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02395 CHARACTERIZATION OF ADMIRALTY BRASS OXIDE FILMS FORMED IN LP FEEDWATER ENVIRONMENTS UNDER TRANSIENT CONDITIONS

Picture for 02395 CHARACTERIZATION OF ADMIRALTY BRASS OXIDE...
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Product Number: 51300-02395-SG
ISBN: 02395 2002 CP
Author: T. Carvalho, W. F. Bogaerts, J. Hubrecht, B. Dooley and B. C. Syrett
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During normal boiler operation, the copper alloy surfaces of heat exchanger tubes develop a thin protective layer of cuprous oxide (Cu20), which retards further oxidation of the base metal. However, these layers slowly become thicker. Corrosion in the condensate/feedwater system produces both dissolved metal ions and metal particles, which are transported into the boiler. There, the copper can be incorporated into the steam and be transported to the turbine where it can be deposited on the blades as the pressure decreases. Start-ups and shutdowns or other upsets to normal boiler operation cause additional deposition. This will decrease heat transfer in different parts of the boiler and lead to loss of efficiency in the turbines. One solution to this problem is to chemically clean the turbine and the boiler, which involves expensive down time, loss of turbine generating capacity, or extension of the unit overhaul period. Different plant operating conditions were simulated in a flow-through loop, with continuous control of the water chemistry and with continuous monitoring of changes in corrosion behavior of admiralty brass. Oxides were characterized and film formation mechanisms were investigated under different operating regimes such as upset to, and recovery from, oxidizing conditions. It was shown that the observed differences in corrosion or metal release rates correlate with physical or electrochemical differences of the surface layers formed on admiralty brass under upset and recovery conditions. Keywords: admiralty brass, oxidation-reduction potential, electrochemical corrosion potential, corrosion monitoring, reducing agents concentration, dissolved oxygen concentration, oxide layer.
During normal boiler operation, the copper alloy surfaces of heat exchanger tubes develop a thin protective layer of cuprous oxide (Cu20), which retards further oxidation of the base metal. However, these layers slowly become thicker. Corrosion in the condensate/feedwater system produces both dissolved metal ions and metal particles, which are transported into the boiler. There, the copper can be incorporated into the steam and be transported to the turbine where it can be deposited on the blades as the pressure decreases. Start-ups and shutdowns or other upsets to normal boiler operation cause additional deposition. This will decrease heat transfer in different parts of the boiler and lead to loss of efficiency in the turbines. One solution to this problem is to chemically clean the turbine and the boiler, which involves expensive down time, loss of turbine generating capacity, or extension of the unit overhaul period. Different plant operating conditions were simulated in a flow-through loop, with continuous control of the water chemistry and with continuous monitoring of changes in corrosion behavior of admiralty brass. Oxides were characterized and film formation mechanisms were investigated under different operating regimes such as upset to, and recovery from, oxidizing conditions. It was shown that the observed differences in corrosion or metal release rates correlate with physical or electrochemical differences of the surface layers formed on admiralty brass under upset and recovery conditions. Keywords: admiralty brass, oxidation-reduction potential, electrochemical corrosion potential, corrosion monitoring, reducing agents concentration, dissolved oxygen concentration, oxide layer.
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