Effect of Si Content on Cyclic Hot Corrosion of NiAl in Fused Na&lt;SUB&gt;2&lt;/SUB&gt;SO&lt;SUB&gt;4&lt;/SUB&gt;-NaCl Mixture

Kamide, Hidehiko; Tanaka, Yuichi

doi:10.2320/jinstmet1952.57.5_533

Cited by 3 publications

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“…The oxidation of Ni-Al system has also been comprehensively reviewed [6][7][8]. Hot corrosion of Ni-Al system is also an important topic, most of which, however, are mainly concentrated on the aluminide coatings [9][10][11][12][13][14][15][16]. Leyens et al [15] examined the effect of some precious metals on the hot corrosion resistance of NiAl, and observed that Pt-doped and Hf-doped NiAl exhibited poor corrosion resistance, while the addition of Cr to NiAl could improve its hot corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ag on the Hot Corrosion of NiAl Intermetallic Compound

Liu¹,

Wei²,

Lv³

et al. 2013

High Temperature Materials and Processes

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The low ambient tensile ductility and inadequate high temperature strength and creep resistance have limited the applications of intermetallic compound NiAl as a structure material at high temperatures. A small addition of Ag could increase the strength of NiAl. In this study, hot corrosion behavior of NiAl and NiAl-Ag containing 1 and 5%Ag (in weight percent), respectively, in molten (Na,K) 2 SO 4 at 1173 K has been examined by thermogravimetry and physical analysis techniques. The experimental results indicated that the corrosion rates of NiAl and NiAl-Ag tended to increase with exposure time, accompanied with the formation of nodules. Fast localized corrosion is the typical feature of the corrosion of both NiAl and NiAl-Ag. The addition of Ag to NiAl accelerated its corrosion, with a higher corrosion rate observed for the 5%Ag addition. The two-phase microstructure of NiAl-Ag alloys accelerated the formation of nodules in the regions close to Ag phases.

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