Composite Layers Produced on Steel Surface in Vacuum Titanizing Process Combined with the Electrolytic Deposition of Cobalt

摘要

Diffusion layers produced on the low-carbon steel and iron surfaces by means of vacuum titanizing process have been studied. A new technological process combining a vacuum titanizing with a preliminary electrolytic deposition of cobalt has been proposed to increase the corrosion resistance of layers. As a result, diffusion composite layers of Ti+Co type on the low-carbon steel and iron surfaces have been obtained. Corrosion measurements have been performed in 0.1 M H_2SO_4 by means of electrochemical tests. The highest corrosion resistance was observed for steel samples with the Ti+Co composite layers, which showed the least passive current density, whereas the titanized layers, and the steel without any layer, corroded actively.