Brass Laser Cleaning
Brass hardware and fixtures can shed tarnish and old lacquer with a dry laser pass when energy stays on the soil and zinc is not driven out of the surface. Acid dips are the usual...
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Yi-Chun LinPh.D.Taiwan
Materials characterization for industrial surfacesPublished
Apr 28, 2026
Antique Cash Register Restoration with Laser Cleaning
A laser cleaning system removes decades of tarnish, lacquer residue, and grime from an antique cash register in minutes, restoring the brass drawer front and nickel-plated keys without harming the original finish underneath. The pulsed beam vaporizes surface oxidation and old coatings layer by layer, so it suits the ornate scrollwork many registers carry, the kind of fine detail that cleaning tarnished brass fittings depends on getting right. It also handles the cast iron base and steel mechanism, since the same non-contact method adapts easily when removing old paint layers from a cabinet panel. What it will not do is repair dented sheet metal, replace missing keys, or fix a jammed mechanism, and it will not touch printed decals or paper labels, since lingering heat can scorch them. A trained technician still checks fluence settings before running a full pass, because factory-original nickel plating is thinner than modern replating and can dull if pushed too hard.
What This Video Shows
Short G5USK_IL8Xk (42 s) shows pulsed fiber laser cleaning on an antique cash register so paint, rust, and grime leave detailed brass while engravings stay readable.
Equipment Used
- Pulsed fiber laser cleaning system
Brass, cast iron, walnut, and tool steel on this register
Related Contaminants
Hard Coatings Laser Cleaning
Stripping a PVD or CVD hard coating from tool steel is a narrow band, since about 2–4 J/cm² removes the coating while 8–12 J/cm² injures the host steel. Bay Area tool remanufacturers should treat a glossy flank face as a screening test only, because recoating contracts need a chemical strip-complete criterion.
Clear Atmospheric Rust Without Cooking the Steel
Iron oxide rust is removed from [steel](/materials/steel-laser-cleaning) at **0.1–0.5 J/cm²**, well under the **8–15 J/cm²** where the base metal starts to take damage, so a coupon cut from the actual part, not the color of the rust or any [mill scale](/contaminants/mill-scale-magnetite-laser-cleaning) under it, should set the energy.
Laser Cleaning Paint Coatings Without Hurting the Surface
Paint coatings come off [stucco](/materials/stucco-laser-cleaning) at 0.5–2 J/cm², while the stucco itself is injured at 8–14 J/cm², so a setting that removes paint has to stay near the low end of that range. The same logic runs through [laser paint coating removal](/applications/laser-paint-coating-removal-bay-area) on any host.
Heat-Treated Oxide Scale laser cleaning
Stainless steel carrying oxide scale leaves a narrow margin, with scale coming off at 1.5–4 J/cm² and damage to the stainless itself starting at 5–12 J/cm², while on hot-rolled carbon steel AMPP SP21511-1 says pulsed laser ablation will not productively remove intact mill scale, so the metal and the scale condition decide whether laser cleaning is the right tool.
Galvanized Zinc Laser Cleaning for Galvanization Removal
Laser cleaning removes galvanizing from steel at **1–4 J/cm²**, but at **8–15 J/cm²** the beam starts to damage the [zinc](/materials/zinc-laser-cleaning) and the steel under it, so the fluence you set decides what survives.
Weld Heat Tint Laser Cleaning
Laser cleaning removes weld heat tint from stainless steel at 0.5–1.5 J/cm², but 5–12 J/cm² injures the metal underneath, and a clean look does not prove corrosion resistance returned.
