《PROTECTIVE PAINTING OF STRUCTURAL STEEL》

1.GENERAL PRINCIPLES GOVERNING SUCCESSFUL PROTECTIVE PAINTING:1

1.1 Surface Preparation, Paints and Painting Procedure1

1.2 Importance of Good Design3

1.3 Influence of the Composition of the Basis Steel5

2.SURFACE PREPARATION:8

2.1 Millscale8

2.2 Types of Surface Preparation Available9

2.3 Effects of Different Methods of Surface Preparation on Paint Durability14

2.4 Comparison of Different Descaling Procedures18

2.5 Effect of Interval between Descaling and Painting21

2.6 Flame-Cleaning24

2.7 Phosphate Treatments27

2.8 Metal Coatings33

3.CHOICE OF PAINTING SCHEMES FOR NEW STEEL WORK:37

3.1 False Economy of Cheap Paints37

3.2 Priming Paints39

3.3 Finishing Paints45

3.4 Tar and Ditumen Paints48

4.PAINTING PROCEDURE:50

4.1 Importance of Good Painting Conditions50

4.2 Comparison of Different Methods of Paint Application55

4.3 Importance of Paint Film Thickness58

4.4 Measurement of Paint Film Thickness61

5.REPAINTING OF OLD STEELWORK:64

5.1 Standard of Deterioration at which Repainting should be undertaken64

5.2 Surface Preparation66

5.3 Choice of Painting Schemes for Maintenance67

6.PRACTICAL EXAMPLES:70

6.1 Waterless Gasholders, Middlesbrough70

6.2 Road Bridge,Hook72

6.3 Palm House, Kew72

6.4 Railway Footbridge74

7.SPECIAL CASES:76

7.1 Painting Schemes for Steel exposed to High Tempera-tures76

7.2 Painting Schemes for Metal Coatings79

APPENDIX A:Current and Projected Research Projects of the Pro-tective Coatings （Corrosion） Sub-Committee83

APPENDIX B:Formulations of Some Paints referred to in the Text85

APPENDIX C:Particulars of Test Sites and Some Other Places mentioned89

INDEX93