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Titolo:
Improvement of corrosion resistance of materials coated with a Cr2O3/NiCr dilayer using a sealing treatment
Autore:
Li, CL; Zhao, HX; Takahashi, T; Matsumura, M;
Indirizzi:
Hiroshima Univ, Dept Chem Engn, Higashihiroshima 7398527, Japan Hiroshima Univ Higashihiroshima Japan 7398527 hihiroshima 7398527, Japan Japan Ultra High Temp Mat Res Ctr, Ube, Yamaguchi 7550001, Japan Japan Ultra High Temp Mat Res Ctr Ube Yamaguchi Japan 7550001 0001, Japan
Titolo Testata:
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
fascicolo: 1-2, volume: 308, anno: 2001,
pagine: 268 - 276
SICI:
0921-5093(20010630)308:1-2<268:IOCROM>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
FUNCTIONALLY GRADIENT MATERIALS; SPRAYED CERAMIC COATINGS; SLURRY EROSION; BEHAVIOR; ALLOYS;
Keywords:
plasma spraying; dilayer coated materials; sealing treatment; corrosion; microstructure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Li, CL Hiroshima Univ, Dept Chem Engn, 1-4-1 Kagamiyama, Higashihiroshima 7398527, Japan Hiroshima Univ 1-4-1 Kagamiyama Higashihiroshima Japan 7398527 pan
Citazione:
C.L. Li et al., "Improvement of corrosion resistance of materials coated with a Cr2O3/NiCr dilayer using a sealing treatment", MAT SCI E A, 308(1-2), 2001, pp. 268-276

Abstract

A sealing treatment has been applied to diminish the effects of the pores and micro-cracks on the corrosion properties of the plasma-sprayed Cr2O3/NiCr dilayer coatings. This treatment decreased the porosity both in the ceramic and in the NiCr dilayer and effectively improved the corrosion resistance The sealing treatment involved the use of polymethyl silicon and vinyl methyl silicon. Two compositions of plasma sprayed Cr2O3/NiCr dilayer coatedmaterials (Cr2O3/80NiCr/316 and Cr2O3/50NiCr/316) were studied. Optical microscopy and scanning electron microscopy demonstrated that all of the openpores in Cr2O3/NiCr dilayer were blocked by the sealant resin and only closed pores were remained. The ceramic and sealing resin formed a compact layer without open pores. which protected the materials beneath against corrosion. Corrosion tests of the sealed and unsealed specimens showed that the corrosion resistance of the Cr2O3/NiCr dilayer coated materials increased markedly after the sealing treatment. Electrochemical experiments showed thatafter the sealing treatment the difference in corrosion resistance betweenthe sealed Cr2O3/80NiCr/316 and Cr2O3/50NiCr/316 was very small probably because the corrosive environment served to mask the effect of the 80NiCr and 50NiCr on the corrosion properties of the dilayer coated materials. Sealed specimens showed small weight grains due to the absorption of water in the resin. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 08/07/20 alle ore 06:04:01