Coating Verification
Plating thickness determination relies upon X-ray fluorescence spectrometry to quantify elemental mass per unit area without destroying plated components. Secondary photon emission analysis measures characteristic radiation from metallic layers on printed circuit board pads during incoming raw material inspection. Incident radiation excites core electrons within gold, nickel, or tin finishes, prompting subsequent photon release at energies unique to each element.
Detector electronics count these returning photons to establish deposit thickness against established calibration standards. Production engineers deploy the method to verify chemical bath performance before assembly lines commit expensive substrates to soldering operations.
Alloy Composition
Solder joint metallurgy verification utilizes X-ray fluorescence spectrometry to monitor tin and lead ratios or lead-free constituent proportions within bar solder and paste deposits. Incoming quality control laboratories run periodic checks on incoming paste lots to ensure solder compositions comply with stringent assembly reliability specifications. Elemental quantification identifies compositional drift within wave soldering pots before intermetallic compound growth causes brittle joint failures.
Precision measurement of minor dopants prevents thermal fatigue problems during subsequent operational lifecycles.
Trace Contamination
Foreign material screening on bare board surfaces employs X-ray fluorescence spectrometry to detect heavy metal residues left behind by chemical etching and plating processes. Quantitative elemental scans identify unexpected contaminants on copper foil traces prior to solder mask application and component placement. Residual etchants or metallic particulates disrupt electrical continuity and degrade dielectric performance if left unverified.
Analytical detection limits ensure cleanliness standards are met across complex multilayer architectures.
