Corrosion Behavior of Nickel-Chromium-Iron Alloy 600 in Borated Pressurized Water Reactor Environments

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Abstract
Corrosion tests were run for periods up to 5000 hrs in borated water at 600 F (316 C) in a high velocity loop on strip, tubes, and weldments of Alloy 600. During the first 1000 to 2000 hrs of exposure, corrosion rate differences depending upon surface preparation and in the case of weld metal on composition were observed. However, by 3000 to 5000 hrs, the corrosion rates of all samples tested had decreased to around 1.0 mg/dm2 per month, or to rates of scale formation of about 1.4 mg/dm2 per month. Approximately half the scale was adherent, and half was lost to the stream. Comparison with earlier tests in borate—free water seemed to indicate that the addition of boric acid increased corrosion somewhat during the initial exposure periods, but this was a transient effect, and corrosion rates decreased with time.

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