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The purpose of this paper is to examine the passive layer on 1050A aluminium alloy in non‐stationary conditions of linearly raised and lowered temperatures by means of dynamic electrochemistry impedance spectroscopy (DEIS).

The oxide passive layer on aluminium was examined using DEIS under non‐stationary conditions of linearly raised and lowered temperatures. In total, five heating‐cooling cycles were performed.

A significant change of impedance was observed only during the first cycle, which was called the forming one. During the subsequent cycles, the impedance of the system changed in a reversible manner.

The analysis using a equivalent circuit allowed us to determine a change of electric parameters of the circuit in the temperature function. Obtained changes of the electric parameters were correlated with layer structure.