Comparison of electrochemical corrosion between coarse-grained and fine-grained WC-Al2O3 composites in acidic and alkaline solutions

被引：9
作者：
Han, Bin [1 ]
Dong, Weiwei [1 ]
Bai, Yunfeng [1 ]
Ding, Hao [1 ]
Zhu, Shigen [1 ,2 ]
机构：
[1] Donghua Univ, Coll Mech Engn, Shanghai 201620, Peoples R China
[2] Minist Educ, Engn Res Ctr Adv Text Machinery, Shanghai 201620, Peoples R China
来源：
MATERIALS LETTERS | 2021年 / 305卷
关键词：
WC-Al2O3; composite; Sintering; Ceramic; Corrosion; Grain size; HARDMETALS; BEHAVIOR;
D O I：
10.1016/j.matlet.2021.130732
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Coarse-grained and fine-grained WC-Al2O3 composites were prepared by adjusting sintering process. The grain sizes of the coarse-grained and fine-grained composite are 4.29 mu m and 3.14 mu m, respectively. The effect of grain size on the corrosion properties of WC-Al2O3 composites in acidic and alkaline solutions was studied by electrochemical technology. Compared with fine-grained composite, coarse-grained composite has higher corrosion potential, higher total resistance and lower corrosion current density. Therefore, it can be concluded that the fine-grained composite exhibits poor corrosion resistance in acidic and alkaline solutions. The poor corrosion resistance of fine-grained composite is mainly due to more grain boundaries, which accelerates the corrosion of composite at the initial stage.
引用
收藏
页数：5
相关论文
共 15 条
[1]   Improved corrosion resistance of air plasma sprayed WC-12%Co cermet coating by laser re-melting process [J].
Deen, K. M. ;
Afzal, M. ;
Liu, Y. ;
Farooq, A. ;
Ahmad, A. ;
Asselin, E. .
MATERIALS LETTERS, 2017, 191 :34-37
[2]   Corrosion behaviour of WC hardmetals with nickel-based binders [J].
Ferro Rocha, A. M. ;
Bastos, A. C. ;
Cardoso, J. P. ;
Rodrigues, F. ;
Fernandes, C. M. ;
Soares, E. ;
Sacramento, J. ;
Senos, A. M. R. ;
Ferreira, M. G. S. .
CORROSION SCIENCE, 2019, 147 :384-393
[3]   The relationship between electrochemical behaviour and in-service corrosion of WC based cemented carbides [J].
Human, AM ;
Exner, HE .
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, 1997, 15 (1-3) :65-71
[4]   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
[5]   Effect of WC grain size on the corrosion behavior of WC-Co based hardmetals in alkaline solutions [J].
Kellner, F. J. J. ;
Hildebrand, H. ;
Virtanen, S. .
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, 2009, 27 (04) :806-812
[6]   Hardmetals with nanograin reinforced binder: Binder fine structure and hardness [J].
Konyashin, I. ;
Ries, B. ;
Lachmann, F. ;
Cooper, R. ;
Mazilkin, A. ;
Straumal, B. ;
Aretz, A. ;
Babaev, V. .
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, 2008, 26 (06) :583-588
[7]   Contact angles of WC/WC grain boundaries with binder in cemented carbides with various carbon content [J].
Konyashin, I. ;
Straumal, B. B. ;
Ries, B. ;
Bulatov, M. F. ;
Kolesnikova, K. I. .
MATERIALS LETTERS, 2017, 196 :1-3
[8]   Microstructure and mechanical properties of hot-pressing sintered WC-x vol.%Al2O3 composites [J].
Qu, Haixai ;
Zhu, Shigen ;
Li, Qian ;
Ouyang, Chenxin .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2012, 543 :96-103
[9]   Influence of sintering temperature and holding time on the densification, phase transformation, microstructure and properties of hot pressing WC-40 vol.%Al2O3 composites [J].
Qu, Haixia ;
Zhu, Shigen ;
Li, Qian ;
Ouyang, Chenxin .
CERAMICS INTERNATIONAL, 2012, 38 (02) :1371-1380
[10]   Pseudopartial wetting of WC/WC grain boundaries in cemented carbides [J].
Straumal, B. B. ;
Konyashin, I. ;
Ries, B. ;
Straumal, A. B. ;
Mazilkin, A. A. ;
Kolesnikova, K. I. ;
Gusak, A. M. ;
Baretzky, B. .
MATERIALS LETTERS, 2015, 147 :105-108
12