Application of an experimental design to study AISI 4340 and 300M steels electropolishing in a concentrated perchloric/acetic acid solution

The objective of this study was to assess AISI 4340 and 300 M steels electropolishing performance in a concentrated perchloric/acetic acid electrolyte. The statistical analysis on a two-level fractional design (FFD) 2 4-1 was proposed to define an adequate tool to describe the dissolved thickness and the final surface via arithmetic roughness Ra. A compromise zone was defined for each steel by considering all the requirements for both responses of each steel: dissolved thickness between 15–17 μ m and arithmetic roughness criteria less than 0.06 μ m.