Trouble Shooting Guide
Problem:
Coating weight too low
Cause(s):
• Phosphate or Accelerator concetration too low
• Phosphate bath temperature too low
• Process time too slow
Remedy:
• Increase concentration
• Increase phosphate bath temeperature
• Lengthen time phosphating stage
Problem:
Coating weight too high
Cause(s):
• Phosphate or Accelerator concentration too high
• Process time too long
Remedy:
• Decrease concentration
• Shorten time
Problem:
Powder on Coating
Cause(s):
• Poor rinses
• Excessive sludge
• Accelerator concentration too high
• Higher bath temperature
Remedy:
• Keep rinse overflowing
• De-sludge tank
• Allow concentration to drop
• Lower the temperature of the bath
Problem:
Spotty Coating
Cause(s):
• Poor cleaning
• Low concentration of Phosphatizer or Accelerator
• Poor solution coverage
• Resistant to Metal
Remedy:
• Check cleaning tank
• Increase concentration
• Check racking and nozzles
• Add Jernstedt salts to rinse or lean tank
Problem:
Rusting
Cause(s):
• Coating weight too low
• Final dry-off too slow
• Dry-off between stages
• Higher free acid pointage in phosphating bath
Remedy:
• See "Trouble Coating Weight too Low"
• Increase temperature in the final rinse using air blow off
• Better placement of nozzles
• Use fog nozzles
• Run at lower temperatures
• Reduce the free acid pointage
Problem:
Streaking
Cause(s):
• Poor cleaning
• Poor rising
• Dry-off between stages
Remedy:
• Check cleaning stage
• Keep over-flowing
• Better arrangement of nozzles
• Use fog nozzle
• Use fog nozzle
• Run at lower temperatures
Links in this section:
• epoxy polyester powder • epoxy powder • polyester powder
• speciality powder • why powder coatings? • household appliances
• automotive components • furniture • architectural • electrical
• metal pre-treatment • chromatising • iron phosphating • zinc phosphating
• chromate process • troubleshooting tips • material safety sheets
Problem:
Coating weight too low
Cause(s):
• Phosphate or Accelerator concetration too low
• Phosphate bath temperature too low
• Process time too slow
Remedy:
• Increase concentration
• Increase phosphate bath temeperature
• Lengthen time phosphating stage
Problem:
Coating weight too high
Cause(s):
• Phosphate or Accelerator concentration too high
• Process time too long
Remedy:
• Decrease concentration
• Shorten time
Problem:
Powder on Coating
Cause(s):
• Poor rinses
• Excessive sludge
• Accelerator concentration too high
• Higher bath temperature
Remedy:
• Keep rinse overflowing
• De-sludge tank
• Allow concentration to drop
• Lower the temperature of the bath
Problem:
Spotty Coating
Cause(s):
• Poor cleaning
• Low concentration of Phosphatizer or Accelerator
• Poor solution coverage
• Resistant to Metal
Remedy:
• Check cleaning tank
• Increase concentration
• Check racking and nozzles
• Add Jernstedt salts to rinse or lean tank
Problem:
Rusting
Cause(s):
• Coating weight too low
• Final dry-off too slow
• Dry-off between stages
• Higher free acid pointage in phosphating bath
Remedy:
• See "Trouble Coating Weight too Low"
• Increase temperature in the final rinse using air blow off
• Better placement of nozzles
• Use fog nozzles
• Run at lower temperatures
• Reduce the free acid pointage
Problem:
Streaking
Cause(s):
• Poor cleaning
• Poor rising
• Dry-off between stages
Remedy:
• Check cleaning stage
• Keep over-flowing
• Better arrangement of nozzles
• Use fog nozzle
• Use fog nozzle
• Run at lower temperatures
Links in this section:
• epoxy polyester powder • epoxy powder • polyester powder
• speciality powder • why powder coatings? • household appliances
• automotive components • furniture • architectural • electrical
• metal pre-treatment • chromatising • iron phosphating • zinc phosphating
• chromate process • troubleshooting tips • material safety sheets
Coating Types:
• Epoxy Polyester Powder
• Epoxy Powder
• Polyester Powder
• Speciality Powder
Technical Sheets• Click here to download
