Abstract: The present invention refers to an electroplating composition for plating a chromium coating on a substrate, the composition comprising: (i) a source of hexavalent chromium; (ii) one or more than one betaine comprising a quaternary nitrogen and/or salts thereof; and (iii) one or more than one poly-organosiloxane.

Abstract: The present invention refers to an electroplating composition for depositing a chromium coating on a substrate, the composition including: (i) trivalent chromium ions, (ii) at least one complexing agent for the trivalent chromium ions, and (iii) at least one additive selected from the group consisting of betaines, polymeric glycols, monomeric diols, and mixtures thereof.

Abstract: Method for reducing concentration of iron ions in a trivalent chromium electroplating bath, including: (i) providing the trivalent chromium electroplating bath including trivalent chromium ions, and iron ions, (ii) subjecting at least a portion of the bath to air agitation, to obtain an air-agitated portion of the bath, (iii) contacting the air-agitated portion with an ion exchange resin, to obtain a resin-treated portion of the bath, and (iv) returning the resin-treated portion of the bath to the trivalent chromium electroplating bath, provided that the bath provided in step (i) was or is utilized for electrodepositing chromium on a substrate applying a cathodic current density of 18 A/dm2 or more, after step (iii), iron ions in the resin-treated portion have a lower concentration than in the air-agitated portion, and after step (iv), iron ions in the bath have a concentration below 50 mg/L.

Abstract: A method for depositing a chromium or chromium alloy layer on at least one substrate, the method comprising the steps (a) providing an aqueous deposition bath with a pH in the range from 4.1 to 6.

Abstract: A controlled method for depositing a chromium or chromium alloy layer on at least one substrate, comprising steps (a) providing an aqueous deposition bath comprising trivalent chromium ions and bromide ions, and alkali metal cations in a total amount of 0 mol/L to 1 mol/L, based on the total volume of the bath, and the bath has a target pH from 4.1 to 7.0, (b) providing at least one substrate and at least one anode, (c) immersing the at least one substrate in the bath and applying an electrical direct current to deposit the chromium or chromium alloy layer on the substrate, the substrate being the cathode, wherein during or after step (c) the pH of the bath is lower than the target pH, and (d) adding NH4OH and/or NH3 during or after step (c) to the bath such that the target pH of the bath is recovered.