Influence of Silicate Concentration in Electrolyte on the Growth and Performance of Plasma Electrolytic Oxidation Coatings Prepared on Low Carbon Steel
- 67 Downloads
Plasma electrolytic oxidation (PEO) coatings were prepared on low carbon steel from electrolytes with different silicate concentrations. The microstructure, elemental and phase compositions of the PEO coatings were analyzed by scanning electron microscope, energy-dispersive spectrometer, and x-ray diffraction, respectively. The adhesion of PEO coatings with low carbon steel substrate was qualitatively examined by thermal shock tests. The tribological properties were evaluated by a reciprocating tribometer sliding against a Si3N4 ceramic ball. The corrosion behaviors of PEO coatings were investigated in 3.5 wt.% NaCl solution by electrochemical impedance spectra and potentiodynamic polarization. Results indicated that all the PEO coatings were comprised of amorphous SiO2 and Fe-containing oxides; however, the silicate concentration in electrolyte showed significant influence on the growth and the performance of PEO coatings. The PEO coating prepared from the electrolyte with silicate concentration of 30 g/L had the highest Fe content because the substrate was more readily oxidized and showed a dense structure, resulting in the best comprehensive performance of adhesion, wear resistance, and corrosion resistance.
Keywordsadhesion corrosion growth process plasma electrolytic oxidation silicate concentration tribological property
- 1.J.D. Liang, S.M. Guo, and Muhammad A. Wahab, Localized Surface Modification on 1018 Low-Carbon Steel by Electrolytic Plasma Process and Its Impact on Corrosion Behavior, J. Mater. Eng. Perform., 1018, 2014(23), p 4187–4192Google Scholar
- 6.Y. Wang, Z.Q. Huang, Q. Yan, C. Liu, P. Liu, Y. Zhang, C.H. Guo, G.R. Jiang, and D.J. Shen, Corrosion Behaviors and Effects of Corrosion Products of Plasma Electrolytic Oxidation Coated AZ31 Magnesium Alloy Under the Salt Spray Corrosion Test, Appl. Surf. Sci., 2016, 378, p 435–442CrossRefGoogle Scholar
- 16.L.B. Boinovich, S.V. Gnedenkov, D.A. Alpysbaeva, V.S. Egorkin, A.M. Emelyanenko, S.L. Sinebryukhov, and A.K. Zaretskaya, Corrosion Resistance of Composite Coatings on Low-Carbon Steel Containing Hydrophobic and Superhydrophobic Layers in Combination with Oxide Sublayers, Corros. Sci., 2012, 55, p 238–245CrossRefGoogle Scholar