Problem: EN plating solution is murky and cloudy
Probable cause/solution: a) pH too high; add H2SO4 to lower pH; b) excessive drag-out losses; or c) complexing agents may be low, which can be replenished by addition of make-up additive.
Problem: Rapid changes in bath pH observed
Probable cause/solution: a) excessive drag-in of pretreatment chemicals, which can be improved by efficient rinsing; b) loading factor high; decrease work load; or c) improve buffering action to control pH.
Problem: Workload exhibits patchy step plating or skip plating
Probable cause/solution: a) metallic contamination; b) the substrate effect due to lead content; the skip plating can be corrected using a copper or nickel strike; c) over-stabilized bath (do dummy plate or dilute the bath); or d) incorrect pH.
Problem: No deposition on the work is observed
Probable cause/solution: a) solution is out of balance; b) contamination by foreign materials; c) pH too high; d) bath is excessively heated; e) over-stabilized bath- dilute bath; or f) low pH and temperature.
Problem: Plated parts are rough
Probable cause/solution: a) faulty surface preparation; b) drag of suspended solids; c) improper cleaning and rinses; d) pH too high; e) inadequate Ni chelation; or f) contamination from multiple sources such as water, rinses, oils, dirty filters, liners and airborne shop dust.
Problem: Non-uniform or skip plating on the parts
Probable cause/solution: a) imbalance in stabilizers or accelerators; b) rust on parts; improper pretreatment; or c) excessive stabilizer levels, which can cause pull back or no plate on edges. All these problems can be corrected by maintaining chemistry in optimal ranges and adequate pretreatment. Imbalance in chemistry is also the root cause of variability in appearance of parts being too dull or too bright. A well-established bath yields good parts. Stains on parts can be prevented with good rinses and adequate drying.
Problem: Flaking of plating film observed at random?
Probable cause/solution: Peeling or flaking is usually due to improper cleaning or activation of substrates. The importance of pretreatment cannot be overemphasized. Matching the proper cleaning and activation processes for the type of metal and the manufacturing method are the prerequisites to having a robust process to handle variations in soils and oils left on the part.
Problem: EN plating solution is murky and cloudy
Probable cause/solution: a) pH too high; add H2SO4 to lower pH; b) excessive drag-out losses; or c) complexing agents may be low, which can be replenished by addition of make-up additive.
Problem: Rapid changes in bath pH observed
Probable cause/solution: a) excessive drag-in of pretreatment chemicals, which can be improved by efficient rinsing; b) loading factor high; decrease work load; or c) improve buffering action to control pH.
Problem: Workload exhibits patchy step plating or skip plating
Probable cause/solution: a) metallic contamination; b) the substrate effect due to lead content; the skip plating can be corrected using a copper or nickel strike; c) over-stabilized bath (do dummy plate or dilute the bath); or d) incorrect pH.
Problem: No deposition on the work is observed
Probable cause/solution: a) solution is out of balance; b) contamination by foreign materials; c) pH too high; d) bath is excessively heated; e) over-stabilized bath- dilute bath; or f) low pH and temperature.
Problem: Plated parts are rough
Probable cause/solution: a) faulty surface preparation; b) drag of suspended solids; c) improper cleaning and rinses; d) pH too high; e) inadequate Ni chelation; or f) contamination from multiple sources such as water, rinses, oils, dirty filters, liners and airborne shop dust.
Problem: Non-uniform or skip plating on the parts
Probable cause/solution: a) imbalance in stabilizers or accelerators; b) rust on parts; improper pretreatment; or c) excessive stabilizer levels, which can cause pull back or no plate on edges. All these problems can be corrected by maintaining chemistry in optimal ranges and adequate pretreatment. Imbalance in chemistry is also the root cause of variability in appearance of parts being too dull or too bright. A well-established bath yields good parts. Stains on parts can be prevented with good rinses and adequate drying.
Problem: Flaking of plating film observed at random?
Probable cause/solution: Peeling or flaking is usually due to improper cleaning or activation of substrates. The importance of pretreatment cannot be overemphasized. Matching the proper cleaning and activation processes for the type of metal and the manufacturing method are the prerequisites to having a robust process to handle variations in soils and oils left on the part.
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