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Electrochemical Techniques for Corrosion Rate Determination in Ceramics
Author(s) -
Divakar Ramesh,
Seshadri Srinvasa G.,
Srinivasan Makuteswarc
Publication year - 1989
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1989.tb06217.x
Subject(s) - corrosion , materials science , aqua regia , polarization (electrochemistry) , electrochemistry , ceramic , reagent , metallurgy , electrolyte , aqueous solution , chemistry , electrode , metal
Standard electrochemical test procedures have been successfully applied to determine the corrosion rates of SiC‐based ceramics in aqueous reagents. Direct‐current polarization measurements in HCI solutions indicate that the corrosion rate of α‐SiC is 0.0050 ± 0.0002 mil/yr and is fairly independent of HCI concentration. The corrosion rates of α‐SiC are significantly lower than those for reaction‐sintered SiC in all of the electrolytes used including HCI, HNO 3 , H 3 , H 3 PO 4 , and aqua regia. It is believed that the free Si contained in the reaction‐sintered SiC is responsible for the higher corrosion rates. It has been shown that electrochemical techniques are reproducible and eminently suitable for determining very low corrosion rates encountered in ceramics.