T/CNS 14-2019 The method for testing gap corrosion of metal materials in high-temperature and high-pressure water of nuclear power plants

Scope

Scope: This standard specifies the method for gap corrosion testing of metal materials in nuclear power plants when they are immersed in high-temperature and high-pressure water and subjected to electrochemical testing. This standard applies to gap corrosion immersion tests of metal materials in water media at temperatures up to 360°C and pressures up to 20 MPa, or gap corrosion electrochemical experiments in water media at temperatures below 250°C. Main technical content: During the preparation of this section, reference was made to the national standards GB/T 10123-2001 "Basic Terms and Definitions for Corrosion of Metals and Alloys", GB/T 13671-1992 "Electrochemical Test Methods for Gap Corrosion of Stainless Steels", GB/T 24196-2009 "Electrochemical Test Methods for Corrosion of Metals and Alloys", and ASTM standard ASTM G48-03 (2009) "Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution". These standards provide methods for corrosion evaluation and gap corrosion testing of metal materials. Reference was also made to the technical documents on high-temperature and high-pressure water gap corrosion testing prepared by the Institute of Metal Research, Chinese Academy of Sciences, and the implementation experience of gap corrosion testing of nuclear power plant structural materials in high-temperature and high-pressure water accumulated by the Institute of Metal Research, Chinese Academy of Sciences.

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