Carbon Steel Laser Cleaning for Rust and Mill Scale
Pulsed 1064nm nanosecond fiber laser cleaning removes rust and adherent contamination from carbon steel at fluences of 2–5 J/cm² [1], but AMPP SP21511-1 (August 2024) establishes a...
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Todd DunningMSUnited States
Optical materials for industrial photonics systemsPublished
Apr 24, 2026
Antique Evinrude Outboard Shaft Drive Laser Cleaning
Laser cleaning removes rust, old paint, and corrosion from an antique Evinrude outboard shaft drive down to sound cast iron or bronze without touching the base metal. This rust removal work and paint removal strip the deposits layer by layer, but it will not repair worn seals, straighten a bent shaft, or restore a scored bore. Fit and running clearance still need a mechanical check after cleaning.
What This Video Shows
Short -mSvxhIuTuI shows pulsed laser clearing rust and old coatings from an antique Evinrude outboard shaft drive while steel and bronze stay in frame.
Metals that share the same shaft drive cleaning problem
Related contaminants
Iron oxide rust
Hydrated rust blocks primer adhesion until someone names the ISO grade on the plate. A pulsed 1064 nm pass strips the red film on [steel](/materials/steel-laser-cleaning) once mill scale is already gone. Coupon repetition-rate and fluence numbers stay on labeled plates, not on every shell or roller in the bay.
Mill scale and magnetite
Crews on hot-rolled plate with intact mill scale run four or five pulsed 1064 nm passes under HEPA because the magnetite laminate clears slower than field rust and Cal/OSHA caps iron oxide fume at 5 mg/m³. Thermoelastic spallation at the oxide-steel interface drives removal on [carbon steel](/materials/steel-laser-cleaning), not the same recipe as [field rust](/contaminants/iron-oxide-rust-laser-cleaning).
Paint and coatings
Bridge crews reach for HEPA before solvent when lead or chromate primers hide under aged topcoats, because BAAQMD cold-cleaner rules cap stripper VOC well below what commercial products carry. A pulsed 1064 nm pass removes organic films without a liquid hazmat stream, yet [oak](/materials/oak-laser-cleaning) and [concrete](/materials/concrete-laser-cleaning) test coupons on the same job do not inherit plate-[steel](/materials/steel-laser-cleaning) damage margins. Grit-profile recoats that demand ISO 8503 anchor tooth stay out of scope even when the visible coat is gone.
Organic grease and oil
Greasy steel and aluminum weld coupons need extraction bracketed before the pulsed pass. Cutting-fluid residue pyrolyzes at the lowest degrease energy band of any contaminant family on those joint faces, coupon work, not a production shell throughput claim.
Oxide scale
The crew names the alloy and the scale before touching the beam, hot-rolled magnetite on [carbon steel](/materials/steel-laser-cleaning) needs a higher coupon band than thin GTAW heat tint on [stainless](/materials/stainless-steel-laser-cleaning), and intact Grade A mill scale is not a standard pulsed-laser-cleaning target under AMPP practice. [Titanium](/materials/titanium-laser-cleaning) alpha-case and [Inconel](/materials/inconel-laser-cleaning) service oxide each carry a different damage ceiling at 1064 nm; coupon numbers stay on those plates, not as a fleet license on every shell.
Related applications
Rust removal — Bay Area
ISO 8501-1 Grade A mill scale is mechanical prep. Grades C–D field rust is the pulsed-laser job.
Weld prep cleaning
Mill scale on carbon steel joint faces is the direct source of the hydrogen that cracks high-strength welds, and pulsed laser cleaning is the only prep method that removes all of i...
Paint removal — Bay Area
A Bay Area coating shop can lift industrial film on a dry pulsed pass and stay under the 50 g/L VOC cap in BAAQMD 8-16-303.5. The repair cleaner never starts, so the solvent-usage...