Passive Oxide Layer

Definition

The protective oxide film on metal surfaces that resists corrosion and can be disrupted by corrosive anions like chloride and sulfate.

Chloride is a corrosive anion that disrupts this protective oxide layer, increasing corrosion of metal surfaces. Sulfate is likewise considered corrosive. Protecting or maintaining this layer is a central goal of corrosion control, achieved through inhibitor strategy, pH control, and metallurgy selection.

Related concepts

pH Control · Corrosion Concerns

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Part of The Blueprint of Water · ⚡ electrochemistry