Abstract
The corrosion resistance of highly porous titanium in a 20 % HCl solution was investigated using various surface engineering methods, including ball burnishing (BB) and gaseous nitriding (GN) below the polymorphic transformation temperature (α + β) and their combination (DDT). SEM, EDS, XRD, as well as micro- and nano-hardness testing methods, were employed to assess the microstructure of the formed barrier layers and determine their depth. After treatments, the corrosion was significantly reduced, with the corrosion current density being 8.7 to 25 times lower compared to the initial state of highly porous titanium. The results suggest that a DDT yielded the most substantial enhancement in the corrosion resistance of highly porous titanium.
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