Grain boundary corrosive agent for low-carbon nuclear pressure vessel steel after long-term high-temperature thermal aging as well as preparation method and use method of grain boundary corrosive agent

• Main Authors: BU HENGYONG, LI SHAOHONG, LI MENGNIE, LI JUN, JIA YUNFEI, GAO JUNKANG, LIU CHAOZE, YANG YINHUI, QI HUARONG
• Format: Patent
• Language: Chinese; English
• Published: 31.05.2024
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; METALLURGY; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25; NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; PHYSICS; TESTING

The invention relates to the technical field of metal materials, in particular to a preparation method and a use method of a crystal boundary corrosive agent for nuclear power pressure vessel steel after long-term high-temperature thermal aging, and the crystal boundary corrosive agent is composed of picric acid, deionized water and sodium dodecyl benzene sulfonate. The corrosive agent can directly corrode grain boundaries of polished steel for the nuclear power pressure vessel after thermal aging for different times after being corroded for about 3 minutes in an environment of 60-80 DEG C, and the measurement accuracy of grain size can be improved. The corrosion method provided by the invention can quickly, simply, clearly and completely display the original austenite grain boundary of the steel for the pressure vessel after thermal aging, and has the characteristics of simplicity and safety in operation and high corrosion efficiency. 本发明涉及金属材料技术领域，具体涉及一种快速、简便、清晰显示一种核电压力容器用钢长期高温热老化后的晶界腐蚀剂的制备方法和使用方法，所述晶界腐蚀剂由苦