Destructive Micro-Sectioning Protocols for Detecting Hyper Corrosion Spikes in ENIG
Destructive micro-sectioning with nitric acid etching isolates ENIG hyper-corrosion spikes under SEM to reject defective PCB lots before assembly.
PCB Failure Analysis
Meaning
Diagnostic investigative procedures identify the physical mechanisms that cause circuit assemblies to malfunction. Electronics manufacturers use pcb failure analysis to isolate solder joint cracking or trace delamination. Testing laboratories accredited by the CNAS carry out these examinations.
Regulatory Landscape
Domestic electronic products must comply with the compulsory certification framework administered by the Certification and Accreditation Administration of China (CNCA). In dispute resolution, an official report on pcb failure analysis from a licensed testing house provides the primary evidence in court. Unaccredited laboratory findings are usually inadmissible in these regulatory proceedings.
Laboratory Evaluation
Scanning electron microscopy exposes the grain structures of the fractured solder. Sectioning tools slice the circuit board to allow cross-sectional inspection of the internal copper layers under optical microscopes. Energy-dispersive spectroscopy determines the presence of chemical contaminants on the trace.
Cross-sectional microscopy then measures the thickness of the intermetallic compound layer. These step-by-step inspections identify the mechanical or thermal trigger of the failure.
Commercial Consequence
Contractual disputes between overseas buyers and domestic board suppliers frequently hinge on the allocation of blame for component failures. If the certified pcb failure analysis identifies design errors rather than manufacturing defects, the buyer must bear the replacement cost. This division of liability is binding under Chinese contractual law, which respects the technical findings of accredited national institutes.