Effect of polyacrylic acid on the corrosion behavior of Alloy 690 in pressurized water reactor secondary water

doi:10.1016/j.jmst.2024.09.011

Abstract

Abstract: The effect of polyacrylic acid (PAA) on the corrosion behavior of Alloy 690 in simulated pressurized water reactor secondary water was investigated. The duplex oxide film structure, consisting of a Ni-rich outer layer and a Cr-rich inner layer, was maintained regardless of PAA presence. PAA inhibited the growth of outer Ni-rich particles while promoting Cr enrichment in the inner layer and inducing its amorphization, both enhancing oxidation resistance. However, excess PAA (≥ 500 ppb) suppressed protective oxide formation during initial oxidation, leading to oxygen penetration into the matrix. A PAA concentration of around 250 ppb is considered optimal for steam generators, as it provides the benefits of PAA without adverse effects on the alloy.

Key words: Polyacrylic acid, Alloy 690, Pressurized water reactor, Secondary water, Oxide film

Zhiyuan Zhang, Zhiming Zhang, Jianqiu Wang, Hongliang Ming, Haipeng Zhu, Tichun Dan, Ruoyu Wang, Beibei Gao, En-Hou Han. Effect of polyacrylic acid on the corrosion behavior of Alloy 690 in pressurized water reactor secondary water[J]. J. Mater. Sci. Technol., 2025, 220: 1-13.

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