Patent ID: 8431190

Claim:
A process for deposition of a hard coating of metal chromium or of another metal whose chemical properties are similar to those of chromium, by direct liquid injection-chemical vapor-phase deposition on a metal substrate, comprising the steps of: a) Taking a solution that contains, in an oxygen-free solvent, i) a molecular compound of the bis(arene) family, precursor of the metal to be deposited, whose decomposition temperature is between 300° C. and 550° C., and ii) a chlorinated additive, the precursor compound and the solvent are selected such that the saturation concentration of the precursor compound in the solvent is greater than or equal to 0.01M, and the precursor compound and the chlorinated additive are in a molar ratio of at most 10%, b) Forming an aerosol of said solution by direct liquid injection, said solution being pressurized and injected in a pulsed mode, and introducing said solution in aerosol form into an evaporator, said evaporator being at atmospheric pressure and heated to a temperature of between the boiling point of the solvent and the decomposition temperature of the precursor, c) Entraining the aerosol that is evaporated by a neutral gas stream from the evaporator to a CVD reactor comprising a susceptor that supports the substrate to be coated, the CVD reactor being at atmospheric pressure and heated to a temperature that is higher than the decomposition temperature of the precursor and at most 550° C., wherein chromium deposits formed on the substrate by steps a) to c) are carbon-supersaturated solid solutions.