Which term describes a non-electrolytic chemical treatment for aluminum alloys to increase corrosion resistance and paint-bonding qualities?

Which term describes a non-electrolytic chemical treatment for aluminum alloys to increase corrosion resistance and paint-bonding qualities?

• A. Anodizing
• B. Alodizing
• C. Chromating
• D. Passivation

Answer: (B)

Surface treatments for aluminum fall into electrolytic and non-electrolytic chemical coatings. Anodizing is electrochemical, using electric current to grow a protective oxide on the aluminum, which is great for corrosion resistance and paint adhesion but isn’t the non-electrolytic option described. The term that matches a non-electrolytic chemical coating designed to boost corrosion resistance and improve paint bonding on aluminum alloys is alodizing. It’s a chemical conversion coating applied without electricity, specifically aimed at protecting the surface and enhancing paint adhesion. Chromating is another chemical conversion option that can be non-electrolytic too, but the description points to alodizing as the term that best fits. Passivation focuses on forming a passive film to reduce corrosion, not primarily about paint bonding.

Surface treatments for aluminum fall into electrolytic and non-electrolytic chemical coatings. Anodizing is electrochemical, using electric current to grow a protective oxide on the aluminum, which is great for corrosion resistance and paint adhesion but isn’t the non-electrolytic option described. The term that matches a non-electrolytic chemical coating designed to boost corrosion resistance and improve paint bonding on aluminum alloys is alodizing. It’s a chemical conversion coating applied without electricity, specifically aimed at protecting the surface and enhancing paint adhesion. Chromating is another chemical conversion option that can be non-electrolytic too, but the description points to alodizing as the term that best fits. Passivation focuses on forming a passive film to reduce corrosion, not primarily about paint bonding.