ステンレス(SUS304) = 1.5nm (Ra)
チタニウム(Gr-1) = 5-6nm (Ra)
アルミニウム(Pure Al) = 4-5nm (Ra)
M. Arakawa and S. Kusakabe; Titanium Japan, vol. 57, No.3, p220
"Polishing of Titanium"
Various techniques for polishing of titanium such as mechanical, chemical, electrolytic and electrolytic-abrasive polishing and so on have been outlined.
Recently the titanium sheet with the average surface roughness (Ra) of nanometer-order has been obtained by using the mechanical and the electrolytic-abrasive polishing processes with comparative ease. The mirror polished titanium has served various uses from the artistic production to the high technology field e.g. as MEMS devices. In case of complex parts as the dental and the medical treatments, the electrolytic polishing is preferably applied.
It is important that the polishing technique should be selected with the shape and size of the work.