Ta Modified Layer Prepared on Q235 Steel by Double Glow Plasma Surface Alloying Technology and It′s Corrosion Resistance

The microstructure, composition and corrosion resistance of Ta modified layer which obtained on low carbon steel Q235 by double glow plasma surface metallurgy technology were studied . The results show that the tantalum element distributed gradually from the surface to substrate, Ta modified layer was well bonded to the substrate. The corrosion resistance of Ta modified layer obviously was better than that of the substrate, and it′s protection efficiency was 99.88%. The passive film on Ta modified layer was integral and could protect the substrate efficiently.