📌 HVAC Painted Steel Bracket - Fretting corrosion in fertilizer dust

Industry: HVAC · Severity: Critical · Mechanism: Fretting corrosion · Risk: 91/100

🧾 Summary

A painted steel bracket used in a hvac application shows fretting corrosion risk after exposure to fertilizer dust. The design review focuses on material pairing, geometry, coating coverage, inspection access, and realistic validation testing.

⚠️ Design Risk

Likely weak points include local electrolyte retention, incompatible material pairing, coating discontinuities, trapped debris, and missing acceptance criteria for corrosion validation.

🛠️ Recommended Controls

Recommended controls: drainage path redesign, sacrificial element review, and coating specification upgrade. Add drawing notes, supplier evidence requirements, and a validation plan that reflects the expected service environment.

🎓 Learning Notes

Learners should identify the corrosion mechanism, estimate severity, and decide whether prevention should come from material change, coating change, geometry change, sealing, isolation, or inspection planning.