# US 2021/0332249 A1 · Additive for quality determination of conversion coatings > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0332249 A1 - Document ID: US20210332249A1 - Status: Published application - Kind: A1 - Application number: 17/370,489 - Filed: 2021-07-08 - Published: 2021-10-28 - Earliest claimed: 2018-10-04 - Assignees: Hamilton Sundstrand Corporation - Applicants: Hamilton Sundstrand Corporation - Inventors: Sean C. Emerson; Blair A. Smith; Weina Li; Georgios S. Zafiris; Bart Antonie Van Hassel - Web page: https://patentgrep.com/patent/US20210332249A1 ## CPC - C09D 5/004: {Reflecting paints; Signal paints} - C09D 5/08: Anti-corrosive paints - C09D 5/084: {Inorganic compounds} - C09D 5/086: {Organic or non-macromolecular compounds} - C09D 5/22: Luminous paints {(luminescent compositions C09K11/00)} - C09D 5/32: Radiation-absorbing paints {(protection against X-, gamma- or corpuscular radiation G21F)} - C09D 7/40: Additives - C23C 22/34: containing fluorides or complex fluorides - C23C 22/48: not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates - G01N 21/6447: {by visual observation} - C09K 11/00: Luminescent materials, e.g. electroluminescent or chemiluminescent - C23C 2222/10: Use of solutions containing trivalent chromium but free of hexavalent chromium - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract A method of applying a trivalent chromium or chromium-free conversion coating to a metallic substrate including mixing a dye compound that interacts with electromagnetic radiation outside the human visual spectrum but not electromagnetic radiation that is within the human visual spectrum to produce an observable emission into the trivalent chromium or chromium-free conversion coating mixture to allow for inspection of the coating after applied with a correlating electromagnetic radiation source. ## Claims ### Claim 1 A component comprising: a substrate; and a conversion coating thereon comprising: a corrosion inhibiting compound; and a dye compound, wherein the dye compound interacts with electromagnetic radiation outside the human visual spectrum to produce an observable emission, the dye compound comprises phosphorescent molecules selected from the group consisting of strontium aluminates, lanthanide doped strontium aluminates, manganese doped strontium aluminates, and copper activate zinc sulfide. ### Claim 2 (depends on 1) The component of claim 1, wherein the substrate is selected from the group consisting of aluminum, magnesium, zinc, nickel, titanium, silver, steel, tin, and alloys thereof. ### Claim 3 (depends on 1) The component of claim 1, wherein the dye compound contains molecules observable in the visible, infrared, or ultra violet range of the electromagnetic spectrum. ### Claim 4 (canceled) ### Claim 5 (depends on 1) The component of claim 1, wherein the dye compound emits visible light when exposed to ultra-violet electromagnetic radiation. ### Claim 6 (depends on 1) The component of claim 1, wherein the conversion coating has a thickness of 20-500 nm. ### Claim at position 7 -15. (canceled) ### Claim 16 A method of inspecting a conversion coating comprising: applying electromagnetic radiation to a conversion coating comprising a non-hexavalent chromium corrosion inhibiting compound and a dye compound that interacts with electromagnetic radiation to produce an observable emission, wherein the dye compound comprises phosphorescent molecules selected from the group consisting of strontium aluminates, lanthanide doped strontium aluminates, manganese doped strontium aluminates, and copper activate zinc sulfide; and inspecting the integrity of the conversion coating with by observing emissions from the dye compound in response to the electromagnetic radiation. ### Claim 17 (depends on 16) The method of claim 16, further comprising applying the conversion coating to a substrate and curing the conversion coating on the substrate. ### Claim 18 (depends on 16) The method of claim 16, wherein applying electromagnetic radiation comprises inducing phosphoresce in the dye compound. ### Claim 19 (canceled) ### Claim 20 (depends on 16) The method of claim 16, wherein applying electromagnetic radiation comprises exposing the dye compound to ultra violet light to induce black light emission from the dye compound.