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Fundamentals of Corrosion
1. Materials selection
2. Environment and inhibitors
3. Coatings and linings
4. Cathodic protection or sacrificial materials
5. Special procedures such as plant and physical layout or the control
of process variables
11.3.3.1 Chemical Industry
Those responsible for the selection of materials of construction are normally
materials or corrosion engineers. Materials other than metal are widely
used in the chemical industry, so the engineer must know the technical and
scientific information with regard to the deterioration of plastics, graphite,
wood, rubber, concrete, elastomeric materials, roofing materials, coatings,
linings, glass, brick, and mortars, among the many materials used in the
chemical industry.
In addition to the production and manufacture of chemicals, the industry
also includes pharmaceuticals, fertilizers, mining, and metal extraction. The
similarities among these different sectors of the industry lie in the handling
of liquids, solids, and gases. There is also the handling of acids, bases, and
salts, both inorganic and organic. There is a need in most cases to maintain the purity of the product, or the avoidance of corrosion in the product.
Economy demands a maximum lifetime of processing equipment at minimum cost, with minimum labor requirements in both the operation and the
maintenance of the plant.
The methods of corrosion control include:
1. Materials selection
2. Environmental changes, inhibitors
3. Coverings or liners
4. Design improvements
5. Specifications for purchasing and/or contractors
6. Regular inspection and improved techniques
Materials selection. By upgrading to the proper materials of construction, one
can often avoid or at least minimize the effect of a given environment. Many
tables are available giving the resistance of various materials of construction in
various environments. This includes miscellaneous materials such as glass. Not
that glass is the ultimate material of construction, but it does have a wide range
of chemical resistance to all strongly acidic conditions including hydrochloric
acid. Glass has been developed that is armorized to overcome its brittleness.
Fundamentals of Corrosion
1. Materials selection
2. Environment and inhibitors
3. Coatings and linings
4. Cathodic protection or sacrificial materials
5. Special procedures such as plant and physical layout or the control
of process variables
11.3.3.1 Chemical Industry
Those responsible for the selection of materials of construction are normally
materials or corrosion engineers. Materials other than metal are widely
used in the chemical industry, so the engineer must know the technical and
scientific information with regard to the deterioration of plastics, graphite,
wood, rubber, concrete, elastomeric materials, roofing materials, coatings,
linings, glass, brick, and mortars, among the many materials used in the
chemical industry.
In addition to the production and manufacture of chemicals, the industry
also includes pharmaceuticals, fertilizers, mining, and metal extraction. The
similarities among these different sectors of the industry lie in the handling
of liquids, solids, and gases. There is also the handling of acids, bases, and
salts, both inorganic and organic. There is a need in most cases to maintain the purity of the product, or the avoidance of corrosion in the product.
Economy demands a maximum lifetime of processing equipment at minimum cost, with minimum labor requirements in both the operation and the
maintenance of the plant.
The methods of corrosion control include:
1. Materials selection
2. Environmental changes, inhibitors
3. Coverings or liners
4. Design improvements
5. Specifications for purchasing and/or contractors
6. Regular inspection and improved techniques
Materials selection. By upgrading to the proper materials of construction, one
can often avoid or at least minimize the effect of a given environment. Many
tables are available giving the resistance of various materials of construction in
various environments. This includes miscellaneous materials such as glass. Not
that glass is the ultimate material of construction, but it does have a wide range
of chemical resistance to all strongly acidic conditions including hydrochloric
acid. Glass has been developed that is armorized to overcome its brittleness.