Micrometre per Year (µm/y)
The micrometre per year is 0.001 mm/y, used for slow corrosion such as atmospheric corrosion of zinc and steel (ISO 9223 corrosivity categories).
Symbol: µm/y (ASCII: um/y)
Quantity: corrosion rate (thickness loss per year)
SI relation: 1 µm/y = 0.001 mm/y (exact)
Derivation: 1 µm/y = 0.001 mm/y
Exact: yes, by definition
Typical uses
- Atmospheric corrosion and galvanised coating life
- Corrosivity categories C1–CX
- Low-rate laboratory measurements
Convert micrometres per year to other units
| Conversion | 1 µm/y equals | Reverse |
|---|---|---|
| micrometre per year to millimetre per year | 0.001 mm/y | millimetre per year to micrometre per year |
| micrometre per year to mil per year | 0.03937007874 mpy | mil per year to micrometre per year |
| micrometre per year to inch per year | 0.00003937007874 ipy | inch per year to micrometre per year |
Open the Corrosion Rate Converter to convert any value between all units.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology .
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Micrometre per Year (µm/y). Retrieved October 25, 2026, from https://scientificconverters.com/units/micrometer-per-year/
IEEE
Scientific Converters, "Micrometre per Year (µm/y)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/micrometer-per-year/