What stainless steel alloys prevent pitting in acid rain?

Acid rain poses a significant threat to metals, causing pitting corrosion that weakens structural integrity. To combat this, specific stainless steel alloys are engineered for superior pitting resistance. The most effective options include:

1. 316L Stainless Steel – Contains molybdenum (2-3%) for enhanced resistance to chlorides and acidic environments.

2. 2205 Duplex Stainless Steel – A blend of austenitic and ferritic steel with high chromium (22%) and molybdenum (3%), ideal for harsh conditions.

3. 904L Stainless Steel – Offers exceptional resistance due to high nickel and copper content, often used in chemical processing.

4. 254 SMO (6Mo Super Austenitic) – Contains 6% molybdenum, making it highly resistant to aggressive acids.

These alloys form a passive oxide layer that prevents acid penetration, ensuring durability in corrosive environments. For long-term performance in acid rain, 316L and 2205 are the most cost-effective choices.