The addition of organic compound containing -COOH, X$800_2$, -CHO group such as formic acid, formamide, formaldehyde or diethyleneamine to a chromium electroplating bath results in a chromium deposit in which carbon is incorporated. Such deposits have fewer defects than chromium layers produced by a conventional method. It was found that the as-deposited layers were amorphous and auger electron spectroscopy (AES) showed that carbon is distributed uniformly in the deposit. During heat treatment, Cr-C deposits began to crystallize at $400^{circ}C$, and at $800^{circ}C$ they were crystallized into chromium carbides and oxides. The effects of current density, amount of additives, applied current waveform on Cr-C alloy electroplating were examined.