Boeing Sulfuric Acid (BSA)

Environmentally friendly protection for aviation products

Boeing Sulfuric Acid (BSA) anodizing is a chromium-free process developed by Boeing that complies with REACH regulations. This technique is designed as an alternative to chromic acid anodizing and provides optimal adhesion and corrosion resistance for aluminum products. As with chromic acid anodizing, a thin oxide layer forms, ensuring excellent adhesion for any subsequent paint system. 

We frequently apply BSA to aerospace components, particularly products that must meet high corrosion-resistance requirements, or when sulfuric acid anodizing is not suitable due to its impact on fatigue strength. 

Advantages of BSA anodizing: 

• Limited impact on fatigue strength 

• Optimal corrosion resistance 

• Excellent adhesion for primers and topcoats 

• Thin coating (2–7 µm), resulting in virtually no effect on dimensional tolerances 

BSA is primarily used for aerospace components, especially Boeing-related products. 

Standard specifications complied with:
BAC 5632 and MIL-PRF-8625 Type IC 

This process is certified by NADCAP and various OEMs. 

Curious whether BSA anodizing is the right solution for your project? We will be happy to advise you. 

Please contact our Sales department: sales@surfacetreatment.nl 

Maximum product dimensions:
Surface Treatment Netherlands: 3800 mm × 800 mm × 600 mm