Which statement about phosphate conversion coating is false?

Which statement about phosphate conversion coating is false?

• A. The porous surface created by phosphate coatings is less corrosion-resistant compared to bluing.
• B. Phosphate coatings can incorporate a lubricating element depending on the solution used.
• C. The color of the finish resulting from phosphate coatings depends on the solution used and part metallurgy.
• D. Phosphate conversion coating utilizes phosphoric acid to induce a reaction on the metal surface.

Answer: (A)