Abstract Magnetite deposition on the secondary side of steam generators is a major concern in nuclear power plants. Therefore, it is necessary to mitigate the deposition using optimized water chemistry control. The purpose of this study is to investigate the effects of three pH control agents, ammonia, morpholine, and ethanolamine, on the magnetite deposition onto an Alloy 690TT tube under conditions similar to operating steam generators. The deposited magnetite particles were polyhedral or spherical in shape and numerous micropores were clearly observed in the deposits regardless of pH agents. The amount of deposited magnetite was lowest when ammonia was used, and increased approximately 1.7 times and 2.6 times when using morpholine and ethanolamine, respectively. The effects of the pH agents were discussed based on the difference of zeta potentials between magnetite particles and the bare surface of the Alloy 690TT tube, particle size, and magnetite solubility.

中文翻译：

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pH控制剂对蒸汽发生器管上磁铁矿沉积的影响

摘要 蒸汽发生器二次侧的磁铁矿沉积是核电厂的一个主要问题。因此，有必要使用优化的水化学控制来减轻沉积。本研究的目的是研究三种 pH 控制剂，氨、吗啉和乙醇胺，在类似于运行蒸汽发生器的条件下，对合金 690TT 管上磁铁矿沉积的影响。沉积的磁铁矿颗粒呈多面体或球形，无论 pH 值如何，在沉积物中都可以清楚地观察到许多微孔。使用氨时沉积的磁铁矿量最低，使用吗啉和乙醇胺时分别增加约1.7倍和2.6倍。