Fig. 10: Surface waviness analysis of machined SLMed samples.

The 3D view of surface waviness in a section of the cavity machined with a–e ECM and f–i LECM along with j methodology for k waviness analysis (error bars of standard deviation of 4 measurements). With both a–c ECM and f–i LECM the crevice sites form at pore sites and coalesce overtime to generate dissolution regions with passivated ridges as quantified by increasing k Wa and Wdr. c With ECM at 20 V there is possible high porosity influence and limited passivation weakening k decrease in Wa). h, i Passivation weakening at ridge sites is better and porosity influence is reduced with LECM which improves crevice/ridge levelling k lower Wa and Wdr).