That is correct. This is the theory behind anodising aluminium (although aluminum oxide also exhibits excellent thermal insulation properties)supasupa said:that makes sense... what you are saying is the oxide around the steel (rust) slows down the corossion rate
Corrosion of steel refers to the process of the gradual destruction of steel due to chemical reactions with its environment, leading to a decrease in its strength and durability.
The main factors that contribute to the corrosion of steel are the presence of water, oxygen, and electrolytes (such as salt), as well as the pH level and temperature of the environment.
The equilibrium state in the corrosion of steel refers to the point at which the rate of corrosion equals the rate of protection, resulting in a steady state where the steel is neither gaining nor losing mass.
The rate drop phenomenon refers to the sudden decrease in the rate of corrosion that occurs after the initial stages of corrosion. This is due to the formation of protective layers on the surface of the steel that slow down the corrosion process.
The rate drop phenomenon can be explained by the formation of passive layers on the surface of the steel, which act as a barrier against further corrosion. This can occur through the formation of oxides, carbonates, or other compounds depending on the environment.