Basu, D K and Bhattacharjee, A K and Singh, M N (2000) Some observations on environmental corrosion behaviour and electrochemical passivation characteristic of silver-cadmium contact alloys in neutral - saline and alkaline - sour media. Journal of Metallurgy and materials Science., 42 (2). pp. 121-131.
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The atmospheric/environmental corrosion tests conducted on two different contact-alloys, Ag-Cd and Ag-CdO, revealed the following order with regard to variation in corrosion rate. Ag-CdO in M.A. > Ag-Cd in M.A> Ag-CdO in LA> Ag-Cd in LA. where, M.A. = Marine Atmosphere LA = Industrial Atmosphere The electrochemical polarisation measurements conducted on these materials (Ag-Cd & Ag-CdO) seperately in 3.5% NaCI and in 1% Na,S solutions, under fully immersed condition, exhibited the following order in respect of variation in corrosion current density. Ag-Cd in N.S.> Ag-CdO in N.S.> Ag-CdO in AS.> Ag-Cd in A.S. where, N.S. = Neutral-saline solution (3.5% NaCI solution). A.S. = Alkaline-sour solution (I%Na2S solution). The electrochemical passivation characteristic of these alloys in 3.5% NaCI and in 1% Na,S solutions whre also investigated. The present investigation reflects a similar variation trend for both iQ and icril' as given below: Ag-Cd in N.S.> Ag-CdO in N.S.> Ag-CdO in A.S.> Ag-Cd in A.S. where, iQ = Anodic current density corresponding to the initiation (point "Q" in the polarisation diagram) of passive-film damage. icrit = Critical current density corresponding to the nose (point "P" of the polarisation curve) of the primary - passivation peak. The experimental findings have also been interpreted in accordance with the electrochemical redox e.m.f., considerations.
|Uncontrolled Keywords:||Marine; Environmental corrosion; Contact-alloys; Corrosion behaviour; Passivation; Sour media|
|Divisions:||Corrosion and Surface Engineering|
|Deposited By:||Sahu A K|
|Deposited On:||19 Aug 2010 16:30|
|Last Modified:||23 Apr 2012 14:34|
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