Fig. 1. (a) Principle of laser melting deposition; (b) structure of TC4-Cu duplex coatings

Fig. 2. (a) Single-channel and (b) multi-channel macro-morphologies of TC4-Cu duplex coating prepared by laser melting deposition

Fig. 3. Morphologies of TC4-Cu duplex coating prepared by laser melting deposition. (a) TC4-Cu and Cu-matrix interfaces; (b) Cu-matrix interface; (c) TC4-Cu interface; (d) middle part of TC4 coating

Fig. 4. XRD patterns of TC4-Cu duplex coating prepared by laser melting deposition

Fig. 5. Microhardness distribution of TC4-Cu duplex coating prepared by laser melting deposition

Fig. 6. Electrochemical corrosion behavior of A3 steel, commercial TC4 alloy and TC4-Cu duplex coating prepared by laser melting deposition. (a) Self-corrosion potential versus time; (b) Tafel curves; (c) Nyquist curve of TC4-Cu duplex coating; (d) Nyquist curves of A3 steel and commercial TC4 alloy

Fig. 7. Microstructures of (a) TC4-Cu duplex coating prepared by laser melting deposition, (b) commercial TC4 alloy, and (c) A3 steel after potential polarization corrosion