Premature corrosion of a substrate is usually due to a coating failure. A major cause is the presence of flaws in the finished coating. Collectively referred to as porosity, the main types of flaws are:
Wet Sponge Technique: A low voltage is applied to a moist sponge. When the sponge moves over a coating flaw, liquid penetrates to the substrate and completes an electrical circuit, setting off the alarm. The wet sponge technique is suitable for measuring insulating coatings less than 500μm (20mils) on conductive substrates, and is ideal for powder coatings and other coatings where the user does not wish to damage the coating.
High Voltage Technique: The high voltage, or porosity technique, can be used to test coatings up to 25mm (1”) thick and is ideal for inspecting pipelines and other protective coatings. Coatings on concrete can also be tested using this method.
The Elcometer 260 UV Pinhole Flashlight is battery powered and housed in a rugged aluminium case providing a quick, low cost method of testing coatings for pinholes.
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