期刊
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
卷 57, 期 -, 页码 70-77出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2016.02.009
关键词
Cemented carbide; WC grain size; Electrochemical corrosion behavior; Aggressive medium; Corrosion mechanism; Equivalent circuit
资金
- National Natural Science Foundation of China [51574292]
- graduate student innovation projects of Central South University [2015zzts027]
The electrochemical corrosion behaviors of straight WC-10Co cemented carbides with grain sizes of 1.2, 2.6, 6.1 and 82 mu m, were comparatively investigated in the solutions of NaOH (pH = 13), Na2SO4 (pH = 7) and H2SO4 (pH = 1) respectively. To insure a sole variable of WC grain sizes, specific magnetic saturation values of the alloys are adjusted to be identical. The results show a good linear dependence for R-ct (charge transfer resistance) and I-corr (corrosion current density) against the grain sizes. A high sensitivity of the grain sizes to both R-ct and I-corr are identified in NaOH and H2SO4. In the solutions of NaOH and Na2SO4, the alloys with smaller WC grain sizes exhibit better corrosion resistances, while the alloys with larger WC grain sizes exhibit better corrosion resistances in H2SO4. Additionally, in terms of the corrosiveness, NaOH is the weakest and H2SO4 is the most aggressive for all the alloys. The corrosion mechanisms were discussed in light of the SEM surface observation, X-ray photoelectron spectroscope analysis and the electrical equivalent circuits for electrochemical impedance spectroscopy. (C) 2016 Elsevier Ltd. All rights reserved.
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