layer gradually increase with the increase of time. When the time is 5 h, the thickness of the boronizing layer gradually increases with the increase of temperature, but the hardness of the boronizing layer increases at first and decreases later with the increase of temperature. In addition to FINO3, the corrosion resistances of borided samples are better than the samples without boron penetration.

关 键 词：球墨铸铁 渗硼 厚度 显微硬度 耐蚀性 

分 类 号：TG156.1[金属学及工艺—热处理]