Improved adhesion of a chromium-based coating on a substrate

A method for producing an object comprising a chromium-based coating on a substrate, wherein the method comprises:

• depositing a first chromium-containing layer on the substrate by subjecting the substrate to a first electroplating cycle from an aqueous electroplating bath comprising trivalent chromium cations, wherein the first electroplating cycle is carried out at a current density of 20-90 Amperes per 1 square decimeter (A/dm2) for 0.5-20 minutes to produce a first chromium-containing layer having a thickness of at least 100 nm, and a Vickers microhardness value of 700-1000 HV;
• and
• depositing a second chromium-containing layer on the first chromium-containing layer by subjecting the first chromium-containing layer to a second electroplating cycle from an aqueous electroplating bath comprising trivalent chromium cations, where—in the second electroplating cycle is carried out at a current density of 50-300 A/dm2 such that during the second electroplating cycle the current density is kept at a value of at least 100 A/dm2 before ending the second electroplating cycle, to produce a second chromium-containing layer having a Vickers microhardness value that is at least 1.3 times higher than the Vickers microhardness value of the first chromium-containing layer, and a crystal size of 8-35 nm;
• for improving the adhesion of the chromium-based coating to the substrate.