{ "@context": "https://schema.org", "@type": "Dataset", "@id": "https://www.z-beam.com/datasets/contaminants/anodized-aluminum-laser-cleaning#dataset", "identifier": "anodized-aluminum-laser-cleaning", "name": "anodized-aluminum", "description": "anodized-aluminum", "url": "https://www.z-beam.com/datasets/contaminants/anodized-aluminum-laser-cleaning", "includedInDataCatalog": { "@type": "DataCatalog", "name": "Z-Beam Laser Cleaning Entity Registry", "url": "https://www.z-beam.com/datasets" }, "variableMeasured": [ { "@type": "PropertyValue", "name": "al2o3OpticalProperties", "value": "Al₂O₃ has a bandgap >8 eV making it transparent to 1064 nm — single-photon absorption is blocked; effective laser removal requires multiphoton absorption or shorter wavelengths", "propertyID": "contaminant:anodized-aluminum/facts.al2o3OpticalProperties", "citation": [ { "@id": "#mdpi-sapphire-ir-absorption-2025" } ] }, { "@type": "PropertyValue", "name": "anodizedLayerTypes", "value": "Aluminum anodizing is typically referred to by its three types: Type I chromic acid (0.0001\"), Type II sulfuric acid (0.0002–0.0006\"), Type III hardcoat (0.0005–0.0030\")", "propertyID": "contaminant:anodized-aluminum/facts.anodizedLayerTypes", "citation": [ { "@id": "#anoplate-hardcoat-anodize" } ] }, { "@type": "PropertyValue", "name": "anodizedLayerStructure", "value": "nanopores, 10–150 nm in diameter — these pores are what allow the electrolyte solution and current to reach the aluminium substrate and continue growing the coating", "propertyID": "contaminant:anodized-aluminum/facts.anodizedLayerStructure", "citation": [ { "@id": "#wikipedia-anodizing" } ] }, { "@type": "PropertyValue", "name": "ablationThresholdAnodized", "value": "At 1064 nm, oxide removal threshold is 4.9±0.4 J/cm² — more than 30× higher than at 355 nm (0.15±0.02 J/cm²)", "propertyID": "contaminant:anodized-aluminum/facts.ablationThresholdAnodized", "unitText": "J/cm² (1064 nm ns-pulsed, Type II anodize)", "citation": [ { "@id": "#upc-wavelength-pulse-duration-oxides" }, { "@id": "#copp-aluminum-oxide-cleaning-2024" }, { "@id": "#sciencedirect-al2024-laser-oxide-cleaning" } ] }, { "@type": "PropertyValue", "name": "nativeAluminumOxide", "value": "pure aluminium self-passivates by forming a surface layer of amorphous aluminium oxide 2 to 3 nm thick, which provides very effective protection against corrosion", "propertyID": "contaminant:anodized-aluminum/facts.nativeAluminumOxide", "citation": [ { "@id": "#wikipedia-anodizing" } ] }, { "@type": "PropertyValue", "name": "aluminumFdamage", "value": "the damage threshold was 11.46 J/cm² — at the damage threshold, the surface exhibited severe melting; the optimum state was achieved at 7.64 J/cm²", "propertyID": "contaminant:anodized-aluminum/facts.aluminumFdamage", "citation": [ { "@id": "#sciencedirect-al2024-laser-oxide-cleaning" } ] }, { "@type": "PropertyValue", "name": "uvLaserForAlumina", "value": "Nanosecond oxide removal threshold at 355 nm is 0.15 J/cm² vs 4.9 J/cm² at 1064 nm — more than 30× lower at UV wavelengths", "propertyID": "contaminant:anodized-aluminum/facts.uvLaserForAlumina", "citation": [ { "@id": "#upc-wavelength-pulse-duration-oxides" } ] }, { "@type": "PropertyValue", "name": "localizedAnodizeRepair", "value": "By proper adjustment of the laser parameters, the laser beam removes only the coating and only at precise locations — revealing the metal underneath", "propertyID": "contaminant:anodized-aluminum/facts.localizedAnodizeRepair", "citation": [ { "@id": "#laserax-anodized-marking" } ] }, { "@type": "PropertyValue", "name": "laserVsChemicalStripAl", "value": "Laser cleaning eliminates chemical disposal, generates no secondary chemical waste, and is non-contact — no Cr(VI) handling, no wastewater treatment", "propertyID": "contaminant:anodized-aluminum/facts.laserVsChemicalStripAl", "citation": [ { "@id": "#wang-lca-laser-cleaning-2024" } ] }, { "@type": "PropertyValue", "name": "absorptionProfile", "value": "Al₂O₃ bandgap ~7–8 eV (amorphous) — 1064 nm photon energy (1.17 eV) is far below bandgap. Single-photon absorption blocked — absorption occurs via defect states (F-centers, impurities, dye-filled pores). 355 nm UV (3.49 eV) couples 30× more efficiently. Electrolytic dye (Sn, Ni in Type II) boosts absorption enough for ns-1064 nm ablation at 3–10 J/cm².", "propertyID": "contaminant:anodized-aluminum/facts.absorptionProfile", "citation": [ { "@id": "#mdpi-sapphire-ir-absorption-2025" }, { "@id": "#upc-wavelength-pulse-duration-oxides" } ] }, { "@type": "PropertyValue", "name": "formationChemistry", "value": "Anodized aluminum oxide is an electrochemically grown, porous Al₂O₃ layer — NOT a contaminant in the corrosion-product sense. Type I (chromic acid, 0.5–7.6 μm), Type II (sulfuric acid, 1.8–25 μm, the most common architectural/structural), Type III (hardcoat, 12–150 μm, MIL-A-8625). Porous hexagonal honeycomb nanostructure with 10–150 nm diameter pores allows dye/sealant/contaminant absorption. The anodized layer must be REMOVED before repair while preserving the native 2–3 nm aluminum oxide passivation layer.", "propertyID": "contaminant:anodized-aluminum/facts.formationChemistry", "citation": [ { "@id": "#anoplate-hardcoat-anodize" }, { "@id": "#wikipedia-anodizing" } ] }, { "@type": "PropertyValue", "name": "detectionMethods", "value": "Visual: anodized surface is matte/metallic and colored (dye or natural); bare aluminum is bright metallic. Eddy current: detects anodized vs bare via conductivity difference. MIL-A-8625 Type III inspection per specification. Cross-section microscopy for thickness verification.", "propertyID": "contaminant:anodized-aluminum/facts.detectionMethods", "citation": [ { "@id": "#anoplate-hardcoat-anodize" } ] }, { "@type": "PropertyValue", "name": "byproducts", "value": "{\"airborne\":\"Al₂O₃ particulate dust plus dye/pigment decomposition products from electrolytically colored layers\",\"filtration\":\"Standard HEPA particulate extraction\",\"wasteClassification\":\"Al₂O₃ particulate is generally non-hazardous. Cr(VI) risk from Type I chromic-acid anodize layers — assess before stripping\"}", "propertyID": "contaminant:anodized-aluminum/facts.byproducts", "citation": [ { "@id": "#wikipedia-anodizing" } ] }, { "@type": "PropertyValue", "name": "downstreamCompatibility", "value": "{\"recontamination\":\"Bare aluminum re-forms its native 2–3 nm oxide passivation layer in minutes in air — no flash-rust equivalent\",\"surfaceReadiness\":\"Localized anodize removal enables precise re-anodizing without masking entire part. Chemical NaOH stripping attacks base aluminum (dimensional loss); Cr(VI) strippers are heavily regulated. Laser enables targeted removal with zero chemical bath waste. CRITICAL: anodized layer vs native oxide distinction — laser must NOT breach the native oxide barrier that provides corrosion resistance\"}", "propertyID": "contaminant:anodized-aluminum/facts.downstreamCompatibility", "citation": [ { "@id": "#laserax-anodized-marking" }, { "@id": "#wang-lca-laser-cleaning-2024" } ] }, { "@type": "PropertyValue", "name": "laserDamageThreshold", "value": "2–5", "propertyID": "contaminant:anodized-aluminum/facts.laserDamageThreshold", "unitText": "J/cm²", "wavelengthNm": 1064, "pulseRegime": "ns", "citation": [ { "@id": "#1016-mechanism-2020" } ] } ], "measurementTechnique": "Laser cleaning parameter measurement", "license": { "@type": "CreativeWork", "name": "CC BY 4.0", "url": "https://creativecommons.org/licenses/by/4.0/" }, "creator": { "@type": "Organization", "name": "Z-Beam Laser Cleaning" }, "publisher": { "@type": "Organization", "name": "Z-Beam Laser Cleaning", "url": "https://www.z-beam.com" }, "dateModified": "2026-08-31", "version": "3.0", "citation": [ { "@type": "ScholarlyArticle", "@id": "#1016-mechanism-2020", "headline": "Investigation on mechanism of oxide removal and plasma behavior during laser cleaning on aluminum alloy, Applied Surface Science, 2020", "sameAs": "https://doi.org/10.1016/j.apsusc.2019.144428" }, { "@type": "ScholarlyArticle", "@id": "#anoplate-hardcoat-anodize", "headline": "Anoplate, 'Hardcoat Anodize | MIL-A-8625 Type III (3) | Aluminum Anodizing'", "sameAs": "https://www.anoplate.com/finishes/hardcoat-anodize" }, { "@type": "ScholarlyArticle", "@id": "#copp-aluminum-oxide-cleaning-2024", "headline": "Nanosecond Laser Cleaning of Aluminum Alloy Oxide Film, COPP Journal", "sameAs": "https://www.coppjournal.org/journal/view.html?uid=1578" }, { "@type": "ScholarlyArticle", "@id": "#laserax-anodized-marking", "headline": "Laserax, 'Marking and Uncoating of Metals with Laser Ablation' — Anodized aluminum removal section", "sameAs": "https://www.laserax.com/blog/marking-and-uncoating-of-metals-with-laser-ablation" }, { "@type": "ScholarlyArticle", "@id": "#mdpi-sapphire-ir-absorption-2025", "headline": "Infrared Absorption of Laser Patterned Sapphire Al₂O₃ for Radiative Cooling, MDPI Micromachines, 2025", "sameAs": "https://www.mdpi.com/2072-666X/16/4/476" }, { "@type": "ScholarlyArticle", "@id": "#sciencedirect-al2024-laser-oxide-cleaning", "headline": "Laser cleaning of oxide layers on A2024 aluminum alloy, Journal of Materials Research and Technology, 2024", "sameAs": "https://www.sciencedirect.com/science/article/pii/S2238785426009828" }, { "@type": "ScholarlyArticle", "@id": "#upc-wavelength-pulse-duration-oxides", "headline": "Influence of wavelength and pulse duration on the laser cleaning of oxide layers, Universitat Politècnica de Catalunya", "sameAs": "https://upcommons.upc.edu/bitstreams/36ba953a-10fb-43f5-9fb1-786cece0f6d5/download" }, { "@type": "ScholarlyArticle", "@id": "#wang-lca-laser-cleaning-2024", "headline": "Wang, R., et al., 'Characteristic and mechanism of pollution by laser cleaning high-value vehicle parts with a complex structure in remanufacturing industry,' Sustainable Materials and Technologies, 2024. LCA comparison: laser cleaning reduced total environmental impact by ~40% vs solvent-ultrasonic and ~83.3% vs sandblasting.", "sameAs": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12744604" }, { "@type": "ScholarlyArticle", "@id": "#wikipedia-anodizing", "headline": "Anodizing — Wikipedia, The Free Encyclopedia", "sameAs": "https://en.wikipedia.org/wiki/Anodizing" } ] }