求翻译：经48h 浸泡后，碳钢电极表面已形成了明显厚度的锈层，但此时交流阻抗的等效电路仍然无表征锈层的电阻元件Rrust，表明锈层不具备阻碍反应的作用.是什么意思？

After 48h immersion, the carbon electrode surface has formed a significant thickness of the rust layer, but this time the equivalent circuit impedance characterization is still no rust resistance element Rrust, that rust does not impede the reaction with the role.

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After the 48h immersion, the carbon steel electrode surface has formed the obvious thickness rust level, but the this time alternating-current impedance equivalent circuit still did not have the attribute rust level resistor Rrust, indicated the rust level did not have the hindrance response functio

48h immersion, carbon steel electrode has formed a significant thickness of rust layer on the surface, AC impedance equivalent circuit but still no characterization of resistance element of rust layers Rrust, indicating that without hindering effect of rust layer.

48h immersion, carbon steel electrode has formed a significant thickness of rust layer on the surface, AC impedance equivalent circuit but still no characterization of resistance element of rust layers Rrust, indicating that without hindering effect of rust layer.