Learn about quality inspection methods for surface treatments. Discover visual inspection, thickness measurement, adhesion testing, and documentation requirements.
Introduction
Quality inspection ensures surface treatments meet specifications. At Fulei Metal, our inspection protocols cover all aspects of coating quality.
Inspection Methods
Visual Inspection
First and most important inspection. Checks: color match, uniform appearance, complete coverage, surface defects (orange peel, pinholes, fish eyes), cleanliness, overall quality. Performed under adequate lighting. 100% of parts visually inspected.
Thickness Measurement
Magnetic induction for magnetic substrates (steel). Eddy current for non-magnetic substrates (aluminum). XRF for multi-layer or precision measurement. Calibrated gauges required. Minimum 3-5 points per significant surface.
Adhesion Testing
Cross-cut test (ISO 2409). Tape test (ASTM D3359). Bend test. Impact test. Destructive tests on samples. Non-destructive where possible.
Corrosion Testing
Salt spray (ISO 9227). Humidity (ISO 6270). Cyclic corrosion. Performed on witness samples. Duration per specification.
Hardness Testing
Pencil hardness (ASTM D3363) for powder coating. Micro-hardness for hard anodizing. Hard chrome hardness verification.
Quality Standards
ISO 9001
Quality management system. Documented procedures. Process control. Traceability. Continuous improvement.
Industry-Specific
Qualicoat: architectural powder coating. GSB: German quality standard for powder coating. Qualanod: architectural anodizing. AAMA: American architectural standards.
Inspection Frequency
First Article
100% inspection of all characteristics. Full documentation. Client approval if required. Verifies setup and process.
In-Process
Visual inspection: 100%. Thickness: sample every 10-20 parts. Adhesion: periodic (daily/weekly). Corrosion: periodic (monthly/quarterly).
Final
100% visual. Sample thickness measurement. Verify all requirements met. Prepare documentation.
Documentation
Inspection records: date, part, operator, results. Thickness measurements: actual values at each point. Adhesion test results: rating and method. Corrosion test results: duration and outcome. Certificates: material, process, quality. Reports provided to clients.
Acceptance Criteria
Visual
Color matches approved sample. Uniform appearance. No defects exceeding limits. Complete coverage. Clean surface.
Thickness
Average meets or exceeds minimum. No single point below minimum minus tolerance. No point exceeds maximum. Meets relevant ISO standard.
Adhesion
Cross-cut: Grade 0 or 1. Tape: no coating removal. Bend: no cracking.
Corrosion
Specified duration with no rust. No blistering. No adhesion loss. Per applicable standard.
Conclusion
Quality inspection ensures surface treatments meet specifications and perform as expected. At Fulei Metal, our comprehensive inspection and documentation provide confidence in coating quality.