Method for detection of a phenomenon of oxidation of a porous metal anode of an electrochemical device, with the said device incorporating a porous cathode and an electrolyte positioned between the anode and the cathode, with the said method incorporating the application of an operating mode previously determined for the electrochemical device, consisting in feeding the anode with a reducing fuel, feeding the cathode with an oxidizer, and activating a mode of anionic conduction of the electrolyte, with the method also consisting in the following, during the application of the mode of operation of the electrochemical device: • applying (in 54) a first value of current between the anode and the cathode so as to obtain a constant voltage between the anode and the cathode; • then varying (in 54) the current applied between the anode and the cathode between the first value of current and a second value of current, so as to induce a first transient state of the voltage between the anode and the cathode; • applying (in 58) a third value of current between the anode and the cathode, so as to obtain a constant voltage between the anode and the cathode, with the third value of current being different from the first value of current; with the third value of current being close to the value of a limit current inducing the complete consumption of the fuel feeding the anode of an ideal device; with the first and third values of current presenting a difference of at least 5%; • then varying (in 58) the current applied between the anode and the cathode between the third value of current and a fourth value of current, so as to induce a second transient state of the voltage between the anode and the cathode; • comparing (in 60) the first and second transient states and detecting the occurrence of a phenomenon of oxidation of the anode if the first and second transient states differ from each other by more than a previously-determined value. • applying (in 54) a first value of current between the anode and the cathode so as to obtain a constant voltage between the anode and the cathode; • then varying (in 54) the current applied between the anode and the cathode between the first value of current and a second value of current, so as to induce a first transient state of the voltage between the anode and the cathode; • applying (in 58) a third value of current between the anode and the cathode, so as to obtain a constant voltage between the anode and the cathode, with the third value of current being different from the first value of current; with the third value of current being close to the value of a limit current inducing the complete consumption of the fuel feeding the anode of an ideal device; with the first and third values of current presenting a difference of at least 5%; • then varying (in 58) the current applied between the anode and the cathode between the third value of current and a fourth value of current, so as to induce a second transient state of the voltage between the anode and the cathode; • comparing (in 60) the first and second transient states and detecting the occurrence of a phenomenon of oxidation of the anode if the first and second transient states differ from each other by more than a previously-determined value.