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← ScienceWhich outcome weakens oxide layers during high-temperature chlorination?
A)Accelerated grain boundary ionic diffusion✓
B)Increased cathodic polarization resistance
C)Formation of volatile metal chlorides
D)Decreased chloride ion adsorption energy
💡 Explanation
Increased temperatures cause accelerated grain boundary ionic diffusion because of higher thermal energy enhances ion mobility, weakening the passive oxide layer; therefore, metal ions diffuse rapidly. This diffusion, rather than volatility, accelerates corrosion within the layer at high temperatures.
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