Results of the investigation of pulse current frequency influence (rectangular unipolar pulses, im =3 A/dm2, relative pulse duration 3, frequency 0.67–333 Hz, Q = 3600 C/dm2) on the properties of Co–W alloys at electrochemical deposition—deposition rate, current efficiency, structure of obtained coatings, and their microhardness (microindentation and sclerometric ones)—are presented. The correlation between the microhardness determined by quasi-static indentation and the “organic” phase content in the alloy is shown (the microhardness decreases as the total content of carbon and oxygen in the deposited layer increases). Sclerometric tests have shown that microhardness increases with an increasing tungsten concentration in the deposited layer.