Introduction Corrosion is a problem we always have to consider when dealing with metals in contact with natural waters and aqueous solutions. Surprisingly enough, most of the available information on aqueous corrosion is concerned with temperatures close to ambient in spite of the fact that most water used in domestic or industrial equipment is at elevated temperatures. Plant such as condensers, hot‐water systems, and steam raising equipment, where the temperature may vary from slightly above ambient up to and beyond the critical point of water at 373°C is included in this category. The methods of water treatment, operational procedures, and the choice of materials for higher temperatures have, in most cases, been arrived at either empirically from observations on actual installations, or by extrapolation of data obtained at lower temperatures. The latter can only be a rough guide, and may even be misleading. This has meant that corrosion has imposed limitations on the temperature and efficiency of operation of hot water systems and steam plant generally.
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