{ "@context": "https://schema.org", "@type": "Dataset", "@id": "https://www.z-beam.com/datasets/contaminants/zinc-galvanizing-laser-cleaning#dataset", "identifier": "zinc-galvanizing-laser-cleaning", "name": "zinc-galvanizing", "description": "zinc-galvanizing", "url": "https://www.z-beam.com/datasets/contaminants/zinc-galvanizing-laser-cleaning", "includedInDataCatalog": { "@type": "DataCatalog", "name": "Z-Beam Laser Cleaning Entity Registry", "url": "https://www.z-beam.com/datasets" }, "variableMeasured": [ { "@type": "PropertyValue", "name": "zincTypes", "value": "Hot-dip zinc forms four Fe-Zn intermetallic layers; electroplated zinc is pure zinc with no intermetallics", "propertyID": "contaminant:zinc-galvanizing/facts.zincTypes", "citation": [ { "@id": "#hotdipgalvanizing-intermetallic-layers-2026" }, { "@id": "#galvinfo-galvanizing-2022" } ] }, { "@type": "PropertyValue", "name": "zincMeltingPoint", "value": "Zinc melts at 419.5°C and boils at 907°C — laser heating vaporizes zinc before it ablates the coating", "propertyID": "contaminant:zinc-galvanizing/facts.zincMeltingPoint", "citation": [ { "@id": "#pmc-metal-thermal-expansion-table" } ] }, { "@type": "PropertyValue", "name": "zincFumeHazard", "value": "zinc oxide fume is 5 mg/m³", "propertyID": "contaminant:zinc-galvanizing/facts.zincFumeHazard", "citation": [ { "@id": "#osha-zno-fume-pel-2025" }, { "@id": "#aws-metal-fume-fever-factsheet-2025" } ] }, { "@type": "PropertyValue", "name": "ablationThresholdZincOnSteel", "value": "2.1 J/cm² for picosecond zinc ablation on galvanized steel; nanosecond thresholds are higher at ~35 J/cm²", "propertyID": "contaminant:zinc-galvanizing/facts.ablationThresholdZincOnSteel", "citation": [ { "@id": "#mustafa-laser-ablation-galvanized-2019" }, { "@id": "#zhu-ns-laser-zinc-coating-2021" } ] }, { "@type": "PropertyValue", "name": "intermetallicLayerRemoval", "value": "The Gamma intermetallic layer at the steel interface is metallurgically bonded and the hardest to remove", "propertyID": "contaminant:zinc-galvanizing/facts.intermetallicLayerRemoval", "citation": [ { "@id": "#hotdipgalvanizing-intermetallic-layers-2026" }, { "@id": "#galvinfo-galvanizing-2022" } ] }, { "@type": "PropertyValue", "name": "weldingWithoutRemoval", "value": "AWS D-19.0 requires zinc removal 1-4 inches from weld zone; zinc in the weld pool causes porosity and oxide inclusions", "propertyID": "contaminant:zinc-galvanizing/facts.weldingWithoutRemoval", "citation": [ { "@id": "#aws-d19-welding-zinc-1972" }, { "@id": "#azz-welding-after-galvanizing-2025" } ] }, { "@type": "PropertyValue", "name": "replatingAfterLaser", "value": "Galvanized steel can be stripped and re-galvanized; laser-cleaned bare steel accepts a new zinc coating", "propertyID": "contaminant:zinc-galvanizing/facts.replatingAfterLaser", "citation": [ { "@id": "#aga-stripping-regalvanizing-2014" } ] }, { "@type": "PropertyValue", "name": "fleetFitZincRemoval", "value": "300W pulsed for spot zinc removal; 2000W CW for production-rate full-coverage stripping", "propertyID": "contaminant:zinc-galvanizing/facts.fleetFitZincRemoval", "citation": [ { "@id": "#argentolux-laser-galvanization-removal-2024" } ] }, { "@type": "PropertyValue", "name": "narrowestMarginZinc", "value": "Zinc on thin-gauge steel is the narrowest margin: zinc melts at 419°C, and heat conducts through thin sheet", "propertyID": "contaminant:zinc-galvanizing/facts.narrowestMarginZinc" }, { "@type": "PropertyValue", "name": "laserVsGrindingZinc", "value": "Laser vaporizes zinc to fume; grinding produces zinc dust — both require extraction, but laser generates zero secondary waste", "propertyID": "contaminant:zinc-galvanizing/facts.laserVsGrindingZinc", "citation": [ { "@id": "#osha-zno-fume-pel-2025" }, { "@id": "#argentolux-laser-galvanization-removal-2024" } ] }, { "@type": "PropertyValue", "name": "absorptionProfile", "value": "Zinc galvanizing absorbs 1064 nm more efficiently than bare steel — zinc has lower reflectivity (~60% vs >70% for clean steel at IR). The absorption contrast between the zinc layer and the underlying steel drives selective ablation. However, Zn melts at 419.5°C — a process window floor, not just a threshold. 1064 nm nanosecond pulses vaporize zinc at the focal spot (~2000°C+) while the steel substrate reflects residual energy below damage threshold.", "propertyID": "contaminant:zinc-galvanizing/facts.absorptionProfile", "citation": [ { "@id": "#pmc-metal-thermal-expansion-table" }, { "@id": "#mustafa-laser-ablation-galvanized-2019" } ] }, { "@type": "PropertyValue", "name": "formationChemistry", "value": "Hot-dip galvanizing: steel immersed in molten zinc (~450°C) forms 3-4 Fe-Zn intermetallic layers: Gamma (Γ, Fe₃Zn₁₀, <1 μm), Delta (δ, FeZn₇, 5-15 μm), Zeta (ζ, FeZn₁₃, 10-15 μm), and Eta (η, pure Zn outer layer, 25-60 μm). Total HDG thickness 45-200 μm. Electro-galvanizing: pure zinc electroplated layer only (5-25 μm), no intermetallics. Galvanizing is a sacrificial corrosion protection coating — NOT a contaminant in the corrosion-product sense. It IS removed when welding or when the coating has failed.", "propertyID": "contaminant:zinc-galvanizing/facts.formationChemistry", "citation": [ { "@id": "#hotdipgalvanizing-intermetallic-layers-2026" }, { "@id": "#galvinfo-galvanizing-2022" } ] }, { "@type": "PropertyValue", "name": "detectionMethods", "value": "Magnetic thickness gauge (ASTM D7091) for zinc thickness verification; visual: gray metallic zinc vs bright steel is obvious after removal; copper sulfate spot test (ASTM A239) confirms zinc presence/absence; weld prep inspection per AWS D-19.0 for 1-4 inch zinc-free zone verification", "propertyID": "contaminant:zinc-galvanizing/facts.detectionMethods", "citation": [ { "@id": "#aws-d19-welding-zinc-1972" }, { "@id": "#hotdipgalvanizing-intermetallic-layers-2026" } ] }, { "@type": "PropertyValue", "name": "byproducts", "value": "{\"airborne\":\"Zinc oxide fume (ZnO) — causes metal fume fever 3-10 hours after exposure; OSHA PEL 5 mg/m³ (8-hr TWA) for ZnO fume per 29 CFR 1910.1000 Table Z-1. This is the single most critical safety consideration for laser zinc removal\",\"filtration\":\"HEPA particulate extraction minimum; source-capture fume extraction directly at the laser head is strongly recommended\",\"wasteClassification\":\"Zinc oxide particulate is generally non-hazardous; however the ZnO fume generation during laser removal exceeds grinding rates and requires documented fume extraction verification\"}", "propertyID": "contaminant:zinc-galvanizing/facts.byproducts", "citation": [ { "@id": "#osha-zno-fume-pel-2025" }, { "@id": "#aws-metal-fume-fever-factsheet-2025" } ] }, { "@type": "PropertyValue", "name": "downstreamCompatibility", "value": "{\"recontamination\":\"Bare steel exposed by zinc removal is susceptible to atmospheric flash rust within hours — coat or weld promptly. Re-galvanizing: AGA confirms galvanized steel can be stripped and re-galvanized; small areas of repair zinc can be applied via zinc-rich paint or thermal spray (not full hot-dip)\",\"surfaceReadiness\":\"Laser-zinc-removed steel surface is clean and ready for welding — no grinding marks, no embedded abrasive. AWS D-19.0 requirement for 1-4 inch zinc-free zone around weld is met without mechanical damage to surrounding zinc. Zinc-rich paint touch-up provides sacrificial protection comparable to original galvanizing for repair zones\"}", "propertyID": "contaminant:zinc-galvanizing/facts.downstreamCompatibility", "citation": [ { "@id": "#aga-stripping-regalvanizing-2014" } ] }, { "@type": "PropertyValue", "name": "laserDamageThreshold", "value": "8–15", "propertyID": "contaminant:zinc-galvanizing/facts.laserDamageThreshold", "unitText": "J/cm²", "wavelengthNm": 1064, "pulseRegime": "ns", "citation": [ { "@id": "#1007-wavelength-2022" }, { "@id": "#mustafa-laser-ablation-galvanized-2019" } ] }, { "@type": "PropertyValue", "name": "zincOxideFumePel", "value": "OSHA ZnO fume PEL 5 mg/m³ 8-hr TWA", "propertyID": "contaminant:zinc-galvanizing/facts.zincOxideFumePel", "unitText": "mg/m³", "citation": [ { "@id": "#osha-zno-fume-pel-2025" } ] } ], "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": "#1007-wavelength-2022", "headline": "Wavelength dependence of picosecond-pulsed laser ablation of hot-dip galvanized steel, Applied Physics A, 2022", "sameAs": "https://doi.org/10.1007/s00339-022-05393-4" }, { "@type": "ScholarlyArticle", "@id": "#aga-stripping-regalvanizing-2014", "headline": "American Galvanizers Association, \"Stripping and Regalvanizing,\" KnowledgeBase Article, August 2014", "sameAs": "https://galvanizeit.org/knowledgebase/article/stripping-and-regalvanizing" }, { "@type": "ScholarlyArticle", "@id": "#argentolux-laser-galvanization-removal-2024", "headline": "Argento Lux, \"Laser Ablation: Revolutionizing Galvanization Removal from Steel,\" 2024", "sameAs": "https://www.argentolux.com/post/laser-ablation-revolutionizing-galvanization-removal-from-steel" }, { "@type": "ScholarlyArticle", "@id": "#aws-d19-welding-zinc-1972", "headline": "American Welding Society, \"AWS D-19.0-72 — Welding Zinc-Coated Steel,\" 1972", "sameAs": "https://www.pci.org/PCI_Docs/Publications/PCI%20Journal/1998/May-June/Guidelines%20for%20Welding%20Galvanized%20Steel.pdf" }, { "@type": "ScholarlyArticle", "@id": "#aws-metal-fume-fever-factsheet-2025", "headline": "American Welding Society, \"Safety and Health Fact Sheet No. 25 — Metal Fume Fever,\" AWS, November 2025", "sameAs": "https://aws-p-001-delivery.sitecorecontenthub.cloud/api/public/content/Fact-Sheet-No.25" }, { "@type": "ScholarlyArticle", "@id": "#azz-welding-after-galvanizing-2025", "headline": "AZZ Inc., \"Welding After Hot-Dip Galvanizing,\" Featured Story, 2025", "sameAs": "https://www.azz.com/featured_stories/welding-after-hot-dip-galvanizing" }, { "@type": "ScholarlyArticle", "@id": "#galvinfo-galvanizing-2022", "headline": "GalvInfo Center, \"Galvanizing 2022,\" GalvInfo Note, 2022", "sameAs": "https://www.galvinfo.com/wp-content/uploads/sites/8/2022/01/Galvanizing-2022.pdf" }, { "@type": "ScholarlyArticle", "@id": "#hotdipgalvanizing-intermetallic-layers-2026", "headline": "Hot Dip Galvanizing, \"High-Temperature Galvanizing (Delta Galvanizing): Process Characteristics and Standard Hot-Dip Galvanizing Alternatives,\" 2026", "sameAs": "https://www.hotdipgalvanizing.com/technical-resources/high-temperature-galvanizing-delta-galvanizing-process-characteristics-and-standard-hot-dip-galvanizing-alternatives" }, { "@type": "ScholarlyArticle", "@id": "#mustafa-laser-ablation-galvanized-2019", "headline": "Mustafa, H. et al., \"Effect of surface roughness on the ultrashort pulsed laser ablation of zinc, galvanized steel, and forming steel,\" Applied Surface Science, 2019", "sameAs": "https://ris.utwente.nl/ws/files/124566749/2019_MustafaH_ASS_ris.pdf" }, { "@type": "ScholarlyArticle", "@id": "#osha-zno-fume-pel-2025", "headline": "OSHA, \"Zinc Oxide, Dust & Fume — Chemical Data,\" Occupational Safety and Health Administration, 29 CFR 1910.1000 Table Z-1", "sameAs": "http://www.osha.gov/chemicaldata/215" }, { "@type": "ScholarlyArticle", "@id": "#pmc-metal-thermal-expansion-table", "headline": "PMC, \"Evolution of the Laser-Induced Spallation Technique in Film Adhesion Measurement,\" Table 1 — Material Properties, PMC 8208493", "sameAs": "https://pmc.ncbi.nlm.nih.gov/articles/PMC8208493" }, { "@type": "ScholarlyArticle", "@id": "#zhu-ns-laser-zinc-coating-2021", "headline": "Zhu, L., Gao, Q., Sun, B., Ke, Y., Tan, Y., Cao, Y., \"Nanosecond laser cleaning for enhanced zinc coating quality of HSLA steel,\" Optics & Laser Technology, vol. 143, 107311, 2021", "sameAs": "https://doi.org/10.1016/j.optlastec.2021.107311" } ] }