Abstract
Chromating and phosphating processes have caused severe environmental, health, and industrial concerns. Therefore, developing chrome-free conversion coatings has played an important role in overcoming these issues. In this study, two kinds of titanium-based conversion coatings (H2TiF6 and TiCl4) were developed for cold-rolled steel (CRS) substrate. The effects of practical parameters (immersion time, pH, and Ti concentration) on anti-corrosion performance were evaluated using direct current polarization and electrochemical impedance spectroscopy. It was revealed through investigating corrosion current densities and polarization resistance behavior that the source that provides Ti cation in solution strongly affects the required immersion time for gaining the best anti-corrosion performance. Field emission scanning electron microscopy displayed more compactness and uniformity for optimized TiCl4-based conversion coating. X-ray photoelectron spectroscopy analysis represented that the Ti-based conversion coa...
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