Effects of Zn injection into boric acid and lithium hydroxide solutions on the corrosion behaviors of 316LN stainless steel in simulated hot functional test high-temperature pressurized water

The effects of Zn injection into boric acid and lithium hydroxide solutions on the corrosion behaviors of 316LN stainless steel (SS) in simulated hot functional test (HFT) high-temperature pressurized water at 573 K were investigated. Low concentration of lithium hydroxide solutions with 20-100 ppb Zn injection are recommended for Zn-injected HFT water chemistry and the beneficial effects of Zn injection into both HFT and primary coolant water chemistry are confirmed in view of the protective properties of the oxide films on 316LN SS. The Zn in-jection involved corrosion mechanism during HFT is discussed.

Automated summary

The effects of Zn injection into boric acid and lithium hydroxide solutions on the corrosion behaviors of 316LN stainless steel in simulated high-temperature pressurized water were examined. It was recommended to use low concentration of lithium hydroxide solutions with 20-100 ppb Zn injection for Zn-injected water chemistry in high-temperature pressurized water environment. The study confirmed the beneficial effects of Zn injection in terms of protecting the oxide films on 316LN stainless steel, both in the hot functional test and primary coolant water chemistry. The corrosion mechanism during the Zn injection in high-temperature pressurized water was also discussed.