Improved hot corrosion resistance of Dy-Co-modified aluminide coating by pack cementation process on nickel base superalloys

Improved hot corrosion resistance of Dy-Co-modified aluminide coating by pack cementation process on nickel base superalloys
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镍基高温合金包渗工艺提高 Dy-Co 改性铝化物涂层的热腐蚀性能

DOI:
10.1016/j.corsci.2016.09.011
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发表时间:
2016-11
期刊:
影响因子:
8.3
通讯作者:
Chungen Zhou
Chungen Zhou
中科院分区:
材料科学1区
文献类型:
--
作者:
Pei Yuwen;Chungen Zhou

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采用复合渗碳法在DZ125镍基高温合金表面制备了Dy-Co变质铝化物涂层。研究了涂层的组织结构和热腐蚀行为。结果表明,镀态涂层为双层结构。涂层外层主要由Al0.9Ni1.1和弥散分布的Dy2Hf2O7组成。涂层在900℃、75wt.%Na2SO4+25wt.%氯化钠溶液中腐蚀100h后,增重率为0.23 mg/cm2,腐蚀产物为Al_2O_3。讨论了Dy在提高耐热腐蚀性能中的作用。
Dy-Co-modified aluminide coating was deposited onto Ni-based superalloy DZ125 using pack cementation method. The microstructure and hot corrosion behavior of the coating were investigated. The results show that as-deposited coating has a two-layer structure. The outer layer of the coating is composed mainly of Al0.9Ni1.1with dispersed Dy2Hf2O7. The mass gain of the coating is 0.23 mg/cm2after exposure to 75 wt.% Na2SO4+ 25 wt.% NaCl at 900 °C for 100 h. The corrosion product formed on the coating is characterized as Al2O3. Role of Dy in the improvement of the hot corrosion resistance has been discussed.
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