Paint and Conversion Coatings

1. 1
In the name of
GOD
Paint and
Conversion
Coatings
2
ADELK

3. Surface preparation forcoating
Cleaning and Degreasing
Mechanical
Chemical
Solvent
….
Polishing
Mechanical
Chemical
Electrochemical
Water rinsing
&
Neutralization

4. 1- Cleaning

5. 1- Cleaning
Stages
1. Surface ConditionAssessment
2. Remove Old Coatings
3. Remove Oils, Chlorides, Acids and Other Surface Contaminants
4. Remove Loose Parts of the Surface
5. Profile the Surface
6. Dry the Surfaces

7. 1- Cleaning
The removal of rust and scale is the problem one often encounters
for removal from mill products, forgings, castings and fabricated
metal parts.
Mechanical cleaning
Flame cleaning
Chemical cleaning
Solvent cleaning

8. 1- Cleaning
1-1-Mechanical Cleaning
Abrasive Blast Cleaning (dry or Wet)

9. 1- Cleaning
1-1-Mechanical Cleaning
Levels of abrasive blast cleaning
1. Light Blast Cleaning / Sweep Blast Cleaning / Brush Off
2. Industrial Blast Cleaning
3. Commercial Blast Cleaning
4. Near White Blast Cleaning)
5. White Metal Blast Cleaning

10. 1- Cleaning
1-1-Mechanical Cleaning
Classification of abrasive blasting methods

12. SOLVENT CLEANING
SP 1 / ISO 8504
Loosely-adhering material: 100%
Tightly-adhering material: 100%
Stains, streaks, shadows: 100%
adhesion and should be rinsed off.
BRUSH OFF
SP 7 / NACE #4 / SA1
Light Blast Cleaning, sweep blast
Loosely-adhering material: 0%
Tightly-adhering material: 100%
Stains, streaks, shadows: 100%

13. INDUSTRIAL BLAST
CLEANING
SP 14 / NACE #8
Loosely-adhering material: 0%
Tightly-adhering material: 10%
Stains, streaks, shadows: 100%
COMMERCIAL BLAST
CLEANING
SP 6 / NACE #3 / SA 2
aka Thorough Blast Cleaning
Loosely-adhering material: 0%
Tightly-adhering material: 0%
Stains, streaks, shadows: 33%

14. NEAR WHITE BLAST CLEANING
SP 10 / NACE #2 / SA 2.5
aka Very Thorough Blast Cleaning
Loosely-adhering material: 0%
Tightly-adhering material: 0%
Stains, streaks, shadows: SP 10
5%, Sa 2 ½ 15%
WHITE METAL BLAST CLEANING
SP 5 / NACE #1 / SA 3
aka Blast Clean to Visibly Clean
Steel
Loosely-adhering material: 0%
Tightly-adhering material: 0%
Stains, streaks, shadows: 0%

16. 1- Cleaning
1-2-Flame Cleaning
Flame cleaning is the process
of cleaning a structural steel
surface by passing an
intensely hot oxyacetylene
flame over it.

17. 1- Cleaning
1-3-Solvent Cleaning
Aliphatic hydrocarbon Petroleum solvent
Aromatichydrocarbon Coal tar solvent
Non-combustible solvent Chlorinated hydrocarbon
Polar solvent Ketone, Alcohol, and Phenol

18. 1- Cleaning
1-3-Solvent Cleaning
(a) Vapour,
(b) Vapour-Spray-Vapour system,
(c) Warm liquid-vapour system,
(d) Boiling liquid-warm liquid-vapour
system.
(e) Solvent wiping
(f) Ultrasonic immersion