Porosity

Corrosion is an extremely costly and disruptive worldwide problem. The oxidation of metal (and concrete) surfaces, exposed by the breakdown or inadequacy of the applied protective coatings call for early detection to correct serious extension.

Surfaces requiring testing are generally expected to exhibit long life without maintenance, and are often difficult and very expensive to assess. Under these circumstances, it is essential that regular inspection, good measurement methods, and competent instruments are used, and accurate test results obtained, both before and after installation.

Increasingly, Porosity Detectors are employed in the non-destructive detection and location of pinholes (holidays), bare spots or thin points in protective coatings applied for corrosion protection over metal and concrete (conductive) surfaces.

PCWI manufactures both high and low voltage (wet sponge) instruments with a complete range of relevant accessories for such inspection and detection.

All instruments are battery-operated, passing the voltage output via a probe to an electrode. As the electrode moves over the coating surface, if it encounters a pinhole or bare spot, a small current flows activating a visible (non hazardous) spark at the point of contact and an audible and visible alarm in the unit.

For more than 30 years PCWI has been active in application, inspection and instrumentation for the coatings industry.

Realising that Porosity (Holiday) Detectors are a “working tool”, and as such must be operator friendly over extended inspection periods, PCWI several years ago commenced manufacturing lightweight technically advanced units to supersede the bulky and cumbersome units on offer. The PCWI® Compact Detector is the culmination of lengthy field experience and laboratory testing.

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