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: 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.