Home Forums General Discussion Shot Peening Process, Intensity, Coverage Does cast steel shot contaminate Aluminum?

I would advise to be careful with such combination. If any iron oxide is present in your shot you may have a fire risk (termite like reaction).

In AMS2430 section 3.5.4 it is specified that aluminum alloy peened with steel shot has to be cleaned with a suitable method. One option you could use is an etch dip.