Effects of Trace Elements on Corrosion in Total Immersion and under Wet/Dry Conditions

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Abstract
The effects of 13 trace elements in a base line solution that is considered to represent flue gas desulfurization environments have been studied by electrochemical measurements for five alloys that were totally immersed or immersed for 1 h/day. Polarization resistance and corrosion potential measurements were performed continuously for 10 electrodes per test solution over a 6-day period, resulting in approximately 600 measurements per test. A computerized system was used to store test data and analyze results. Very large differences in corrosion behavior were observed for the five alloys in a solution containing a given combination of trace elements and for a given alloy in solutions containing different combinations of trace elements. A statistical analysis has been performed to determine the trace elements that have significant effects on corrosion behavior.

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