Yoshiki Ogawa, Yoshihiro Hisamatsu, Kazutaka Kawamura and Junji Tatsuma
In this paper another method of preparing a protective titanium coating on
mild steel has been dealt with. The procedure consists of electrolyzing potassium
titanium fluoride dissolved in potassium and sodium chloride under an inert,
i.e. argon atmosphere. Electrolytic cell is made of a graphite crucible with
a diameter of 8 cm and a depth of 20 cm, of which the outer surface is protected
by 18-8 stainless steel casing from atmospheric oxidation. Better titanium coatings
were obtained by using modulated current (D.C.partially interrupted at the rate
of 3 times a second) than in the case of plain D.C.
Consistently good results were obtained under following condition:
|Concentration of K2 TiF6||about 16 wt%|
|Cathodic current density||of direct current.||350~650 A/dm2|
|of modulated current.||Upper C.D.||350~650 A/dm2|
|Lower C.D.||130~250 A/dm2|
Please do not copy without permission.