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首页> 外文期刊>Journal of Materials Engineering and Performance >Corrosion Behavior of Alloy 625 in Simulated Nuclear High-Level Waste Medium
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Corrosion Behavior of Alloy 625 in Simulated Nuclear High-Level Waste Medium

机译：625合金在模拟核高级废料中的腐蚀行为

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摘要

The present investigation aims to study the effect of various ions present in nuclear high-level waste (HLW) (acidic) medium on the corrosion resistance of Alloy 625, with solution-annealed and sensitized microstructure. The heat-affected zones are prone to sensitization during welding of components and subsequent exposure to acidic waste during service could result in intergranular corrosion in these regions and hence it was attempted to study the corrosion behavior of the alloy under sensitized conditions. Double loop electrochemical potentiokinetic reactivation test was carried out to obtain the extent of chromium depletion. Potentiodynamic anodic polarization and electrochemical noise investigations were carried out on Alloy 625 in 3 M nitric acid and simulated nuclear HLW medium (prepared in 3 M nitric acid) at 298 K and 323 K. The study showed that the alloy possess good corrosion resistance in 3 M nitric acid and simulated HLW medium. However, a marginal decrease in the corrosion resistance occurred in simulated HLW when compared to the plain acid, as observed from an increase in passivation current density, decrease in transpassive potentials, and decrease in electrochemical noise resistance. Increase in temperature of the medium and change in microstructure from solution-annealed to sensitized state further decreased the corrosion resistance of Alloy 625. Electrochemical noise time records obtained at open circuit conditions showed a stable passive film for 22 h of immersion of the alloy in 3 M nitric acid and simulated HLW. However, the amplitude of current fluctuations was higher for the sensitized microstructure when compared to the solution-annealed microstructure.
机译：本研究旨在通过溶液退火和敏化的微观结构，研究核高级废料（HLW）（酸性）介质中存在的各种离子对625合金的耐腐蚀性的影响。受热影响的区域在部件焊接过程中易于致敏，随后在使用过程中暴露于酸性废物中可能导致这些区域发生晶间腐蚀，因此尝试研究在致敏条件下合金的腐蚀行为。进行双回路电化学电位动力学再活化试验，以测定铬的消耗程度。在3 M硝酸中和298 K和323 K的模拟核HLW介质（在3 M硝酸中制备）上对625合金进行了电位动力学阳极极化和电化学噪声研究。研究表明，该合金在3 K中具有良好的耐腐蚀性M硝酸和模拟的HLW介质。但是，与钝化酸相比，模拟HLW的耐蚀性略有下降，这是由于钝化电流密度的增加，穿越钝化电势的降低和耐电化学噪声性的降低所致。介质温度的升高和微观结构从固溶退火到敏化状态的变化进一步降低了625合金的耐蚀性。在开路条件下获得的电化学噪声时间记录显示，在将合金3浸入3小时后，形成了稳定的钝化膜M硝酸和模拟的HLW。但是，与溶液退火的微观结构相比，敏化微观结构的电流波动幅度更高。

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