High temperature scaling of Ni-15Cu-5Al alloy in 1×10⁵ Pa pure oxygen

Abstract

The oxidation of the ternary alloy Ni-15Cu-5Al in 1×10⁵ Pa pure oxygen at 700 °C and 800 °C was studied. The results show that the behavior of the Ni-rich alloy is similar to that of the binary Ni-Al alloy with the same Al content in the form of an external NiO layer coupled to the internal oxidation of aluminium. The presence of 15% (mole fraction) Cu cannot modify substantially the values of relevant parameters affecting the transition from the internal to the external oxidation of aluminium. The presence of 5% Al reduces the oxidation rate of the corresponding Ni-Cu alloy during the whole oxidation stages, though 5% Al is still insufficient to form protective external alumina scales.

Keywords

Ni-rich alloy / high temperature oxidation / ternary alloy

References

[1] HaugsrudR. On the influence of non-protective CuO on high-temperature oxidation of Cu-rich Cu-Ni based alloys[J]. Oxid Met, 1999, 52: 427-445

[2] VillarsP, PrinecA, OkamotoHHandbook of Ternary Alloy Phase Diagrams [M], 1997, Materials Park, Ohio, ASM International

[3] MassalskiT B, MurryJ L, BennettL H, et al.Binary Alloys Phase Diagrams[M], 1986, Materials Park, Ohio, ASM

[4] PettitF S. Oxidation mechanisms for nickel-aluminum alloys at temperatures between 900 °C and 1 300 °C [J]. Trans Met Soc AIME, 1967, 239: 1296-1305

[5] WoodG C, StottF HHigh Temperature Corrosion [M], 1983, Houston, NACE: 227-227

[6] WagnerC. Types of reaction in the oxidation of alloys [J]. Z Electrochem, 1959, 63: 772-782(in German)

[7] KofstadPHigh Temperature Corrosion[M], 1988, New York, Elsevier Applied Science

[8] RappR A. Kinetics, microstructure and mechanism of internal oxidation—its effect and prevention in high temperature alloy oxidation[J]. Corrosion, 1965, 21: 382-401

[9] GesmundoF, VianiF. Transition from internal to external oxidation for binary alloys in the presence of outer scale[J]. Oxid Met, 1986, 25: 269-282

[10] ParkJ W, AltstetterC J. The diffusion and solubility of oxygen in solid nickel[J]. Met Trans, 1987, 18A: 43-43

[11] GuanS W, YiH C, SmeltzerW W. Internal oxidation of ternary alloys: kinetics in the absence of an external scale[J]. Oxid Met, 1994, 41: 377-387

[12] GesmundoF, NiuY. The single oxidation of the most reactive component under low oxidant pressures [J]. Oxid Met, 2003, 60: 347-370

[13] KirkaldyJ, YoungD JDiffusion in the Condensed State[M], 1987, London, The Institute of Metals

[14] XiangJun-huai, NiuYan, WuWei-tao. Oxidation of a ternary Cu-10Ni-5Al alloy in 1×10⁵ Pa pure O₂ at 700–800 °C [J]. Rare Metal Materials and Engineering, 2004, 33(10): 1104-1107(in Chinese)

[15] WhittleD P, WoodG C. Two-phase scale formation on Cu-Ni alloys[J]. Corros Sci, 1968, 8: 295-308