Figure 3From: Tribological Behaviors of Electroless Nickel-Boron Coating on Titanium Alloy SurfaceSEM images of the surface of (a) TC4 titanium alloy substrate, (b) as-plated Ni-B coating, (c) air-treated Ni-B coating, (d) nitrogen-treated Ni-B coating and (e) the cross-section of the as-plated electroless Ni-B coating after etching by 2% nital solutionBack to article page