High-turnover ENIG plating lines generate latent intermetallic joint failures when bath aging drives nickel corrosion past IPC-4552B Level 1 limits.
Calibrating strain energy models requires measuring vacancy flux and creep energy density to prevent interfacial microvoid coalescence under thermal cycling.
Excessive intermetallic layer growth and Kirkendall voiding cause brittle solder joint field failures that require precise contractual latent defect rules.
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