Thermoforming
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PSU Must Be Annealed Before Plating
Problem Phenomenon
[Problem Phenomenon] PSU plated parts have poor coating adhesion, blistering and peeling
Cause Analysis
PSU can be electroless-plated with nickel and copper and vacuum coated, but all molded parts must be annealed before plating to eliminate internal stress; stress of unannealed parts is released in the plating bath causing coating failure
Solution
Treat products per the annealing procedure before plating; use electroless nickel or copper process as a base; execute vacuum coating per standard equipment process and verify adhesion; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Annealing before PSU plating is a hard rule; if stress is not removed, the coating will surely fail; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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