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Effect of irradiation lines on metal electrode potential

2026-07-13View Original

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The core effect of irradiation lines on the potential of metal electrodes is that in most cases the potential shifts forward. The specific rules and mechanisms are as follows: The core change rule is that in conventional aqueous solution systems, irradiation will significantly increase the oxidation of the solution, and the electrode potential of most metals will move in the positive direction. For example, the steady-state potential of 304L stainless steel can increase by 200~300mV under gamma irradiation, reaching about +320 mV (SCE). Different materials have different offset amplitudes. For example, the potential of 1Cr18Ni9Ti steel can move forward by 100~150mV after being irradiated by neutrons. Main mechanism of action media radiolysis effect: Irradiation decomposes water to generate oxidative products such as ·OH, H₂O₂, and O₂. The potential rises through cathode depolarization. After the irradiation is stopped, the short-lived free radicals disappear and the potential will partially fall back. Surface membrane regulatory effect: If the metal surface is covered with an n-type semiconductor oxide film, irradiation will accelerate the anodic reaction and shift the potential negatively. ; If it is a p-type semiconductor oxide film, irradiation will accelerate the cathode reaction and shift the potential positively. Key influencing factors: The direction and amplitude of potential shift are controlled by multiple factors such as irradiation intensity, electrode material, and solution composition.: The hydrogen environment can inhibit the positive shift of the potential, and solute ions such as Fe²⁺ and Cl⁻ will also change the process and final value of the potential change.

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