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| Research on General Corrosion Property of 304L Stainless Steel in Simulated PWR Primary Water |
| PENG Dequan, HU Shilin, ZHANG Pingzhu, WANG Hui |
| China Institute of Atomic Energy, Bejing 102413, China |
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Abstract The general corrosion behavior of 304L grade stainless steel in simulated pressurized water reactor (PWR) primary loop was studied using still autoclave, the corrosion test lasted for 1680 h. The corrosion oxide films were analyzed macroscopically and microscopically. The general corrosion and general corrosion rate of 304L stainless steel was quantitatively valued. Results showed that the oxide film was formed on the surface of 304L in 336 h. Oxide films were two sub-layers structure, the diameter of oxide particles near the metal substrate ranged from 50 to 100 nm, polygonal bigger oxide particles with diameter ranging from 0.5 to 1.6 μm were distributed on the small particles. After 1680 h experiment of high temperature and high pressure, the diameter of small particles near the metal substrate grew up to 80 to 250 nm, the bigger oxide particles grew up to 0.8~2.5 μm. The compact and small particle oxide film was very corrosion resistant. The weight gain rate of samples declined very much firstly, and then changed little. After 1680 h corrosion test, the general corrosion rate declined to only 2.85×10-3 mg/(dm2h).
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