It have been reported that there could be up to 7-10% of residual grits on grit-blasted surface, the size of residual grits contamination area can be as big as 20 um. How to eliminate the residual grits contamination on grit-blasted low carbon steel surface?
Lech Pawlowski
How to remove is difficult to answer: maybe freezing down or heating up the sample? But, all the effects of grit-blasting will disappear and it should be repeated. I would try to change the grit and take harder material having greater particles. Or consider other methods of surface preparation such as waterjet.
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