While the term 'plasma oxidation' typically refers to oxidation processes involving a plasma state (ionized gas), the provided reference describes a different, though related, method for creating oxide layers on metals called electrolytic anodizing. This process uses a liquid electrolyte rather than a plasma. Let's explore how this electrolytic anodizing process works based on the information given.
Understanding Electrolytic Anodizing According to the Reference
The reference [14] outlines the core mechanism and application of this specific oxidation technique.
The Core Mechanism
According to the provided information:
- A uniform voltage or current is employed between the two electrodes in an electrolytic solution.
In this setup, the metal object to be oxidized acts as the anode, placed in a conductive liquid called an electrolyte. Applying an electrical potential difference drives chemical reactions at the metal surface.
The Outcome
The primary result of this electrochemical process is the formation of a protective or functional oxide layer:
- The technique is used to produce a thick oxide layer on the metal anode substrate. This controlled oxidation creates a layer much thicker and often more durable than the naturally occurring oxide film.
Historical Context
The reference provides a historical example illustrating the significance and early industrial adoption of anodizing:
- Anodizing was initially employed on an industrial scale during 1923 to safeguard aluminum-built seaplanes from corrosion [14]. This demonstrates its long-standing use for protecting metals exposed to harsh environments.
Based only on the provided reference, electrolytic anodizing works by applying an electric current or voltage in an electrolytic solution to grow a substantial oxide layer on a metal substrate, a method historically proven effective for corrosion protection.
