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首页> 美国政府科技报告 >Coolant compatibility studies. The effects of irradiation and radiolysis on the aqueous corrosion of high chromium martensitic steels. Final report MANET 4
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Coolant compatibility studies. The effects of irradiation and radiolysis on the aqueous corrosion of high chromium martensitic steels. Final report MANET 4

机译：冷却剂兼容性研究。辐照和辐射分解对高铬马氏体钢水腐蚀的影响。最终报告maNET 4

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The aqueous corrosion behaviour of commercial (MANET-type steel and welds) and reduced activation high chromium martensitic steels has been investigated following exposure for times up to about 5000 hours in hydrogenated water at 275 degrees C and 90 bar pressure in the core, above core and out-of-core regions of the high pressure water loop in the Studsvik R2 reactor. The corrosion was evaluated by weighing the coupons before and after exposure, after ultrasonic cleaning to remove loose crud deposits, and after descaling; the surface deposits and oxide scale were also examined visually and by scanning electron microscopy and energy dispersive spectrometric analysis. The magnitudes of the corrosion (loss of iron into the water (weight reduction) and the associated formation of an Fe-Cr spinel-oxide) of the coupons exposed in the out-of-core region of the loop followed a(time)(sup 0.4) relationship, with the corrosion being slightly greater for the MANET-type compared to the reduced activation steels. The corrosion behaviour of the steels exposed in the core and above core regions of the loop, particularly the former, was seriously affected by heavy surface crud deposits. However, the data clearly demonstrate that the corrosion was highest for the steels tested in the core region, intermediate in the above core region and lowest in the out-of-core region of the loop. The factors responsible for the observed differences in the aqueous corrosion of the steels are discussed and recommendations are made for further investigations to clarify some of the present uncertainties. 11 refs. (Atomindex citation 25:068661)

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