Abstract
This paper focuses on the preparation of titanium diboride (TiB 2) coatings on the graphite substrate by continuous current plating (CCP) and pulse current plating (PIC) electrochemical techniques in fluoride electrolytes (LiF-NaF-KF) containing K 2TiF 6 and KBF 4 as the electrochemically-active components at 700°C. Thick leveled and uniform coatings were obtained and were composed of relatively pure TiB 2. The effect of the experimental parameters on the microstructure of the coatings was studied. The results showed the electrodeposition with PIC produced coatings with better quality, when compared with those obtained by CCP, under the conditions of the current density i = 0.6 A/cm 2, frequency = 100 Hz, and t on/ t off = 4/1. XRD analysis indicated that the preferred orientation of coatings is (110) plane, which is in accordance with the prediction of the two-dimensional crystal nuclei theory. The effect of a ratio of t on/ t off and frequency on the crystal size, texture coefficient and microstress was also investigated.
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