Which statement about alodizing is correct?

Which statement about alodizing is correct?

• A. It is a thermal diffusion process
• B. It is a non-electrolytic chemical treatment to improve corrosion resistance and paint bonding
• C. It is an electroplating process for aluminum
• D. It is a mechanical finishing treatment

Answer: (B)

Alodizing is a chemical conversion coating applied to aluminum surfaces without using electricity. This non-electrolytic treatment forms a thin, adherent oxide film that enhances corrosion resistance and provides a better surface for paint bonding. It differs from anodizing, which is an electrochemical process that builds up a thicker oxide layer with current, and from electroplating, which deposits metal onto a surface. It also isn’t a mechanical finishing step. So the correct statement describes alodizing as a non-electrolytic chemical treatment that improves corrosion resistance and paint bonding.

Alodizing is a chemical conversion coating applied to aluminum surfaces without using electricity. This non-electrolytic treatment forms a thin, adherent oxide film that enhances corrosion resistance and provides a better surface for paint bonding. It differs from anodizing, which is an electrochemical process that builds up a thicker oxide layer with current, and from electroplating, which deposits metal onto a surface. It also isn’t a mechanical finishing step. So the correct statement describes alodizing as a non-electrolytic chemical treatment that improves corrosion resistance and paint bonding.