Studies on newer chemical passivation treatment for stainless steel
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
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Title |
Studies on newer chemical passivation treatment for stainless steel
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Creator |
Marikannu, C.
Sathiyanarayanan, S. Venkatachari, G. |
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Subject |
Corrosion Science and Engineering
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Description |
An attempt has been made to develop a chemical passivation treatment for AISI 304 stainless
steel based on nitric acid in the presence of various oxidising agents such as sodium molybdate,
potassium dichromate and potassium permanganate. The stability of the passive film formed
through different chemical passivation treatments has been studied by potential–time measurement
in 0.5 M sulphuric acid and the operating parameters of chemical passivation have also
been optimised by this technique. Results of the study show that chemical passivation of stainless
steel in nitric acid shifts the open circuit potential in the positive direction. Increase of
concentration of nitric acid, treatment time and temperature further ennobles the potential.
Addition of either dichromate or permanganate ions to nitric acid helps in forming a more stable
passive film whereas molybdate, even at higher concentrations does not have any beneficial
effect on passive film formation.
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Publisher |
Maney Publishing
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Date |
2005
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Type |
Article
PeerReviewed |
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Format |
application/pdf
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Identifier |
http://cecri.csircentral.net/226/1/117-2005.pdf
Marikannu, C. and Sathiyanarayanan, S. and Venkatachari, G. (2005) Studies on newer chemical passivation treatment for stainless steel. Transactions of the Institute of Metal Finishing, 83 (3). pp. 158-160. ISSN 0020-2967 |
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Relation |
http://cecri.csircentral.net/226/
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