Formation of Al2O3/FeAl coatings on a 9Cr-1 Mo steel, and corrosion evaluation in flowing Pb-17Li loop

被引：37

作者：

Majumdar, Sanjib ^{[1
]}

Paul, Bhaskar ^{[1
]}

Chakraborty, Poulami ^{[2
]}

Kishor, Jugal ^{[1
]}

Kain, Vivekanand ^{[1
]}

Dey, Gautam Kumar ^{[2
,3
]}

机构：

[1] Bhabha Atom Res Ctr, Mat Proc & Corros Engn Div, High Temp Mat Dev Sect, Bombay, Maharashtra, India

[2] Bhabha Atom Res Ctr, Div Mat Sci, Bombay, Maharashtra, India

[3] Bhabha Atom Res Ctr, Mat Grp, Bombay, Maharashtra, India

来源：

JOURNAL OF NUCLEAR MATERIALS | 2017年 / 486卷

关键词：

Iron aluminide; Alumina; Liquid metal corrosion; Protective scale; Tritium permeation barrier; PERMEATION BARRIERS; ALUMINIDE COATINGS; EUROFER STEEL; TRITIUM PERMEATION; EUTECTIC PB-17LI; STAINLESS-STEEL; BEHAVIOR; MICROSTRUCTURE; ALLOY;

D O I：

10.1016/j.jnucmat.2017.01.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Iron aluminide coating layers were formed on a ferritic martensitic grade 9Cr-1Mo (P 91) steel using pack aluminizing process. The formation of different aluminide compositions such as orthorhombic-Fe2Al5, B2-FeAl and A2-Fe(Al) on the pack chemistry and heat treatment conditions have been established. About 4-6 mu m thick Al2O3 scale was formed on the FeAl phase by controlled heat treatment. The corrosion tests were conducted using both the FeAl and Al2O3/FeAl coated specimens in an electromagnetic pump driven Pb-17Li Loop at 500 degrees C for 5000 h maintaining a flow velocity of 1.5 m/s. The detailed characterization studies using scanning electron microscopy, back-scattered electron imaging and energy dispersive spectrometry revealed no deterioration of the coating layers after the corrosion tests. Self-healing oxides were formed at the cracks generated in the aluminide layers during thermal cycling and protected the base alloy (steel) from any kind of elemental dissolution or microstructural degradation. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：60 / 65

页数：6

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