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51315-6126-Repassivation Behavior of Alloy 22 in Chloride-Containing Solutions

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Product Number: 51315-6126-SG
ISBN: 6126 2015 CP
Author: Hundal Jung
Publication Date: 2015
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To evaluatesusceptibility to sulfur-enhanced corrosion repassivation behavior of Alloy 22 was investigated in sulfur-containing chloride solutionsusing a scratch technique.Once passive film wasdisrupted by scratchinganodic current increased abruptly to the peak current and thereafter decreased. Forpotential increasepeak current increasedand thickness of the reformed passive film increased with potential. The addition of 0.01M Na2S yielded nearly identical results as the sulfur-free cases. In simulated concentrated water containing 0.01 M Na2S repassivation commenced immediately after scratching. However an increase of the concentration to 0.1M Na2Sat 22 °C orincrease of temperature to 60 °C causes a decrease ofpeak current.Results indicatedthat Alloy 22 can repassivate in a relatively short period in sulfur?containing solutions.
To evaluatesusceptibility to sulfur-enhanced corrosion repassivation behavior of Alloy 22 was investigated in sulfur-containing chloride solutionsusing a scratch technique.Once passive film wasdisrupted by scratchinganodic current increased abruptly to the peak current and thereafter decreased. Forpotential increasepeak current increasedand thickness of the reformed passive film increased with potential. The addition of 0.01M Na2S yielded nearly identical results as the sulfur-free cases. In simulated concentrated water containing 0.01 M Na2S repassivation commenced immediately after scratching. However an increase of the concentration to 0.1M Na2Sat 22 °C orincrease of temperature to 60 °C causes a decrease ofpeak current.Results indicatedthat Alloy 22 can repassivate in a relatively short period in sulfur?containing solutions.
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