Abstract
Open-circuit potential and galvanostatic polarisation measurements were made on tungsten in alkaline phosphate solutions. The rate of anodic dissolution of tungsten strongly depended on pH and showed a Tafel slope of 60 mV/decade. The reaction order with respect to OH− was found to be 1. An increase of temperature at constant pH increased the dissolution rate of tungsten, and the activation energy. ∆H*, for the dissolution process wasfound to be 125 kJ/mol.
Get full access to this article
View all access options for this article.
References
1.
El-Basiouny
M. S.
, & Haruyama, S. , Corros. Set. , 1977 , 17, 405
2.
El-Basiouny
M. S.
,
Hassan
S. A.
, &
Hefny
M. M.
ibid. , 1980 , 20, 909
3.
Koerner
W. E.
, J. electrochem. Soc. , 1917 , 31 , 22
4.
Th
Heumann
, &
Stolica
N.
Electrochim. Acta , 1971 , 16 , 1635
5.
Armstrong
R. D.
,
Edmondson
K.
, &
Firma
R. E.
J. electroanal. Chem. , 1972 , 40 , 19
6.
Ammar
I. A.
,
Darwish
S.
, &
Salim
R.
Metalloberfläche , 1975 , 29 , 395
7.
El-Basiouny
M. S.
, J. electroanal. Chem. , 1978 , 94, 39
8.
Heslop
R. B.
, &
Robinson
P. L.
‘Inorganic Chemistry : A Guide to Advanced Study ’, 1967 . p. 667 (London : Elsevier Publishing Co .)
9.
Wagner
C.
, & Traud, W. , Z. Elektrochem. , 1938 , 44, 391
10.
Butler
G.
,
Francis
P. E.
, &
McKie
A. S.
Corros. Set. , 1969 , 9 , 715
11.
Besson
J.
, &
Drautzburg
G.
Electrochim. Ada , 1960 , 3 , 158
12.
Sukhotin
A. M.
,
Antonovskaya
E. I.
, &
Pozdeeva
A. A.
Zh. fiz. Khim. , 1962 , 36 , 2368