Anodic-spark layers on aluminum and titanium alloys in electrolytes with sodium phosphotungstate

Abstract

The influence exerted by the pH of an aqueous 0.0083 M solution of Na 2 H[PW 12 O 40 ] on the composition and morphology of anodic coatings galvanostatically formed on aluminum and titanium alloys at sparking and breakdown voltages was studied.

Purified titanium oxide with novel morphologies upon spark anodization of Ti alloys in mixed H2So4/H3PO4 electrolytes

“…8 Considerable effort was made to incorporate Ca and P species during SA of c.p.-Ti surfaces for further enhancing the bioactivity of titanium implants, without having the mechanical drawbacks of hydroxyapatite (HA) coatings. [10][11][12][13][14][15][16] Porous anodized films on Ti6Al4V a/b alloy have initially been found interesting for bonding purposes, 17 and more recently for wear-and corrosion-resistant applications, [18][19][20][21][22][23][24][25][26][27][28][29] biocidal 30 or catalytic properties, 31,32 sensors, 33 and also as biomedical coatings. [34][35][36][37][38] Among several studies on biomedical issues, the study by Cigada et al 34 was the first to report a significant decrease in the release of metal ions (Ti, Al, V) when exposing Ti6Al4V surfaces, spark anodized in H 3 PO 4 -containing electrolytes, to a physiological solution.…”