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51317--9749-Corrosion Resistance of Alloys in Calcium Bromide and Calcium Chloride Solutions

Calcium bromide is used in the coal fire power plant industry to help control mercury emissions. The objective of this study was to determine the effect of bromide additions in chloride-rich Wet Flue Gas Desulfurization slurries on the crevice corrosion resistance of commercially-available corrosion resistant alloys.

Product Number: 51317--9749-SG
ISBN: 9749 2017 CP
Author: Brett Tossey
Publication Date: 2017
Industry: Energy Generation
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Calcium bromide is used within the coal fire power plant industry to assist with controlling mercury emissions. A direct consequence of adding bromide ions to the flue gas is that the total halide ion content of the Wet Flue Gas Desulfurization (WFGD) slurry increases. The objective of this study was to determine the effect of bromide additions in chloride-rich WFDG slurries on the crevice corrosion resistance of commercially-available corrosion resistant alloys. A laboratory study employed cyclic potentiodynamic polarization (CPP) methods to compare the performance of three different alloys in model solutions with varying concentrations of calcium chloride calcium bromide and a mixture of calcium chloride and calcium bromide. The alloys had pitting resistance equivalent numbers of 35 44 and 66. Three factors from the CPP tests were assessed: the open circuit potential the breakdown potential and the repassivation potential.A multi-variable regression analysis was performed to help reveal the statistically significant relationship(s) between open circuit potential the breakdown potential the repassivation potential and the total halide ion concentration.

Key words:  calcium bromide, coal, mercury emissions, WFGD, CRA 

Calcium bromide is used within the coal fire power plant industry to assist with controlling mercury emissions. A direct consequence of adding bromide ions to the flue gas is that the total halide ion content of the Wet Flue Gas Desulfurization (WFGD) slurry increases. The objective of this study was to determine the effect of bromide additions in chloride-rich WFDG slurries on the crevice corrosion resistance of commercially-available corrosion resistant alloys. A laboratory study employed cyclic potentiodynamic polarization (CPP) methods to compare the performance of three different alloys in model solutions with varying concentrations of calcium chloride calcium bromide and a mixture of calcium chloride and calcium bromide. The alloys had pitting resistance equivalent numbers of 35 44 and 66. Three factors from the CPP tests were assessed: the open circuit potential the breakdown potential and the repassivation potential.A multi-variable regression analysis was performed to help reveal the statistically significant relationship(s) between open circuit potential the breakdown potential the repassivation potential and the total halide ion concentration.

Key words:  calcium bromide, coal, mercury emissions, WFGD, CRA 

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