PROTECTION OF STEEL JISG 3141 WITH CHROMIUM-FREE CONVERSION COATING BASED ON INORGANIC SALT (Zr/Ti/Mo)

Authors

  • Duong Thi Hong Phan The University of Da Nang, University of Science and Technology, 54 Nguyen Luong Bang, Da Nang, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/55/5B/12210

Keywords:

chromium-free, Molybdate, the salt spray, conversion coating, steel.

Abstract

Chromium-free conversion coatings based on Zr/Ti/Mo compounds were prepared to improve the corrosion resistance of the SPCC-JISG 3141 steels. Passivation layer containing Zr, Ti and Mo has been successfully carried out on steel by dipping in solution of 17 g/l Na2MoO4, 8 g/l K2ZrF6, 1 g/l H2TiF6 and pH = 5. Scanning electron microscopy couples with energy - dispersive spectroscopy (SEM/ EDX) were used to provide the microscopy structure information and presence of Zr/Ti/Mo on surface of the steels. The corrosion potential and current of coating in case of with and without passivation layer on the steels was determined by potentiodynamic polarization test, showed that the corrosion current density decreased when using Zr/Ti/Mo coating. The passivation layer provided the corrosion resistance of coating. Furthermore, the salt spray test (Model SAM Y90) evidenced the higher corrosion resistance of the coated samples compared to bare steel when electro - deposition coating (ED) applied. The treatment using inorganic salt could significantly increase the anticorrosion of steels with their environment-friendly.

Downloads

Download data is not yet available.

Downloads

Published

2018-03-24

How to Cite

Hong Phan, D. T. (2018). PROTECTION OF STEEL JISG 3141 WITH CHROMIUM-FREE CONVERSION COATING BASED ON INORGANIC SALT (Zr/Ti/Mo). Vietnam Journal of Science and Technology, 55(5B), 57. https://doi.org/10.15625/2525-2518/55/5B/12210

Issue

Section

Articles