Problem: Why there are stains on parts?
Probable cause/solution: a) inadequate rinsing; b) parts not dry; or c) improper packing (pack with desiccant or under nitrogen).
Problem: The parts are pitted
Probable cause/solution: a) suspended solids in the bath; b) loading ratio too high; c) organic and metallic contamination; or d) poor hydrodynamics in the bath.
Problem: The parts are dull and cosmetically dark
Probable cause/solution: a) old bath; b) presence of organic and inorganic contaminants; c) low nickel and hypo; d) low temperature; e) low pH; f) inadequate surface preparation; or g) contaminated rinses.
Problem: The plating is streaky or patterned
Probable cause/solution: a ) poor agitation; b) poor surface preparation; c) metallic contamination; d) residues on surface; or e) gas pattern due to reactions.
Problem: The bath is unstable
Probable cause/solution: a) high temperature; b) high pH; c) local overheating; d) plating tank not passivated properly; e) airborne particles; or f) large additions to bath.