Inhibiters replacement of chilled water system in nuclear unit

Jianli Xie (Suzhou Nuclear Power Research Institute, Suzhou, China)
Jiayuan Hu (Zhejiang Electric Power Corporation Research Institute, Hangzhou, China)
Jundong Lu (Suzhou Nuclear Power Research Institute, Suzhou, China)
Xinmin Li (Suzhou Nuclear Power Research Institute, Suzhou, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Publication date: 5 June 2017

Abstract

Purpose

The purpose of this paper was to study the corrosion control of B10 copper-nickel alloy using the LiOH-N2H4 compound inhibitors and to evaluate the feasibility of replacing the original inhibitors (NaNO2-Na2MoO4) with the new ones (LiOH-N2H4) for the chilled water system in a nuclear unit.

Design/methodology/approach

The corrosion resistance performance of B10 copper-nickel alloy was evaluated during the whole replacement process of inhibiters using electrochemical tests and surface analysis techniques.

Findings

The results indicated that the corrosion of B10 copper-nickel alloy could be prevented effectively using LiOH to increase the pH value of solution higher than 10.0 and using N2H4 to consume dissolved oxygen. During the replacement process of inhibitors from NaNO2-Na2MoO4 to LiOH-N2H4, the corrosion resistance performance of B10 copper-nickel alloy had not decreased greatly. The new LiOH-N2H4 inhibitor, which could enhance the compactness of rust, was able to reduce the corrosion rate of rusted B10 metal.

Originality/value

It is feasible and operable to replace the NaNO2-Na2MoO4 inhibitors with the LiOH-N2H4 inhibitors for the corrosion prevention of B10 copper-nickel alloy. The research results can provide guidelines for the inhibitor selection of chilled water system in a nuclear unit.

Keywords

Citation

Xie, J., Hu, J., Lu, J. and Li, X. (2017), "Inhibiters replacement of chilled water system in nuclear unit", Anti-Corrosion Methods and Materials, Vol. 64 No. 4, pp. 418-423. https://doi.org/10.1108/ACMM-02-2016-1647

Publisher

:

Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited

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