METHOD AND DEVICE FOR DETERMINING THE CORROSION PROTECTION CAPACITY OF A LIQUID

The invention relates to a method for determining the corrosion protection capability of a liquid, in particular a cooling liquid for an internal combustion engine, by means of determining the electrical conductivity between two electrodes (3, 4) introduced at a distance from one another into a sample of the liquid, wherein a direct voltage is applied between the electrodes (3, 4). According to the invention, the direct voltage is derived from an energy storage device (11) which discharges via the electrodes (3, 4) as a function of the conductivity of the liquid. The corrosion protection capability is derived from the determination of the time duration of the discharge between a first and a second state of charge of the energy storage device or the state of charge of the energy storage device after the elapse of a specified period of time. (Fig. 2)