Obtain metallic chromium (Cr⁰) deposits by trivalent chromium in aqueous solution have some disadvantages respect to hexavalent chromium. The obtention of this coatings are not considered feasible to directly from a simple dissolution. The chromium III in aqueous solution presents an octahedral structure [Cr(H₂O)₆]⁺³[3], so the baths for the trivalent chrome require complex forming agents. It is also found that is difficult to obtain the same thickness with chromium III as using chromium VI, J. Mcdougall et al[4] report that it is difficult to obtain deposits greater than 2 µm from trivalent chromium, attributed to microstructural differences, causing the properties of the chromium coatings be diminished compared with the hexavalent chromium.

A form to controlled the phenomena associated with the nucleation of the trivalent chromium electrolytic deposits is nanostructuring the surface sustrate where the electrodeposit is formed. This can do by pulsed laser-induced phenomenon change microstructure of the bulk. Some authors have reported significant improvements using treatments earlier of coats by pulsed lasers (femtosecond) [5][6][7]. The optimized characteristics reported are: Better Adherence, friction coefficients lower, even the nucleation type can be epitaxial.

Therefore, in the present project proposes electrochemical characterization by polarization curves, electrochemical impedance spectroscopy and cyclic voltammetry for substrates of 1008 carbon steel polished and nanostructured by a pulsed laser with pulse ultra-fast. Also structural and morphologic by scanning electron microscopy, X-ray diffraction, etc., Chronoamperometry was used for analyzed the nucleation phenomena on substrates polished and nanostructured materials.

[1] S. G. O. J., “Obtención de un Recubrimiento de Cromo Decorativo a Partir de Soluciones de Cromo Trivalente,” Ing. E Investig., vol. 26, pp. 75–83, 2006.

[2] D. L. Snyder, “Decorative chromium plating basics,” Met. Finish., vol. 110, no. 2, pp. 14–21, 2012.

[3] H. Chun et al., “Molecular and Electronic Structure of Octahedral o -Aminophenolato and o -Iminobenzosemiquinonato Complexes of V ( V ), Cr ( III ), Fe ( III ), and Co ( III ). Experimental Determination of Oxidation Levels of Ligands and Metal Ions,” no. V, pp. 4157–4166, 2001.

[4] J. Mcdougall and S. Ma, “Chromium electrodeposition using a chromium ( III ) glycine complex,” vol. 28, 1998.

[5] C. Yao et al., “The influence of femtosecond laser repetition rates and pulse numbers on the formation of micro/nano structures on stainless steel,” J. Alloys Compd., vol. 722, pp. 235–241, 2017.

[6] X. Chen, Q. Yan, and Q. Ma, “Applied Surface Science Influence of the laser pre-quenched substrate on an electroplated chromium coating / steel substrate,” Appl. Surf. Sci., vol. 405, pp. 273–279, 2017.

[7] P. Zhang, L. Chen, J. Chen, and Y. Tu, “Material removal effect of microchannel processing by femtosecond laser,” Opt. Lasers Eng., vol. 98, no. June, pp. 69–75, 2017.