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Larson-Skold Index

Last updated: April 13, 2018

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:

Tendency to corrosion
< 0.2
No metal tendency
Light metal tendency
Low metal tendency
Mid metal tendency
=> 1.0
High metal tendency


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