Abstract
The open-circuit behaviour of the anodic oxide film on titanium was studied in sulphuric acid and sodium hydroxide solutions by impedance and potential measurements. It was found that the film dissolves in sodium hydroxide and to a lesser extent in sulphuric acid. In both cases the measured capacitance, Cm, increases with time, t, according to Cm −1 = α – βt½ where α and β are coefficients dependent on the test solution. Thefilm was found to be duplex in nature. The outer layer is more defective than the inner one and therefore it is more susceptible to dissolution in both H2SO4 and NaOH.
Get full access to this article
View all access options for this article.
References
1.
El-Basiouny
M. S.
, Hassan, S. A., & Hefny, M. M. , Corros. Sci. , 1980 , 20, 909
2.
El-Basiouny
M. S.
, Bekheet, A. M., & Hefny, M. M. , Corrosion , 1979 , 35, 566
3.
Wood
G. C.
, &
Pearson
C.
Corros. Sci. , 1967 , 7 , 119
4.
Vijh
A. K.
, J. electrochem. Soc. , 1969 , 116 , 872
5.
Clark
R. I. H.
, ‘Comprehensive Inorganic Chemistry’ , 1973 , Vol. 3 , Chap. 32 (Oxford : Pergamon Press )
6.
Antonov
S. P.
,
Zosimovich
D. P.
, &
Stephanenko
V. G.
Korros. Zashch. metallov , 1972 , 88 –92 (CA. , Vol. 78 , 78831 b )
7.
Mansfeld
F.
, &
Florain
I.
J. electrochem. Soc. , 1973 , 120 , 188
8.
Tomashov
N. D.
,
Chernova
G. P.
,
Yu
Ruscol
S., & Ayuyan, G. A. , Electrochim. Acta , 1974 , 19 , 159
9.
Petit
J. A.
,
Chatainier
G.
, &
Dabosi
F.
Corros. Sci. , 1981 , 21 , 279
10.
Kader
Abd El
,
Abd
J. M.
El Wahab
F. M.
,
El Shayeb
H. A.
& Khedr, M. G. A., Br . Corros. J. , 1981 , 16 , 111
11.
El-Basiouny
M. S.
, El-Kot, A. M., & Hefny, M. M. , ibid. , 1979 , 14 , 51
12.
El-Basiouny
M. S.
, Ninan, M. M., & Gadallah, A. G. , J. electroanal. Chem. , 1979 , 105, 377
13.
Breiter
M. W.
, Electrochim. Acta. , 1970 , 15 , 1 –195
14.
Baitalov
D. A.
, &
Faizullin
F. F.
Uchen. Zap. kazan. gos. Univ. , 1964 , 124 , 31
15.
Faizullin
F. F.
, &
Baitalov
D. A.
Zashch. metallov , 1966 , 2,439 and 1968 , 4, 11
16.
Moussa
A. A.
,
Radwan
E. A.
, &
Ghaly
H. A.
Electrochim. Acta. , 1971 , 16 , 1369
17.
Engell
H. J.
, ibid. , 1977 , 22 , 987
18.
Pourbaix
M.
, ‘Atlas of Electrochemical Equilibria in Aqueous Solutions’ , 1966 , p. 213 (Oxford : Pergamon Press )
19.
Gatos
H. C.
, ‘The Surface Chemistry of Metals and Semi-Conductors’ , 1965 , pp. 382 & 460 (New York & London : Wiley )
20.
Young
L.
, ‘Anodic Oxide Films’ , 1961 , p. 171 (London & New York : Academic Press )
21.
Vermilyea
D. A.
, Acta metall . 1954 , 2 , 482
22.
Baitalov
D. A.
, &
Faizullin
F. F.
Estestv. Khim. , 1966 , p. 100 –121 (CA. , Vol. 68 , 26334 r) 1966, 2,38
23.
Vijh
A. K:
, Corros. Sci. , 1972 , 12, 105