Which method of corrosion control involves isolating the substrate from corrosive environments?

The method of corrosion control that involves isolating the substrate from corrosive environments is indeed barrier protection. This approach works by creating a physical layer or coating that prevents the corrosive agents, such as moisture, oxygen, or harmful chemicals, from coming into contact with the substrate material. By acting as a shield, the barrier reduces the risk of corrosion, thereby preserving the integrity and longevity of the substrate.

This method can include various coatings, such as paint or other protective layers, that adhere to surfaces, effectively sealing them off from the external factors that cause corrosion. The effectiveness of this approach depends on the integrity and quality of the barrier itself, as any breaches in the coating can lead to corrosion occurring underneath.

The other methods mentioned do not focus primarily on isolation. Inhibitive methods utilize chemicals that act to slow down the corrosion process, sacrificial methods involve using more reactive metals that corrode instead of the substrate, and reactive methods might involve techniques that alter the environment or the material properties to prevent corrosion. However, barrier protection remains distinct in its primary objective of physical separation to prevent corrosion from occurring.