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主管单位 中华人民共和国
工业和信息化部
主办单位 中国材料研究学会
哈尔滨工业大学
主编 苑世剑 国际刊号ISSN 1005-0299 国内刊号CN 23-1345/TB

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引用本文:王盼航,余竹焕,张洋,刘蓓蕾.预氧化对一种镍基单晶高温合金的热腐蚀影响[J].材料科学与工艺,2018,26(6):36-42.DOI:10.11951/j.issn.1005-0299.20170428.
WANG Panhang,YU Zhuhuan,ZHANG Yang,LIU Beilei.Effect of pre-oxidation on hot corrosion of a nickel-base superalloy[J].Materials Science and Technology,2018,26(6):36-42.DOI:10.11951/j.issn.1005-0299.20170428.
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预氧化对一种镍基单晶高温合金的热腐蚀影响
王盼航,余竹焕,张洋,刘蓓蕾
(西安科技大学 材料科学与工程学院, 西安 710054)
摘要:
为了解预氧化对镍基单晶高温合金的短时热腐蚀影响,采用涂盐法研究了一种高温合金经预氧化后在Na2SO4-NaCl盐膜条件下的热腐蚀行为,测量了不同预氧化处理时间合金的腐蚀动力学曲线,借助扫描电子显微镜(SEM)观察了合金腐蚀层截面的微观组织,并利用X-射线衍射仪(XRD)确定相结构.结果表明:未经过预氧化处理的合金表面腐蚀严重,热腐蚀增重质量最多达到0.033 mg/cm2,其腐蚀动力学曲线遵循抛物线规律,而经过预氧化处理后合金表面腐蚀明显改善;合金在900 ℃下的热腐蚀符合硫化氧化模型,腐蚀产物出现了分层结构;合金的主要腐蚀产物是NiO、Al2O3以及少量NiCr2O4、TiO2、NiS2等, 其中Al2O3、TiO2等氧化物位于氧化层最外层;预氧化生成的Al2O3层对高温合金在Na2SO4-NaCl盐膜下的短时热腐蚀有明显的保护作用,腐蚀层厚度从170 μm降低至80 μm.致密的氧化物保护层能够显著阻止硫元素的扩散,提高合金的耐热腐蚀性能.
关键词:  镍基高温合金  预氧化  热腐蚀:Na2SO4-NaCl  硫化氧化模型
DOI:10.11951/j.issn.1005-0299.20170428
分类号:TG174.45
文献标识码:A
基金项目:国家自然科学基金项目(51201130);陕西省教育厅专项科研计划项目(15JK1487).
Effect of pre-oxidation on hot corrosion of a nickel-base superalloy
WANG Panhang,YU Zhuhuan,ZHANG Yang,LIU Beilei
(College of Material Science and Engineering,Xi′an University of Science and Technology,Xi′an 710054, China)
Abstract:
To understand the effect of pre-oxidation on short-term hot corrosion of nickel-based single crystal superalloys, salt corrosion method was used to study the hot corrosion behavior of a superalloy after pre-oxidation under Na2SO4-NaCl salt solution. The corrosion kinetics curves of different pre-oxidation treatment time of the alloy were measured, the microstructure of the cross-section of the alloy corrosion layer was observed with a scanning electron microscope (SEM), and the phase structure was confirmed by X-ray diffraction (XRD). The result showed that the alloy surface without pre-oxidation was severely corroded, hot corrosion weight gain reached the maximum mass 0.033 mg/cm2,and the corrosion kinetic curve followed the parabolic law. After pre-oxidation treatment, the corrosion of the alloy surface was obviously improved, the hot corrosion of the alloy at 900 ℃ accorded with the model of sulfurization oxidation,and corrosion products appeared layered structure. The main corrosion products of the alloy were NiO, Al2O3, a small amount of NiCr2O4, TiO2, NiS2, and so on, among which oxides such as Al2O3, TiO2 located on the outermost layer of the oxide layer. The pre-oxidized Al2O3 layer had a significant protective effect on short-term hot corrosion of superalloy under Na2SO4-NaCl salt film.The thickness of the etching layer was reduced from 170 μm to 80 μm. A dense oxide layer could significantly prevent the diffusion of sulfur and improve the hot corrosion resistance of the tested alloy.
Key words:  nickel-base superalloy  pre-oxidation  hot corrosion  Na2SO4-NaCl  model of sulfurization oxidation

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