To create a surface profile (roughness) and chemical cleanliness. Why D2092 Was Replaced (Transition to D6386)
While the temptation to find a free copy online is understandable, the risks far outweigh the savings. Purchase the current standard directly from ASTM, study its methods, and apply them rigorously. Your paint adhesion—and your reputation—will thank you. astm d2092 pdf
The treatment passivates the zinc, stopping the formation of zinc oxides and carbonates. To create a surface profile (roughness) and chemical
Not legally from the official source.