In this study, 0,2% and %0,5 carbon added DistaloyAB metal powders were pressed under 420 MPa compression and sintered. The specimens produced were coated with diamond nanoparticle added chromium using electrochemical method. The coated and uncoated specimens were compared and the effect of coating on the microstructure, and corrosion behavior of the powder metal specimens was studied. The specimens were examined with scanning electron microscope (SEM) and atomic force microscopy (AFM). Their corrosion rates were measured in 0,1 M H2SO4 and 0,1M NaOH solutions by applying Tafel extrapolation method. The experimental results showed that coating of powder specimens with diamond nanoparticles added chromium decreases corrosion rate the samples.