Corrosion behaviour of chromium coatings obtained by direct and reverse pulse plating electrodeposition in NaCl aqueous solution

Evidence for a Cr metastable phase as a tracer in DLI-MOCVD chromium hard coatings usable in high temperature environment

“…electrodeposition [1][2][3] or arc evaporation [8], and (ii) there is no significant difference for MOCVD and DLI-MOCVD coatings depending on the nature of the inhibitor used, which means that the presence of the metastable phase ␦-Cr does not significantly affect mechanical properties. The very high hardness of the same order of magnitude as that of chromium carbides is probably due to carbon supersaturation in Cr as revealed by XPS analyses (Fig.…”

“…Commercial BEBC, bis(ethylbenzene)chromium (from Strem Chemicals, CAS 12212-68-9, in fact a mixture of [(C 2 H 5 ) x C 6 H 6-x ] 2 Cr where x = 0-4) was used as chromium precursor. It is a viscous liquid that was mixed with anhydrous toluene (99.8% from SigmaAldrich, CAS 108-88-3) at 3 × 10 −1 mol L −1 (4 g of BEBC in 50 mL of toluene).…”

“…In order to grow protective metallic chromium coatings, wet routes generally use a lot of toxic chemicals including chromic acid solutions based on hexavalent chromium [1][2][3] which is now forbidden by REACH regulation. Several alternatives are investigated using trivalent chromium [4,5] but they should also result in a regulation ban.…”

Ni–Fe–Mn–(nano)Al2O3 Coating with Modulated Composition and Grain Size

“…To account for the non-ideal frequency response, constant phase element (CPE) has been used in the equivalent circuit instead of capacitive component (C i ). The non-ideal capacitive response of the system can be related to several factors such as surface inhomogeneity, roughness, distributed surface reactivity, and electrode porosity [38]. In this circuit, R s is the electrolyte resistance, CPE represents the double layer capacitance, and R c accounts for the charge transfer resistance of the corrosion process through the coating.…”

Evaluation of Corrosion and Tribological Behavior of Electrodeposited Tungsten Alloys

“…Currently, the hard chromium coatings are used most extensively due to high hardness, excellent wear resistance, low coefficient of friction and excellent protection against corrosion [1][2][3]. However, because of the environmental and health risks associated with usage of toxic and carcinogenic hexavalent chromium baths during the electroplating, there is an urgent demand in a potential replacement for this coating.…”