Corrosion release behavior of alloy 690 and its application in high-temperature water with Zn injection

Corrosion release behavior of alloy 690 and its application in high-temperature water with Zn injection

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Corrosion release behavior of Alloy 690 in high-temperature water was investigated under the conditions of injected Zn concentrations of 0 ppb, 10 ppb and 50 ppb.A protective oxide film composed of Zn(FexCr1-x)2O4 and Cr2O3 was formed with Zn injection, PAL and Coaxial resulting in a better corrosion resistance.In comparison with the Zn-free condition, the corrosion release rate under the Zn-injection conditions was smaller.The corrosion release inhibiting factors were 1.

7 and 1.9 under the conditions of 10 ppb and 50 ppb Zn-injection respectively.A foreseen application of the corrosion and corrosion Wallet release rates has been proposed and discussed.