Which process applies a micros coating on the metal surface that acts as a protective shield against corrosion?

Which process applies a micros coating on the metal surface that acts as a protective shield against corrosion?

• A. Anodizing
• B. Electroplating
• C. Passivation
• D. Painting

Answer: (C)

Forming a thin, highly adherent oxide film on the metal surface that acts as a barrier to moisture and oxygen. Passivation chemically promotes the development of this passive layer, which reduces the metal’s tendency to corrode. On stainless steel, for instance, a chromium oxide layer forms and provides corrosion resistance. This protective film is microscopic, unlike a paint layer or an added metal coating from electroplating, and it isn’t about changing the surface color or thickness in the same way as anodizing. Anodizing thickens the oxide on aluminum, while painting introduces a separate coating, and electroplating deposits a different metal. So the microscopic protective shield described is achieved through passivation.

Forming a thin, highly adherent oxide film on the metal surface that acts as a barrier to moisture and oxygen. Passivation chemically promotes the development of this passive layer, which reduces the metal’s tendency to corrode. On stainless steel, for instance, a chromium oxide layer forms and provides corrosion resistance. This protective film is microscopic, unlike a paint layer or an added metal coating from electroplating, and it isn’t about changing the surface color or thickness in the same way as anodizing. Anodizing thickens the oxide on aluminum, while painting introduces a separate coating, and electroplating deposits a different metal. So the microscopic protective shield described is achieved through passivation.