Ni-Cr Plating on Diecastings: Blistering Fixes That Work

Summary for ni-cr plating on diecastings Discussion

Ni-Cr plating on diecastings is often troublesome because the substrate itself may be the root cause. The thread’s quickstart note says porous castings or those with cold shuts will usually blister, and unless diecasting quality is tightly controlled, the plater may need 100% inspection before plating. It also notes that diecastings generally need vibratory or other mechanical finishing before the chemical steps, and usually require copper plating before any other plating. In the specific question, a zinc cast part with copper and bright nickel showed blisters after four months. The reply attributed the problem mainly to cleaning: do a water-break test after the acid dip and rinse, and check whether water sheets properly; if a white paper towel leaves black residue, the part was not cleaned correctly. The overall message is that blistering can come from both poor casting quality and inadequate surface preparation.