Research on Corrosion Resistance of Titanizing and Nitriding on Carbon Steel in H₂SO₄ Solution

Abstract:

Q195 steel was treated with titanizing followed plasma nitriding by glow plasma alloying technology using single pulse power supply. The corrosion resistances of titanizing sample and titanizing + ion nitrided sample were studied. The results show that the alloying layer is 200 μm in depth and organization is α-Fe solid solution containing Ti by plasma titanizing technology using single pulse power supply. An obvious reactive diffusion dividing line formed between alloying layer and the substrate. It shows that diffusion phenomenon happened in process of titanizing. The morphology of Ti alloy layer was columnar crystals. The content of Ti on the surface is up to 5 wt%. And the Ti content of alloying layer is in a decreasing from the surface to the inner on a gradient distribution. The phase structure of titanizing layer is composed of Fe₂Ti, Fe-Ti and TiC phases. The phase structure of titanizing + ion nitrided sample was obviously TiN phase and a few Fe-Ti phase. The surface hardness of untreated carbon steel is 110 HV and that of the alloying layer of titanizing is 310HV. The surface hardness of titanizing + ion nitrided sample is 1800HV. The corrosion resistance of titanizing sample is increased 12.15 times compared with the untreated sample and 1.42 times compared with 18-8 stainless steel in H₂SO₄ solution; The corrosion resistance of titanizing + ion nitrided sample is increased 7.444 times compared with the untreated sample and as well as 18-8 stainless steel in H₂SO₄ solution.

• Periodical: Materials Science Forum (Volumes 704-705)
• Pages: 1152-1160
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.704-705.1152
• Online since: December 2011
• Authors: Gen Tao Bu, Yuan Gao, Cheng Lei Wang
• Keywords: Corrosion Resistance, Plasma Nitrided, Polarization Curve, Titanizing

References

[1] Rajan Ambat and Per Mller: Corro. Sci. Vol. 49(2007) , p.2866.

[2] Z. Xu, U.S. Patent 4, 520, 268. (1985).

[3] C. Yue, B. Yang and X. Zhang: Science in China, Series E: Technological Sciences, Vol. 52(2009), p.2269.

[4] J. Xu, X. Xie and Z. Xu: J . Mater. Sci . Technol Vol. 19(2003) , p.404.

[5] Z. Xu , X. Liu , P. Zhang and Y. Zhang: Surf. Coat. Technol. Vol. 201(2007) , p.4822.

[6] X. Zhu, Z. Yao, X. Gu,W. Cong and P. Zhang: Trans. Nonferrous Met. Soc. China Vol. 19(2009) , p.143.