Problems With Flash Rust on Castings After Blasting?May 22 2014, by Application Bulletins in
Flash Rust on Castings
Shot blasting of aluminum castings with steel shot can leave parts looking dull and dirty. Steel shot residue trapped on parts can also cause flash rust on castings. This leaves your castings with freckles of rust on the surface and in casting crevices. In periods of high humidity these freckles can appear overnight as the casting moves through subsequent machining, painting, or assembly steps.
Transmet Blast Media
Customers that have switched to Transmet Cast Aluminum Shot or Cast Zinc Shot have reported lower show usage, lower freight expense, lower inventory cost, and less dust produced and recycled.
Shot blasting with Cast Aluminum Shot leaves a brighter finish than steel:
Cast Zinc Shot has the mass for flash removal and deburring, leaving a brighter surface finish:
Blasting cast iron or other ferrous materials with Cast Zinc Shot leaves a 1-micron thick coating to temporarily prevent flash rust.
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