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Fundamentals of Corrosion
and limit workers’ contact with hazardous materials. OSHA and the TSCA
make it necessary to use alternate coating materials and to modify application procedures in order to comply.
In the late 1940s, smoke control laws were enacted to reduce airborne
particulates that led to air pollution. During this period, a condition
known as “photochemical fog” developed as a result of increased automobile usage and industrial expansion. The fog was created by the reaction of
chemicals in the atmosphere to sunlight. Los Angeles County officials, recognizing that automobile exhaust and VOC (volatile organic compound)
emissions were major sources of smog, enacted an air pollution regulation
called Rule 66. Under Rule 66, specific solvents that produce photochemical smog were banned from use. At the same time, they published a list
of acceptable solvents that could be used in coatings. The EPA conducted
additional studies that indicated that these so-called “acceptable” solvents, given enough time, would also produce photochemical smog in the
atmosphere.
The EPA established national air quality standards (in its Clean Air Act of
1970 and its 1990 amendments) that regulate the amounts of solvents that can
be emitted. Many local standards are more stringent than the national standard. Consequently, specific coatings may not comply with regulations in all
areas. Waterborne, powder, high-solids, electropheric, and radiation-cured
coatings will comply in all areas.
In addition, certain types of paints, primarily those containing lead and
asbestos, have been outlawed by federal and local jurisdictions. Potentially
harmful pigments or other constituents are causing the restriction of other
paints containing these ingredients.
It is important that, during the application of any coating, adequate ventilation for the removal of solvents be provided, as well as suitable and safe
access to the work being painted.
7.7.1 application Methods
The method of application of a corrosion-resistant paint will depend on the:
1. Purpose for which coated product will be used
2. Environment to which the coating will be exposed
3. Type of paint
4. Shape and size of the object to be painted
5. Period of application process
6. Cost
Fundamentals of Corrosion
and limit workers’ contact with hazardous materials. OSHA and the TSCA
make it necessary to use alternate coating materials and to modify application procedures in order to comply.
In the late 1940s, smoke control laws were enacted to reduce airborne
particulates that led to air pollution. During this period, a condition
known as “photochemical fog” developed as a result of increased automobile usage and industrial expansion. The fog was created by the reaction of
chemicals in the atmosphere to sunlight. Los Angeles County officials, recognizing that automobile exhaust and VOC (volatile organic compound)
emissions were major sources of smog, enacted an air pollution regulation
called Rule 66. Under Rule 66, specific solvents that produce photochemical smog were banned from use. At the same time, they published a list
of acceptable solvents that could be used in coatings. The EPA conducted
additional studies that indicated that these so-called “acceptable” solvents, given enough time, would also produce photochemical smog in the
atmosphere.
The EPA established national air quality standards (in its Clean Air Act of
1970 and its 1990 amendments) that regulate the amounts of solvents that can
be emitted. Many local standards are more stringent than the national standard. Consequently, specific coatings may not comply with regulations in all
areas. Waterborne, powder, high-solids, electropheric, and radiation-cured
coatings will comply in all areas.
In addition, certain types of paints, primarily those containing lead and
asbestos, have been outlawed by federal and local jurisdictions. Potentially
harmful pigments or other constituents are causing the restriction of other
paints containing these ingredients.
It is important that, during the application of any coating, adequate ventilation for the removal of solvents be provided, as well as suitable and safe
access to the work being painted.
7.7.1 application Methods
The method of application of a corrosion-resistant paint will depend on the:
1. Purpose for which coated product will be used
2. Environment to which the coating will be exposed
3. Type of paint
4. Shape and size of the object to be painted
5. Period of application process
6. Cost