Effects of cathodic current density and temperature on morphology and microstructure of iridium coating prepared by electrodeposition in molten salt under the air atmosphere

▸ The “salt passivation” occurs on the anode surface at low temperatures. ▸ The index of preferred growth crystal plane increases as increasing current density. ▸ The <1 1 1> oriented coating is smoother and denser than <2 2 0>/<3 1 1> oriented coating. ▸ The coating compactness improves as increasing current density/decreasing temperature.