摘要
利用连续波CO2激光器分别在H13钢表面激光熔覆N iFeBSi-Si3N4和N iFeBSi合金,考察了Si3N4对N iFeB-Si合金组织及腐蚀性能的影响。采用光学显微镜、扫描电子显微镜、X射线衍射仪及动电位极化技术对熔覆层的组织及腐蚀性能进行研究。结果表明,N iFeBSi-Si3N4合金激光熔覆层与H13钢基体形成了良好的冶金结合,改性层呈细密的枝晶状组织,无孔洞裂纹等缺陷。与N iFeBSi合金相比,N iFeBSi-Si3N4合金激光改性层在工业用脱膜剂介质中腐蚀电位正移,腐蚀电流密度下降,抗孔蚀能力提高。
Laser surface cladded NiFeBSi-Si3N4 and NiFeBSi alloys layers on H13 steel surface were produced by continuous wave CO2 laser irradiation, respectively. The effects of Si3N4 on the microstructure and electrochemical corrosion behavior of the laser treated layer were studied using OM, SEM, XRD and potentiodynamic polarization tests. The results show that good metallurgical bonding is formed between the NiFeBSi-Si3N4 cladded layers and the H13 steel substrate. The modified surface cladding layer consists of a fine dendritic structure and without porosity and crackfree. Compared with laser cladded of NiFeBSi alloy, the NiFeBSi-Si3N4 alloy layer exhibited higher resistance to pitting corrosion in industrial die coating solution. The passive film resistances increased and the passive current density decreased.
出处
《金属热处理》
CAS
CSCD
北大核心
2006年第9期49-51,共3页
Heat Treatment of Metals
基金
国家高技术研究发展计划(863计划2002AA305203)
辽宁省科学技术基金(20031024)
辽宁省教育厅科学研究计划(2004D011
05L301)
