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Developments in Testing Standards and Test Equipment for Discontinuities (Porosity) in Coatings

Developments in Testing Standards and Test Equipment for Discontinuities (Porosity) in Coatings
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Testing cured coatings for flaws and defects is often a crucial part of the acceptance process for a coating assessed against its specification. This is particularly the case for pipeline and storage tank coatings and for coatings applied for corrosion protection, where discontinuities in the coating can lead to premature failure. 

Product Number: 41208-416-SG
Author: John Fletcher
Publication Date: 2008
Industry: Coatings
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Testing cured coatings for flaws and defects is often a crucial part of the acceptance process for a coating assessed against its specification. This is particularly the case for pipeline and storage tank coatings and for coatings applied for corrosion protection, where discontinuities in the coating can lead to premature failure. Task groups within both ASTM and CEN (ISO) have been doing work on existing and new methods for low-voltage, wet-sponge testing and high-voltage “holiday” detection. Two ASTM test methods are being updated and a new test method is being developed within CEN for joint voting with ISO to also establish test sampling plans and acceptance/rejection criteria. The NACE recommended practise, RP0188 is also being considered for revision in 2007. This paper describes the new thinking in the area of porosity testing with particular reference to the selection of the correct test voltage for high voltage testing and the recent developments in the relevant test equipment.

Testing cured coatings for flaws and defects is often a crucial part of the acceptance process for a coating assessed against its specification. This is particularly the case for pipeline and storage tank coatings and for coatings applied for corrosion protection, where discontinuities in the coating can lead to premature failure. Task groups within both ASTM and CEN (ISO) have been doing work on existing and new methods for low-voltage, wet-sponge testing and high-voltage “holiday” detection. Two ASTM test methods are being updated and a new test method is being developed within CEN for joint voting with ISO to also establish test sampling plans and acceptance/rejection criteria. The NACE recommended practise, RP0188 is also being considered for revision in 2007. This paper describes the new thinking in the area of porosity testing with particular reference to the selection of the correct test voltage for high voltage testing and the recent developments in the relevant test equipment.

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