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Determination of Moisture Content

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Record moisture to reduce corrosion

How Humidity Affects the Rate of Corrosion

Metal components and equipment tend to rust and corrode during storage, assembly or plant shut down due to moisture in the air. It corrodes at a much greater rate under humid conditions. This happens because the moisture-saturated air reacts with oxygen and electrons on the surface of the metal. The longer metal components are exposed to humid air, the faster they will generally corrode.

Corrosion does not occur is dry air. The basic problem arises from the fact that the invisible water vapour present in the air condenses, on any surface, colder than the dew point temperature of the surrounding air mass.

Also, sudden changes in temperature, within the room effect the internal humidity environment and lead to condensation on any surface. This subsequently leads to corrosion.

A moisture analyzer is a device that determines the moisture content with the loss on drying method and consists of a weighing and halogen heating unit.

Typically, moisture content is determined via a thermo gravimetric approach, i.e., by loss on drying, in which the sample is heated and the weight loss due to evaporation of moisture is recorded.

Moisture content is, simply, how much water is in a product. It influences the physical properties of a substance, including weight, density, viscosity, conductivity, and others. It is generally determined by weight loss upon drying.

DETECTION OF MOISTURE LEVEL IN ELECTRODES

The breakdown of water to Hydrogen and Oxygen during welding poses significant threats to the quality of the welds. Coatings of welding electrodes and fluxes readily absorb moisture. Moisture in the electrode may cause weld cracks and porosity.

The presence of these atoms in the weld would increase the risks of porosity, increasing the possibility of weld cracking. Determination of moisture content provides a means to verify that electrodes will not have significant moisture in them before the actual welding occurs.

DETECTION OF MOISTURE LEVEL IN METAL POWDER

Moisture content is how much water is in a product. It influences the physical properties of a substance, including weight, density, viscosity, conductivity, and others. It is generally determined by weight loss upon drying.

Atmospheric humidity is introduced into powders during handling, transportation, and storage. Therefore the surfaces of stored powder grains are always covered by adsorbed moisture. In this way, high moisture content can increase cohesive forces between particles and make it difficult to spread a powder into thin layers in powder bed processes or to fill a mould in processes such as press-and-sinter.

A Karl Fischer Titration is a device that determines the moisture content of samples after the samples are heated to release moisture. The Karl Fischer Titration method is much more accurate at low water levels than the traditional thermogravimetric method.

APPLICATION OF DETERMINATION OF MOISTURE CONTENT:

Real-time measurement of moisture content

Optimize powder processing conditions

Non-invasive, real-time measurement of moisture content

Optimize powder processing conditions

Common Test Methods

AWS A4.4

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Virtually all materials interact with water. Our expert chemical testing team can provide moisture content testing in our state-of-the-art laboratory. For more information, call us or send us an enquiry today.

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