Effects of substrate temperature and deposition time on the morphology and corrosion resistance of FeCoCrNiMo0.3high-entropy alloy coating fabricated by magnetron sputtering

The effects of substrate temperature and deposition time on the morphology and corrosion resistance of FeCoCrNiMo(0.3)coating fabricated by magnetron sputtering were investigated by scanning electron microscopy and electrochemical tests. The FeCoCrNiMo(0.3)coating was mainly composed of the face-centered cubic phase. High substrate temperature promoted the densification of the coating, and the pitting resistance and protective ability of the coating in 3.5wt% NaCl solution was thus improved. When the deposition time was prolonged at 500 degrees C, the thickness of the coating remarkably increased. Meanwhile, the pitting resistance improved as the deposition time increased from 1 to 3 h; however, further improvement could not be obtained for the coating sputtered for 5 h. Overall, the pitting resistance of the FeCoCrNiMo(0.3)coating sputtered at 500 degrees C for 3 h exceeds those of most of the reported high-entropy alloy coatings.