The effect of manganese and silicon additions on the corrosion resistance of a polycrystalline nickel-based superalloy

被引：29
|
作者：
Anzini, E. [1 ]
Glaenzer, N. [2 ]
Mignanelli, P. M. [3 ]
Hardy, M. C. [3 ]
Stone, H. J. [2 ]
Pedrazzini, S. [1 ]
机构：
[1] Imperial Coll London, Dept Mat, Exhibit Rd, London SW7 2AZ, England
[2] Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England
[3] Rolls Royce Plc, POB 31, Derby DE24 8BJ, England
来源：
CORROSION SCIENCE | 2020年 / 176卷
基金：
英国工程与自然科学研究理事会;
关键词：
Nickel superalloy; Manganese; Silicon; Oxidation; Sulfur; Salt; Corrosion; HIGH-TEMPERATURE SULFIDATION; MORPHOLOGICAL DEVELOPMENT; HOT CORROSION; OXIDATION; MN; CHROMIUM; BEHAVIOR; SYSTEM; SO2; ATMOSPHERES;
D O I：
10.1016/j.corsci.2020.109042
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The service lives of nickel superalloys are often limited by environmental degradation. The present study compares oxidation, sulfidation and hot corrosion at 750 degrees C of three variants of a polycrystalline superalloy: a baseline alloy, a variant containing 1 wt% Mn and one containing 0.5 wt% Si. Mn reduced the oxidation rate without changing the scale morphology. The MnCr2O4 scale formed proved more protective against sulfidation and hot corrosion, but internal sulfides extended the damage depth. Si modified the oxide morphology to a continuous Cr2O3-Al2O3 dual layer. This provided improved protection, reducing the sulfidation depth by 2/3 and the hot corrosion depth by 1/2.
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页数：11
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