Corrosion and Its Theories

Flashcards summarizing key concepts related to corrosion, its types, factors affecting it, and theories explaining its mechanisms.

Corrosion

Destruction or deterioration of a material due to a reaction with its environment, typically involving metals.

Rusting

The process in which iron reacts with moisture and oxygen to form iron oxides.

Factors Affecting Corrosion

Environmental conditions, nature of metal, and mechanical stress which influence the rate of corrosion.

Weight Loss Method

A technique to measure corrosion by noting the weight change of a metal sample exposed to a corrosive environment.

Crevice Corrosion

Localized corrosion that occurs in gaps or crevices where ionic concentration differs.

Stress Corrosion Cracking (SCC)

Cracking of a metal due to simultaneous action of tensile stress and a corrosive environment.

Galvanic Corrosion

Corrosion that occurs when dissimilar metals are in contact within an electrolytic environment.

Pitting Corrosion

Localized corrosion forming small holes or pits on the metal surface, often hard to detect.

Microbial Corrosion

Corrosion caused by microorganisms, influencing the rate of degradation of metals.

Dry or Chemical Theory of Corrosion

Corrosion due to a direct chemical reaction between a metal and gas in the atmosphere without the presence of moisture.

Galvanic or Electrochemical Theory of Corrosion

Corrosion explained by the electrochemical cell formed when two dissimilar metals are in contact in the presence of an electrolyte.