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The influence of heat-treatments on the electrochemical behavior of thermal spray Cr 3 C 2 -NiCr coatings prepared by high velocity oxygen fuel (HVOF) was studied in NaCl solution, at 25°C, using open-circuit potential (E OC ) and electrochemical impedance spectroscopy (EIS) measurements. Coating characterization were performed before and after the heat-treatments and electrochemical tests by scanning electron microscopy, X-ray diffraction, and Auger electron spectroscopy. In addition to the changes in the original powder composition occurring during HVOF process, heat-treatment performed at 450°C caused no significant changes in electrochemical response compared with untreated sample, and at 760°C the main difference was the formation of a thin and defective layer of Cr 2 O 3 at the coating surface, which increased the total impedance at the first day of immersion. Higher influence on the electrochemical was noted for samples treated at 880°C, which also showed higher E OC and total impedance, and lower corrosion current. This behavior was interpreted considering the formation of a chromium oxide layer on the coating surface, dissolution and decomposition of smaller carbide particles and their surface enrichment with Cr due to C diffusion and dissolution into the matrix, and possible Ni, Cr, and Fe diffusion to coating/substrate interface.

Electrochemical and Structural Characterization of Heat-Treated Cr[sub 3]C[sub 2]–NiCr Coatings