An Estimation of Local Residual Stresses in Amorphous and Crystallized Trivalent Chromium Coatings

Hard chromium coatings have demonstrated their performance for several decades, particularly wear and corrosion resistance properties. However, the traditional process using trioxide (CrO3) is very toxic intended to disappear in European Union by 2024, thanks REACH regulation. This study aimed determine residual stress of amorphous deposits elaborated from baths containing trivalent ions. structure these does not allow determination stresses conventional means. In this study, we propose adapting a recent method called “FIB-DIC”, which limited material’s crystalline compared classical X-ray diffraction (XRD) analysis. The based on measurement relaxation-induced displacement fields following ablation material local scale. results obtained FIB-DIC crystallized heat-treated Cr(III) are 296 ± 45 377 275 MPa. Then, technique allowed us evaluate level 479 359 MPa coating, has never been performed before.