Corrosion behaviour of an alloy formed by inductive melting of a cobalt-based alloy and AISI 4140 steel

被引：13
作者：
Chang, J. H. [1 ]
Chou, J. M. [1 ]
Hsieh, R. I.
Lee, J. L.
机构：
[1] Univ I SHOU, Dept Mat Sci & Engn, Dashu Township 84001, Kaohsiung Cty, Taiwan
来源：
CORROSION SCIENCE | 2009年 / 51卷 / 05期
关键词：
Co-based alloy; Bimetal; Induction melting; Acid corrosion; ANODIC POLARIZATION; CERMET COATINGS; WC-CO; CEMENTED CARBIDES; ENVIRONMENT; HARDMETALS; BINDERS; METALS; WEAR; FE;
D O I：
10.1016/j.corsci.2009.02.013
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A bimetal of Co-based alloy/AISI 4140 steel was fabricated by induction melting. The microstructure of the Co-based alloy was examined and the influence of on the alloy of acid solutions, the temperature of these solutions, and the immersion time was investigated. The results show that the microstructure of Co-based alloy consisted of a Co-rich phase, a Cr-rich phase, and W3CoB3. In a solution of 20% HCl and 6% FeCl3, the Co-rich phase was attacked to form porous channels but transformed to a Si-rich passivation film to prevent further attack in the solution of 72% H2SO4. Therefore, the relative corrosion resistance of Co-based alloy to acid solution is 72% H2SO4 > 20% HCl > 6% FeCl3 (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：987 / 996
页数：10
相关论文
共 21 条
[1]  
[Anonymous], 1995, Standard Practice for Laboratory Immersion Corrosion Testing of Metals
[2]  
BERNSTEIN PJ, 1991, Patent No. 2037297
[3]  
BIRKS N, 1983, INTRO HIGH TEMPERATU, P17
[4]   Corrosion behavior of thermal sprayed WC cermet coatings having various metallic binders in strong acidic environment [J].
Cho, JE ;
Hwang, SY ;
Kim, KY .
SURFACE & COATINGS TECHNOLOGY, 2006, 200 (08) :2653-2662
[5]  
CHOU SF, 1991, Patent No. 5185162
[6]  
CHOU SF, 1990, Patent No. 5019459
[7]  
HACK HP, 1992, ASM METALS HDB, V13, P521
[8]   Analytical characterization of the corrosion mechanisms of WC-Co by electrochemical methods and inductively coupled plasma mass spectroscopy [J].
Hochstrasser-Kurz, S. ;
Mueller, Y. ;
Latkoczy, C. ;
Virtanen, S. ;
Schmutz, P. .
CORROSION SCIENCE, 2007, 49 (04) :2002-2020
[9]   Investigation of the specific adsorption of HSO4- (SO42-) and Cl- ions on Co and Fe by radiotracer technique in the course of corrosion of the metals in perchlorate media [J].
Horányi, G .
CORROSION SCIENCE, 2004, 46 (07) :1741-1749
[10]   Electrochemical behaviour of tungsten-carbide hardmetals [J].
Human, AM ;
Exner, HE .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1996, 209 (1-2) :180-191
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