Corrosion Susceptibility Testing Metallography Services for Aerospace & Oil & Gas 

Why Corrosion Susceptibility Metallography Matters 

In flight-critical and high-pressure systems, corrosion sometimes begins at microstructural triggers, grain-boundary carbides in stainless, MnS stringers in steels, sigma/chi or delta phases in Ni/SS, second-phase particles in aluminum, or flawed coating interfaces. Seeing these features early helps you validate heat-treat and weld practices, verify cleanliness and phase balance, and de-risk pitting, SCC, galvanic attack, and exfoliation before components reach service or fatigue testing. 

AADFW’s Approach: Precision, Speed, and Proof 

• Accredited & precise: Work performed under ISO/IEC 17025 with controlled prep, calibrated optics, and documented measurement procedures. 

• Faster results: Alloy-specific prep/etch plans and decision-ready photo plates compress lead times without sacrificing rigor. 

• Trusted by engineers: Clear acceptance call-outs tied to drawings/specs, location maps, and root-cause context that stands up to OEM and regulatory audits. 

Corrosion Susceptibility Metallography Service Capabilities 

• Targeted Sectioning & Mounting 
  Non-thermal sectioning at high-risk sites—weld toes/HAZ, first engaged threads, bearing lands, edges—and orientation marks for repeatable measurements. 

Preparation & Alloy-Specific Micro-Etching 

• Artifact-free grinding/polishing per ASTM E3; etchants per ASTM E407 tuned to objective: 
  • Stainless / Ni-base: reveal carbide precipitation, sensitization bands, sigma/chi/delta phases; assess grain-boundary chromium depletion indications. 
  • Steels: delineate MnS stringers/inclusion populations and banding that promote pitting/crevice initiations. 
  • Aluminum: reveal grain morphology/lamellae tied to exfoliation risk; assess intermetallic particle density. 
  • Titanium: identify alpha-case and surface condition impacting crevice/pitting initiation. 

Quantitative Microstructure Metrics 

• Grain size (ASTM E112), inclusion rating (ASTM E45), phase identification/percent area by image analysis, coating/overlay interface quality, porosity/voids at seal lines. 
• Microhardness & Gradients 
  Vickers/Knoop (ASTM E384/E92) traverses to profile hardened or depleted layers (e.g., alpha-case, decarburization) that elevate corrosion risk. 

Corrosion Test Corroboration (optional) 

• When exposure proof is required, we coordinate standardized tests and read-across results to metallography: 
  • Salt Spray (ASTM B117 / ISO 9227) for coating/finish screening. 
  • Pitting/crevice (ASTM G48) and exfoliation (ASTM G34) on applicable alloys. 
  • Reports integrate exposure outcomes with microstructural drivers for a complete picture. 
  • A262 is also available 

• Reporting & Traceability (Audit-Ready) 
  Photo plates with etchant/time and magnification, measurement tables, image-analysis overlays, hardness plots, acceptance summary (go/no-go), instrument & calibration references, and full chain of custody. 

Industries We Support 

• Aerospace: Weldments, fasteners, landing-gear steels, titanium structures, and Ni-base hardware—aligned to OEM/FAA expectations. 

• Oil & Gas: Pressure-boundary steels, weld overlays/cladding, and coated components where pitting, SCC, and sour-service risks are high. 

• Defense & Advanced Manufacturing: Mission-critical assemblies (including AM metals) requiring verified microstructure and corrosion resilience. 
  Trusted by engineers and QC managers across mission-critical industries. 

Accreditations & Standards Compliance 

AADFW operates to ISO/IEC 17025 and supports Nadcap-driven program requirements. We execute metallography to methods on our accredited scope and applicable customer/OEM specifications, including: 

• ASTM E3 (metallographic specimen preparation) 

• ASTM E407 (micro-etching) 

• ASTM E112 (grain size) • ASTM E45 (inclusion content) 

• ASTM E384 / E92 (microhardness for gradient profiling) 

• Corrosion corroboration as specified: ASTM B117 / ISO 9227, ASTM G48, ASTM G34 

• Additional AMS/OEM procedures when required by purchase documents 

Why Engineers Choose AADFW 

• Accredited & audit-ready metallography with quantified, defensible evidence. 

• Faster turnaround that keeps qualification and MRB gates on schedule. 

• Trusted partner to aerospace and oil & gas QA organizations. 

• Expert metallurgists who turn micrographs and spectra into clear go/no-go decisions and targeted corrective actions. 

Request a Quote for Corrosion Susceptibility Metallography Testing 

See the risks before they become failures. Request a Quote to schedule corrosion-susceptibility metallography today.