Last updated: April 10, 2019

What Does Hygroscopic Mean?

Hygroscopic refers to a matter's ability to adsorb and absorb water from the surrounding environment.

Some common examples of hygroscopic substances include:

  • Sodium chloride
  • Zinc chloride
  • Calcium chloride
  • Sodium hydroxide crystals

Hygroscopic substances are capable of causing corrosion in metals and other materials.


Corrosionpedia Explains Hygroscopic

Hygroscopic substances are capable of adsorbing and absorbing water from the surrounding area, leading to damage, and eventually, failure in various systems, equipment and machinery. Therefore, proper measures should be developed in order to inhibit corrosion. One method to analyze this is to accurately measure the humidity or the water vapor content present in the air using a hygrometer.

A hygrometer can be used to gauge not only the dimension of substance changes through water vapor absorption, but also other things such as physical and chemical property changes as well as vapor condensation.

Moreover, tests such as static loss of mass can be conducted in order to investigate the corrosive behavior of hygroscopic matter. With such, the hygroscopic substance is exposed to various corrosion inhibitor environments or solutions to determine the best way to inhibit hygroscopic corrosion. Finding the best inhibitor can significantly reduce the corrosive effects of hygroscopic substances.


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Materials SelectionScientific PropertiesSubstancesPhysical Property Water and Wastewater

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