PVD Rose GoldFinish

The resulting film thickness ranges strictly between 0.3 and 5 microns, controlled by quartz crystal monitoring to ±0.05 micron precision, ensuring optical interference produces the specific rose hue (L*a*b*: 65-75, 18-28, 8-18) while maintaining the underlying mechanical properties of the 304 food-grade stainless steel base per ASTM A240. Unlike electroplating which relies on wet chemical baths and hexavalent chromium (CrVI) compounds regulated under EU REACH Annex XVII, Fadior's PVD process is a dry, line-of-sight deposition technique that bonds the coating metallurgically to the steel lattice with no liquid waste stream.

The chemical composition of the coating consists of Titanium (Ti, 35-45 at.%), Aluminum (Al, 15-25 at.%), Nitrogen (N, 25-35 at.%), and Carbon (C, 5-15 at.%), forming a nanocrystalline ceramic matrix (grain size 15-40 nm per XRD analysis) that is chemically inert and meets ISO 10993-5 cytotoxicity standards for biocompatibility. The base material remains 304 stainless steel (EN 1.4301, UNS S30400), containing 18-20% chromium and 8-10.5% nickel with carbon ≤0.08%, ensuring that even if the coating were breached, the substrate retains its inherent corrosion resistance (pitting resistance equivalent PREN ≥18).

The specific shade of rose gold is tuned by adjusting the N2/C2H2 partial pressure ratio during deposition; increasing acetylene flow shifts the color toward warmer, redder tones (a* >25), while nitrogen dominance yields a paler pink (a* <20). This atomic-level engineering ensures the color is not surface paint or laminate but an integral part of the material's outermost 2-3 atomic layers, making delamination impossible under residential conditions (peel strength >50 N/mm per ASTM D3359 Method B).