A Comparative Research on Corrosion Behavior of Electroplated and Magnetron Sputtered Chromium Coatings

Chromium deposits rank among the most widespread metal coatings for functional and decorative purposes. However, electrodeposition from Cr(VI) aqueous solution, which is industrial process currently used to achieve thin chromium deposits, presents several environmental issues, urging development of alternative solutions. In this study, aims compare aesthetical properties coatings, 800 nm thick layers were deposited directly onto copper substrates by means magnetron sputtering (MS) direct current (ED). The obtained characterized regarding their thickness, morphology, color index, chemical composition, corrosion resistance viewpoints. With respect electroplated samples, constitute benchmark, sputtered ones appeared be darker but showed a pleasing reflective appearance superior thickness homogeneity, as well absence voids macrocracks, evidenced scanning electron microscopy (SEM) investigation. Regarding anticorrosion performances layers, electrochemical standard salt spray test (NSS test) carried out at room temperature in 3.5% NaCl similar, if not better, results coatings. On whole, data displayed here demonstrates suitability technology use an industrially feasible finishing both aesthetic mild-condition