Materials being considered for use in, or to contain, aqueous media in high-pressure steam plants or water-cooled nuclear reactor plant systems require a measure of their resistance to general corrosion under the anticipated environmental conditions. Laboratory data are usually obtained by exposing test materials to simulated environmental conditions for various lengths of time. The general methods used for testing may be similar, but techniques and procedures usually vary widely. The lack of standardized test methods for high-temperature water corrosion testing results in data that are not always comparable or that are of limited use because of differences in testing techniques, methods of analysis, or deficiencies in the reporting of results.
This lack of uniformity in corrosion testing prompted NACE Unit Committee T-7D on High Purity and Power Plant Water to make this standard test method available to increase the utility and reliability of high-temperature aqueous corrosion data. The standard is also intended to aid users of such data by indicating how the data were obtained and the possible limitations for application to selection of materials or environmental conditions for high-temperature water systems.
The method described herein is intended primarily for the evaluation of metals used for structural components and for containment of aqueous solutions. The method does not apply to the testing of metals used for cladding fissionable materials or for neutron-absorbing materials in water-cooled nuclear reactors. Paragraph 1.5 lists other limitations of this standard.
This standard was originally published in 1971 and was revised in 1995 by NACE Unit Committee T-7H on Corrosion and Its Control in Steam-Generating Systems. It is issued by NACE International under the auspices of Group Committee T-7 on Corrosion by Waters.
1.1 This standard establishes a laboratory test method for determining the extent and rate of corrosion of metals in high-temperature water at temperatures greater than 100°C (212°F) but less than approximately 360°C (6B0°F).
1.2 The data obtained are intended to provide a quantitative measure of the general corrosion resistance of metallic materials being used or being considered for use in high-purity water systems.
1.3 This test method is intended to standardize laboratory test procedures and to aid in evaluating the general corrosion behavior of metallic materials in high-temperature water systems.
1 .4 The method described herein is directed principally to the evaluation of metals normally used for containment of structural components in high-pressure, high-temperature water systems.
Historical Document 1995