Corrosion of Paint
251
Recommended systems are B, C, and E in Table 7.15.
7.9.5 area 5: Saltwater Exposure
This area includes interior or exterior locations on or near a seacoast or
industrial environments handling brine or other salts. Under these conditions, the surfaces are frequently wetted by saltwater and include condensation, splash, or spray.
Conditions in this area are essentially the same as for freshwater and the
comments for Area 4 apply here. Because of the more severe conditions, it
is recommended that two coats of the primer be applied for system E in
Table 7.13 and system A in Table 7.15.
Recommended systems are B, C, and E in Table 7.13 and A in Table 7.15.
7.9.6 area 6: Freshwater immersion
Wastewaters are also a part of this area. Included are all areas that remain
underwater for periods longer than a few hours at a time. Potable and nonpotable water, sanitary sewage, and industrial waste liquids are all included.
If the systems recommended are to be used as tank linings, it is important
that the application be performed by experienced workers. In addition, if the
coating to be applied will be in contact with potable water, it is important
that the material selected meets the necessary standards and is approved for
use by the health department. Two coats of epoxy (system D in Table 7.14) are
frequently used in this service.
Recommended systems are F in Table 7.13 and A, D, and E in Table 7.14.
7.9.7 area 7: Saltwater immersion
Areas that remain underwater in a coastal environment or industrial area or
that are constantly subjected to flowing salt or brine-laden water are included
in this category. Because of the increased rate of corrosion, a third coat may
be added to system F in Table 7.13 and systems A and E in Table 7.14 as additional protection against this more severe corrosion.
System D in Table 7.13 and systems A, E, and F in Table 7.14 are recommended for this service.
7.9.8 area 8: acidic Chemical Exposure (pH 2.0–5.0)
In the chemical process industries, this is one of the most severe environments encountered. When repainting, it is important that all surfaces are
clean of any chemical residue. Inorganic zinc and zinc-filled coatings are not
recommended for application in this area.
The system selected will be based on the quality of surface preparation,
length of chemical exposure, and housekeeping procedures. Decreased
251
Recommended systems are B, C, and E in Table 7.15.
7.9.5 area 5: Saltwater Exposure
This area includes interior or exterior locations on or near a seacoast or
industrial environments handling brine or other salts. Under these conditions, the surfaces are frequently wetted by saltwater and include condensation, splash, or spray.
Conditions in this area are essentially the same as for freshwater and the
comments for Area 4 apply here. Because of the more severe conditions, it
is recommended that two coats of the primer be applied for system E in
Table 7.13 and system A in Table 7.15.
Recommended systems are B, C, and E in Table 7.13 and A in Table 7.15.
7.9.6 area 6: Freshwater immersion
Wastewaters are also a part of this area. Included are all areas that remain
underwater for periods longer than a few hours at a time. Potable and nonpotable water, sanitary sewage, and industrial waste liquids are all included.
If the systems recommended are to be used as tank linings, it is important
that the application be performed by experienced workers. In addition, if the
coating to be applied will be in contact with potable water, it is important
that the material selected meets the necessary standards and is approved for
use by the health department. Two coats of epoxy (system D in Table 7.14) are
frequently used in this service.
Recommended systems are F in Table 7.13 and A, D, and E in Table 7.14.
7.9.7 area 7: Saltwater immersion
Areas that remain underwater in a coastal environment or industrial area or
that are constantly subjected to flowing salt or brine-laden water are included
in this category. Because of the increased rate of corrosion, a third coat may
be added to system F in Table 7.13 and systems A and E in Table 7.14 as additional protection against this more severe corrosion.
System D in Table 7.13 and systems A, E, and F in Table 7.14 are recommended for this service.
7.9.8 area 8: acidic Chemical Exposure (pH 2.0–5.0)
In the chemical process industries, this is one of the most severe environments encountered. When repainting, it is important that all surfaces are
clean of any chemical residue. Inorganic zinc and zinc-filled coatings are not
recommended for application in this area.
The system selected will be based on the quality of surface preparation,
length of chemical exposure, and housekeeping procedures. Decreased