Galvanic corrosion between SiC monofilament and magnesium in NaCl, Na2SO4 and NaNO3 solutions for application to metal-matrix composites
1994; Elsevier BV; Volume: 36; Issue: 9 Linguagem: Inglês
10.1016/0010-938x(94)90055-8
ISSN1879-0496
AutoresLloyd H. Hihara, P.K. Kondepudi,
Tópico(s)Aluminum Alloys Composites Properties
ResumoGalvanic corrosion of SiC monofilament (MF) coupled to pure Mg and ZE41A Mg alloy was studied using the potentiodynamic polarization technique in concert with the mixed-potential theory. Corrosion penetration rates of Mg were generally equal to 1 cm year−1 in de-aerated and oxygenated 3.15% NaCl, 0.5 M Na2SO4 and 0.5 M NaNO3 solutions. Galvanic corrosion penetration rates varied from 0.046 to 7.3 cm year−1, depending on solution oxygenation and the exposed region of SiC MFs. NaF was very effective in reducing galvanic corrosion rates in de-aerated 0.5 M Na2SO4 and 0.5 M NaNO3, modestly effective in oxygenated 0.5 M Na2SO4 and 0.5 M NaNO3 and ineffective in 3.15% NaCl.
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