SEAL Aviation

CADMIUM PLATING DEGRADATION WHAT IS IT?

Cadmium Plating helps protect metal and fasteners from corrosion. Corrosion is a natural phenomenon which attacks metal by chemical or electrochemical action and converts it into a metallic compound, such as an oxide, hydroxide, or sulfate. Corrosion is most often a slow process of material deterioration, taking place over a long period of time. Examples are general corrosion, pitting, stress-corrosion cracking, environmental embrittlement, and corrosion fatigue and exfoliation. Corrosion degradation can occur very quickly, in days or even hours, and with catastrophic results. Corrosion thrives on both the chemical and mechanical aspects of the environment and can cause catastrophic structural failure without warning. Cadmium as a coating protects steel parts and provides a compatible surface when a part contacts other materials. Attack on cadmium is evidenced by a white-to-brown-to-black mottling of the surface.
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