Corrosion Control by Material selection & Metallic Coating
Material Selection and Metallic Coating for Corrosion Control describes how metals coatings can prevent corrosion from metal corrode.
Corrosion control is a process aimed at reducing the corrosion rate to a tolerable level (or predictable limits). This process consists of different corrosion monitoring and control techniques, used by industries to reduce the problem of corrosion.
Corrosion control focuses mainly on
- (1) Material and
- (2) Environments
Corrosion Management focuses on “people” and aims at improving the performance of engineering systems. So, effective corrosion control requires a complete management strategy involving people as much as equipments.
Since corrosion involves interaction between material and environment, the approach to control corrosion includes
- Use of the most compatible material in a given environment.
- Reduce the aggressiveness of the environment towards the material.
- Use of protective coating to separate the material from the environment.
- Cathodic and anodic protection are preventive measures based on electrochemical principles of corrosion.
Methods of Corrosion Control
- Material Selection
- Modification of the environment(inhibitors)
- Electrochemical Methods
2. Material Selection:
- Technically, selecting a corrosion – resistant alloy would be the answer to corrosion problem
- However, corrosion resistance is not the only property to be considered when selecting a material. (It is of major importance in the chemical process industries).
- Economics (cost) dictate the selection of material.
- The most corrosion – resistant metal or alloy may not be always optimum choice because of:
1) High Cost.
2) Low abundance
3) Difficult to manufacture
4) Unsuitability to meet the engineering requirement.
- The materials selection process is also influenced by weather the material is to be used for: