The aim of this research was to study the effect of sodium tungstate concentration in silicate base electrolyte from zero to three grams per liters and the cathodic pulse of current on metallurgical and corrosion behavior of plasma electrolytic oxidation coatings grown on 7075 Al alloy. Tungsten containing phases in addition gamma alumina as a main phase of the coatings appeared with adding the sodium tungstate to the electrolyte. The structure of the coating was pancake like structure and volcano like structure due to A type and C type sparks were added to morphology about tungsten containing coatings. The amount of defects on tungsten containing coatings were more than coating without additive.Increasing the additive concentration led to increasing the thickness, roughness and darkness of the coatings. Corrosion behavior of the coatings was evaluated by Tafel polarization and electrochemical impedance spectroscopy. The results showed that corrosion potential and corrosion current density increased significantly with adding sodium tungstate and the negative effect of defects was more than the positive effect of thickness on corrosion behavior. Nanoindentation tests results revealed that the mechanical properties were improved by adding sodium tungstate. In the following, the effect of cathodic duty cycle on metallurgical and corrosion properties of the tungsten containing coatings were investigated. XRD results showed that coatings mainly composed of gamma alumina and elemental tungsten and the tungsten amount was decreased with increasing the cathodic duty cycle. By increasing the cathodic duty cycle, the ratio of volcanos to pancakes was increased leading to a more compact coating showing the lowest corrosion current density with the ability for blocking its defects by corrosion products at long term immersion. When the bipolar waveforms were used, the mechanical properties of the coatings including harness and elastic module had also improved