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February 26 - March 2, 2018

How long after blasting can stainless steel be left before painting? If this time is exceeded, what further surface preparation is required?

Selected Answers

From Warren Brand of Chicago Corrosion Group on March 8, 2018:
We treat blasting stainless the same way as blasting carbon steel. There are too many variables to keep track of, so err on the side of caution.

From John Brodar of Salt River Project on February 28, 2018:
Abrasive blast cleaning prior to painting serves two purposes: cleaning the surface and providing a suitable surface profile. When preparing new stainless steel to be painted, it is already clean, it simply needs a profile. In a sheltered location where atmospheric or wind-blown dust and debris do not settle on the stainless steel surface, the surface will not degrade for decades. Dust can be removed with clean blow-off air or vacuum. Mud can be removed with a Low Pressure Water Cleaning (LP WC), again decades after initial blast cleaning. Stainless steel corrodes so rapidly that moments after exposing fresh material, either from machining or abrasive blast cleaning, it forms such a tenacious, passive corrosive film that further corrosion does not occur (in a normal oxygen-rich environment). Feel free to wash this surface with clean water, blow off with clean air or vacuum to be followed with painting. Delay can be hours, days, weeks months or years. Of course, if a known contaminant is on this surface, such as oil or grease or diesel exhaust fumes, these must be removed but additional abrasive blast cleaning is not necessary.

From Erik Andreassen of CPS on February 27, 2018:
Your question should be more detailed. Blasting with what? Presumably, a garnet or a non-metallic abrasive.  Coating times are dependent on the climatic conditions. In a desert, for example, it could be hours, but in somewhere like Singapore or Malaysia with high humidity, it may be less than 1 hour. Follow the manufacturer's recommendations for the substrate to be coated and the product specified..

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Tagged categories: Abrasive blasting; Stainless steel; Surface preparation; Surface Preparation

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