Surface treatment chemicals for PWBs
What's OSP
OSP coating protects copper surface from oxidation to keep excellent solderability and plays a prominent role in component mounting process.
Basic information
Components
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Imidazole derivative
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Copper ion
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Organic acid
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Water
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OSP coating
OSP is an immersion coating process.
After 30 to 90 sec immersion, 0.2 to 0.3um thickness OSP coating forms on copper surface.
Functions, Demand characteristics
Functions of OSP
By Keeping excellent solderability, OSP acts as a bridge between PWB manufactures and assembly manufactures.
Demand characteristics of OSP (Example)
Excellent solderability
Good example
Copper surface covered by solder completely
Copper surface covered by solder completely
Bad example
Exposed copper
Exposed copper
OSP coating mechanism / OSP line
OSP coating forming mechanism (Theory)
Excellent solderability
Typical OSP process
