The main aim of this study was to analyze the pitting corrosion and stress corrosion cracking which is initiated on prototype cold-formed outer exhaust sleeves during the testing of different cleaning procedures before chromium plating. Various microscopic methods were used to identify the initiation of corrosion and its propagation.
- Severe corrosion occurred in the cleaning solution containing H2SO4 at elevated temperature.
- Pitting corrosion has formed on the titanium nitride inclusions.
- Stress corrosion cracking was caused by deformation martensite.