What Does
Larson-Skold Index Mean?
The Larson-Skold index refers to an empirical scale used to measure the degree of corrosiveness of water relative to mild steel metal surfaces. It is generated based on the in-situ corrosion of mild steel pipelines used to transport naturally occurring water from lakes and other freshwater sources.
Corrosionpedia Explains Larson-Skold Index
The Larson-Skold index is the ratio of twice the number of moles per liter (mol/L) of sulfate (SO42-) plus chlorides (Cl–), to the moles per liter of alkalinity that is typically in the form of bicarbonate and/or carbonate. The Larson-Skold index scale presents the following outcomes of corrosion tendency:
| LR |
Tendency to corrosion |
| < 0.2 |
No metal tendency |
| 0.4<LR=>0.2 |
Light metal tendency |
| 0.5<LR=>0.4 |
Low metal tendency |
| 1.0<LR=>0.5 |
Mid metal tendency |
| => 1.0 |
High metal tendency |