Corrosion of alumina-forming austenitic steel in molten nitrate salts by gravimetric analysis and impedance spectroscopy

被引：95

作者：

Fernandez, A. G. ^{[1
]}

Rey, A. ^{[1
]}

Lasanta, I. ^{[1
]}

Mato, S. ^{[1
]}

Brady, M. P. ^{[2
]}

Perez, F. J. ^{[1
]}

机构：

[1] Univ Complutense Madrid, Fac Ciencias Quim, Dept Ciencia Mat, E-28040 Madrid, Spain

[2] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

来源：

MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION | 2014年 / 65卷 / 03期

关键词：

austenitic steels; hot corrosion; molten nitrate; solar plants; STAINLESS-STEELS; MIXTURES; ALLOYS;

D O I：

10.1002/maco.201307422

中图分类号：

T [工业技术];

学科分类号：

120111 [工业工程];

摘要：

In recent years, the study of renewable energies and its practical application has increased significantly. Solar energy feasibility entails the development of energy storage systems since solar power plants need to be working in unfavorable weather or night periods. The main heat transfer fluid (HTF) used on these plants is a salt mixture of 60% NaNO3/40% NaNO3 which must be kept above 220 degrees C to prevent freezing. This high operating temperature causes corrosion problems for steels in contact with the HTF, reducing the lifetime of the solar plants. The present research studies the potential of an alumina-forming austenitic (AFA) stainless steel (OC-4, Fe-25Ni-14Cr-3.5Al-2.5Nb wt% base) as a candidate material for solar plant heat exchangers and pipes. Corrosion behavior of OC-4, relative to 304 stainless steel and T22 steel, was studied by gravimetric analysis and electrochemical impedance spectroscopy (EIS). The AFA OC-4 exhibited better corrosion resistance in HTF at 390 degrees C than the currently used 304 austenitic stainless steel.

引用

页码：267 / 275

页数：9

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