Corrosion properties of AISI 321 stainless steel

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.

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