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September 15 - September 19, 2014

The literature indicates that UHP waterjetting produces a profile on steel, although of a micro nature. Is this sufficient roughness for good adhesion of thin-film primers?

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Selected Answers

Yes, the profile produced by UHP waterjetting is sufficient for good adhesion of thin-film primers, in the range of  25-40 microns DFT.

From Lydia Frenzel of Advisory Council on October 18, 2014:
Yes, it is good for coatings. However, the major profile which you see after UHP waterjetting (Hydroblasting) is the profile left by the original abrasive blasting. Visualize the removal of slivers of steel or embedded abrasive particles, or the washing away of residual sand dust. In the normal course of events, pressure washing, high pressure water blasting, and UHP waterjetting reveal the profile that is under the coating or corrosion. It removes the old paint. If that profile is suitable for the paint, then paint over it. When the water jetting pressure is above theshhold pressure limit, then it can profile the metal. See VanKuiken, US patents for Aluminum. The coatings wet and adhere much better than over solid abrasive profiles. The companies who make profiles on small metal parts with only use water with robotic control to keep the profile consistent.

From robert turner of Newport News Shipbuilding on October 10, 2014:
Coating thickness does play a role. For instance, if it is heat- resistant aluminum paint applied at much less than 1 mil, it may be appropriate. But if it is an epoxy coating that goes on at 4-6 mils, then no. There are a lot of other factors that go into this, such as service environment (hot/cold/ambient, immersion, weathering, etc.) and the coating applied. In short, one must evaluate a myriad of factors.

From gilbert urma of HHIC-phil on October 7, 2014:
The profile produced by UHP water jetting is the best for thin-film coatings because the substrate's peak will be coated.

From Francis Goss of Rienecker Projektmanagement on October 2, 2014:
It depends on the product. It is best to consult the manufacturer of the paint you plan to use.

From ramon mccloskey of realisticlondonltd on September 25, 2014:

From Warren Brand of Chicago Coatings Group on September 19, 2014:
Short and sweet (I hope I'm right.): no.

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Tagged categories: Coating / Film thickness; Surface preparation; Surface profile; UHP waterjetting

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