Role of alkaline nitrites in the corrosion performance of steel in composite cements
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
View Archive Info| Field | Value | |
| Title |
Role of alkaline nitrites in the corrosion performance
of steel in composite cements
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| Creator |
Song, H.W.
Saraswathy, V. Muralidharan, S. Lee, C.H. Thangavel, K. |
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| Subject |
Corrosion Science and Engineering
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| Description |
The influence of alkaline nitrites on the inhibition
of corrosion of steel in binary and ternary cement
environments was tested. pH measurements carried out for
binary and ternary cement extracts showed that the alkalinity
of the cement was not affected by making use of
binary and ternary cements. Gravimetric measurements
showed that the decrease in the corrosion rate of steel in
different systems follows the order: Ternary [ (OPC +
PSC) [ (OPC + PPC) [ (PPC + PSC). Potential–time
studies indicated that the ability to maintain the passivity of
steel in different systems also follows the order as above.
Potentiodynamic polarisation studies for steel in binary and
ternary cement environments showed the favourable
influence of the presence of higher amounts of chlorides.
Nitrites of sodium, potassium and calcium act as anodic
inhibitors and they compete with chloride ions for the
ferrous ions at the steel to form a film of ferric oxide. An
efficiency as high as 91% is obtained for the ternary system
containing 1% chloride and 0.5% nitrite. The degree of
surface coverage showed a maximum value for the ternary
system ([0.9) even in the presence of a higher amount of
chloride thereby indicating the better performance of the
system.
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| Publisher |
Springer Verlag
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| Date |
2009
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cecri.csircentral.net/406/1/081-2009.pdf
Song, H.W. and Saraswathy, V. and Muralidharan, S. and Lee, C.H. and Thangavel, K. (2009) Role of alkaline nitrites in the corrosion performance of steel in composite cements. Journal of Applied Electrochemistry, 39 (1-2). pp. 45-53. ISSN 0021-891X |
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| Relation |
http://cecri.csircentral.net/406/
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