AS/NZS 2312:2002
Guide to the protection of structural steel against atmospheric corrosion by the use of protective coatings
Provides guidelines for the selection and specification of coating systems for the short, medium and long term protection of structural steel work against interior and exterior atmospheric, and non-atmospheric corrosive environments. The following aspects are covered in detail: Atmospheric environments, planning and design, surface preparation treatments, metallic and paint coatings, maintenance of coating systems, inspection and testing, and preparation of coating specifications. Contains comprehensive details of modern paint systems, including properties and typical applications.
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AS/NZS 2312:2002 Guide to the protection of structural steel against atmospheric corrosion by the use of protective coatings
AS/NZS 2312:2002 GUIDE TO THE PROTECTION OF STRUCTURAL STEEL AGAINST ATMOSPHERIC CORROSION BY THE USE OF PROTECTIVE COATINGS
PREFACE
CONTENTS
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE
1.2 NEED FOR CORROSION PROTECTION
1.3 USE OF THIS STANDARD
1.4 REFERENCED DOCUMENTS
1.5 DEFINITIONS
1.5.1 Corrosivity
1.5.2 Durability
1.5.3 Environment
1.5.4 Inspector
1.5.5 Nominal dry film thickness (NDFT)
1.6 DURABILITY CONSIDERATIONS
1.7 DESIGNATION OF PROTECTION SYSTEMS
1.7.1 General
1.7.2 Metallic coatings
1.7.3 Paint coatings
SECTION 2 CLASSIFICATION OF ENVIRONMENTS
2.1 GENERAL
2.2 MICRO-ENVIRONMENTS
2.3 ATMOSPHERIC CORROSIVITY CATEGORIES
2.4 OTHER ENVIRONMENTS
SECTION 3 PLANNING AND DESIGN FOR CORROSION PROTECTION
3.1 SCOPE AND GENERAL
3.2 PLANNING
3.3 DESIGN
3.3.1 General
3.3.2 Exposure environment
3.3.3 Materials of construction
3.3.4 Major design considerations
3.3.5 General design considerations
SECTION 4 SURFACE PREPARATION TREATMENTS
4.1 GENERAL
4.2 SURFACE PREPARATION TREATMENTS
4.2.1 Cleaning with solvents or alkaline solutions (See AS 1627.1)
4.2.2 Abrasive blast cleaning (See AS 1627.4)
4.2.3 Power tool cleaning (See AS 1627.2)
4.2.4 Hand tool cleaning (See AS 1627.2)
4.2.5 Pressure cleaning and jetting
4.2.6 The removal of soluble salts
4.3 THE PROTECTION OF STEEL DURING EXTENDED FABRICATION
4.4 RUST CONVERSION
SECTION 5 METALLIC COATINGS FOR CORROSION PROTECTION
5.1 GENERAL
5.2 METAL SPRAY COATINGS
5.2.1 General
5.2.2 Surface preparation and application
5.2.3 Selection of sprayed metal
5.2.4 Sealing
5.2.5 Metal spray sealer and paint finishes
5.2.6 Architectural finishes
5.2.7 Repair of metal sprayed coatings
5.2.8 Durability of metal sprayed coatings
5.3 HOT-DIP GALVANIZED COATINGS (BATCH PROCESS)
5.3.1 General
5.3.2 Bath sizes
5.3.3 Design for batch galvanizing
5.3.4 The batch hot-dip galvanizing process
5.3.5 Applications
5.3.6 Durability of batch hot-dip galvanized coatings and painted batch galvanized coatings
5.4 SECTIONS PRODUCED FROM PRE-GALVANIZED STRIP
5.5 SPECIALIZED HOT DIP GALVANIZED PRODUCTS
5.6 IN-LINE GALVANIZED PRODUCTS
5.7 STRUCTURE SECTIONS MANUFACTURED FROM ELECTROGALVANIZED STRIP
5.8 PAINT SYSTEMS FOR CONTINUOUSLY, SPECIALIZED AND ELECTROGALVANIZED PRODUCTS
5.9 THE USE OF ROOFING AND CLADDING MATERIALS
5.10 ELECTROPLATED COATINGS
SECTION 6 PAINT COATING SYSTEMS FOR CORROSION PROTECTION
6.1 GENERAL
6.2 DURABILITY OF PAINT COATINGS
6.3 COATING SYSTEMS FOR ATMOSPHERIC ENVIRONMENTS
SECTION 7 FACTORS INFLUENCING COATING SELECTION
7.1 GENERAL
7.2 SUBSTRATE AND SURFACE CONDITION
7.3 ENVIRONMENT
7.4 SYSTEM LIFE
7.5 DESIGN
7.6 SHOP OR SITE APPLICATION
7.7 COLOUR AND APPEARANCE
7.8 APPLICATION METHOD
7.9 CONDITIONS DURING APPLICATION
7.10 SURFACE PREPARATION
7.11 PREVIOUS EXPERIENCE
7.12 MAINTENANCE CONSIDERATIONS
7.13 INSPECTION
7.14 SAFETY AND ENVIRONMENTAL CONSTRAINTS
7.15 COST
SECTION 8 PAINTING AND PAINT APPLICATION METHODS
8.1 GENERAL
8.2 PAINT STORAGE
8.2.1 General
8.2.2 Shelf life
8.2.3 Pot life
8.2.4 Straining
8.3 MIXING AND THINNING OF PAINT
8.4 TYPE AND CONDITION OF THE SUBSTRATE
8.5 PAINTING CONDITIONS
8.6 SEQUENCE OF OPERATIONS
8.7 METHODS OF APPLICATION
8.7.1 Spray methods
8.7.2 Brush application
8.7.3 Roller application
8.8 STANDARD OF WORKMANSHIP
8.9 TIME REQUIREMENTS
8.9.1 Prepared surfaces
8.9.2 Period between coats
8.9.3 Effects of delays during painting
8.9.4 Drying time before handling
8.10 PAINT SPREADING RATE AND THICKNESS
SECTION 9 OTHER SYSTEMS FOR CORROSION PROTECTION
9.1 POWDER COATINGS
9.2 WRAPPING TAPES
SECTION 10 MAINTENANCE OF PROTECTIVE COATING SYSTEMS
10.1 GENERAL
10.2 CRITERIA FOR ASSESSING WHEN TO PAINT OR REPAIR
10.3 PRETREATMENT BEFORE REPAINTING
10.3.1 General
10.3.2 Condition of existing coating system
10.3.3 Surface contamination
10.3.4 Environmental protection
10.3.5 Methods
10.4 REPAINTING
10.4.1 General
10.4.2 Procedure
10.4.3 Records
10.5 REPAIRS AND REPAINTING OF WELDED STRUCTURES
SECTION 11 INSPECTION AND TESTING
11.1 GENERAL
11.2 REQUIREMENTS AND AUTHORITY OF INSPECTORS
11.3 PRELIMINARY DISCUSSIONS
11.4 DUTIES OF INSPECTORS
11.4.1 Inspection of paint coatings
11.4.2 Inspection of metallic coatings
11.5 FINAL INSPECTION
11.6 RECORDS AND INSPECTION REPORT
11.7 GUIDANCE ON THE USE OF TESTING EQUIPMENT
11.7.1 Dry film thickness
11.7.2 Wet film thickness
11.7.3 Film continuity
11.7.4 Surface profile
11.7.5 Degree of cure
SECTION 12 PREPARATION OF COATING SPECIFICATIONS
12.1 GENERAL
12.2 CONTENT OF A SPECIFICATION
12.2.1 Scope of work
12.2.2 Surface preparation
12.2.3 Coating system (see Section 6)
12.2.4 Coating materials-detailed stipulations
12.2.5 Application of coatings
12.2.6 Transport arrangements
12.2.7 Repair of welds and damaged areas
12.2.8 Inspection procedure requirements
12.2.9 Warranties
12.2.10 Maintenance painting specifications
SECTION 13 HEALTH AND SAFETY
13.1 GENERAL
13.2 THE PAINTED SURFACE
13.3 FLAMMABILITY
13.4 EYE PROTECTION
13.5 RESPIRATORS
13.6 NOISE
13.7 HANDLING
13.8 WORKING IN A CONFINED SPACE
13.9 SURFACE PREPARATION
13.10 APPLICATION OF PAINT
13.11 STORAGE OF PAINT
13.12 WELDING
13.13 BURNING OF PAINTED SURFACES
13.14 COATINGS NOT RECOMMENDED
13.14.1 Coal tars
13.14.2 Bitumen and asphalts
13.14.3 Zinc chromate
13.14.4 Lead
APPENDIX A - GUIDANCE ON THE USE OF THIS STANDARD
A1 GENERAL
A2 CHECK LIST FOR THE COATING OF NEW STRUCTURES
A3 CHECK LIST FOR THE MAINTENANCE PAINTING OF EXISTING STRUCTURES
A4 EXAMPLES OF THE USE OF THIS STANDARD
APPENDIX B - ADVICE ON ATMOSPHERIC CORROSION OF STEEL IN AUSTRALASIAN CLIMATES
APPENDIX C - NON-ATMOSPHERIC AND HOT ENVIRONMENTS
C1 GENERAL
C2 FRESH WATER
C3 SEAWATERS
C4 SOIL
C5 CHEMICAL AND OTHER SPECIALIZED ENVIRONMENTS
C6 COATING SYSTEMS FOR NON-ATMOSPHERIC ENVIRONMENTS
C7 HEAT RESISTING COATINGS
APPENDIX D - DESCRIPTION OF PAINT TYPES
D1 SCOPE
APPENDIX E - ECONOMICS OF CORROSION PROTECTION
E1 GENERAL
E2 INITIAL COSTS AND ECONOMICS OF PROTECTIVE TREATMENTS
E2.1 Surface preparation
E2.2 Paint application
E2.3 Galvanizing
E2.4 Inspection
E2.5 Paint coverage
E3 ECONOMIC EVALUATION OF PROTECTIVE TREATMENTS
E3.1 General
E3.2 A simple method of economic evaluation
E3.3 Present-value method
E3.4 Equivalent-annual-cost method
E3.5 Final evaluation
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AS/NZS 2312:2002 Guide to the protection of structural steel against atmospheric corrosion by the use of protective coatings
AS/NZS 2312:2002 GUIDE TO THE PROTECTION OF STRUCTURAL STEEL AGAINST ATMOSPHERIC CORROSION BY THE USE OF PROTECTIVE COATINGS
PREFACE
CONTENTS
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE
1.2 NEED FOR CORROSION PROTECTION
1.3 USE OF THIS STANDARD
1.4 REFERENCED DOCUMENTS
1.5 DEFINITIONS
1.5.1 Corrosivity
1.5.2 Durability
1.5.3 Environment
1.5.4 Inspector
1.5.5 Nominal dry film thickness (NDFT)
1.6 DURABILITY CONSIDERATIONS
1.7 DESIGNATION OF PROTECTION SYSTEMS
1.7.1 General
1.7.2 Metallic coatings
1.7.3 Paint coatings
SECTION 2 CLASSIFICATION OF ENVIRONMENTS
2.1 GENERAL
2.2 MICRO-ENVIRONMENTS
2.3 ATMOSPHERIC CORROSIVITY CATEGORIES
2.4 OTHER ENVIRONMENTS
SECTION 3 PLANNING AND DESIGN FOR CORROSION PROTECTION
3.1 SCOPE AND GENERAL
3.2 PLANNING
3.3 DESIGN
3.3.1 General
3.3.2 Exposure environment
3.3.3 Materials of construction
3.3.4 Major design considerations
3.3.5 General design considerations
SECTION 4 SURFACE PREPARATION TREATMENTS
4.1 GENERAL
4.2 SURFACE PREPARATION TREATMENTS
4.2.1 Cleaning with solvents or alkaline solutions (See AS 1627.1)
4.2.2 Abrasive blast cleaning (See AS 1627.4)
4.2.3 Power tool cleaning (See AS 1627.2)
4.2.4 Hand tool cleaning (See AS 1627.2)
4.2.5 Pressure cleaning and jetting
4.2.6 The removal of soluble salts
4.3 THE PROTECTION OF STEEL DURING EXTENDED FABRICATION
4.4 RUST CONVERSION
SECTION 5 METALLIC COATINGS FOR CORROSION PROTECTION
5.1 GENERAL
5.2 METAL SPRAY COATINGS
5.2.1 General
5.2.2 Surface preparation and application
5.2.3 Selection of sprayed metal
5.2.4 Sealing
5.2.5 Metal spray sealer and paint finishes
5.2.6 Architectural finishes
5.2.7 Repair of metal sprayed coatings
5.2.8 Durability of metal sprayed coatings
5.3 HOT-DIP GALVANIZED COATINGS (BATCH PROCESS)
5.3.1 General
5.3.2 Bath sizes
5.3.3 Design for batch galvanizing
5.3.4 The batch hot-dip galvanizing process
5.3.5 Applications
5.3.6 Durability of batch hot-dip galvanized coatings and painted batch galvanized coatings
5.4 SECTIONS PRODUCED FROM PRE-GALVANIZED STRIP
5.5 SPECIALIZED HOT DIP GALVANIZED PRODUCTS
5.6 IN-LINE GALVANIZED PRODUCTS
5.7 STRUCTURE SECTIONS MANUFACTURED FROM ELECTROGALVANIZED STRIP
5.8 PAINT SYSTEMS FOR CONTINUOUSLY, SPECIALIZED AND ELECTROGALVANIZED PRODUCTS
5.9 THE USE OF ROOFING AND CLADDING MATERIALS
5.10 ELECTROPLATED COATINGS
SECTION 6 PAINT COATING SYSTEMS FOR CORROSION PROTECTION
6.1 GENERAL
6.2 DURABILITY OF PAINT COATINGS
6.3 COATING SYSTEMS FOR ATMOSPHERIC ENVIRONMENTS
SECTION 7 FACTORS INFLUENCING COATING SELECTION
7.1 GENERAL
7.2 SUBSTRATE AND SURFACE CONDITION
7.3 ENVIRONMENT
7.4 SYSTEM LIFE
7.5 DESIGN
7.6 SHOP OR SITE APPLICATION
7.7 COLOUR AND APPEARANCE
7.8 APPLICATION METHOD
7.9 CONDITIONS DURING APPLICATION
7.10 SURFACE PREPARATION
7.11 PREVIOUS EXPERIENCE
7.12 MAINTENANCE CONSIDERATIONS
7.13 INSPECTION
7.14 SAFETY AND ENVIRONMENTAL CONSTRAINTS
7.15 COST
SECTION 8 PAINTING AND PAINT APPLICATION METHODS
8.1 GENERAL
8.2 PAINT STORAGE
8.2.1 General
8.2.2 Shelf life
8.2.3 Pot life
8.2.4 Straining
8.3 MIXING AND THINNING OF PAINT
8.4 TYPE AND CONDITION OF THE SUBSTRATE
8.5 PAINTING CONDITIONS
8.6 SEQUENCE OF OPERATIONS
8.7 METHODS OF APPLICATION
8.7.1 Spray methods
8.7.2 Brush application
8.7.3 Roller application
8.8 STANDARD OF WORKMANSHIP
8.9 TIME REQUIREMENTS
8.9.1 Prepared surfaces
8.9.2 Period between coats
8.9.3 Effects of delays during painting
8.9.4 Drying time before handling
8.10 PAINT SPREADING RATE AND THICKNESS
SECTION 9 OTHER SYSTEMS FOR CORROSION PROTECTION
9.1 POWDER COATINGS
9.2 WRAPPING TAPES
SECTION 10 MAINTENANCE OF PROTECTIVE COATING SYSTEMS
10.1 GENERAL
10.2 CRITERIA FOR ASSESSING WHEN TO PAINT OR REPAIR
10.3 PRETREATMENT BEFORE REPAINTING
10.3.1 General
10.3.2 Condition of existing coating system
10.3.3 Surface contamination
10.3.4 Environmental protection
10.3.5 Methods
10.4 REPAINTING
10.4.1 General
10.4.2 Procedure
10.4.3 Records
10.5 REPAIRS AND REPAINTING OF WELDED STRUCTURES
SECTION 11 INSPECTION AND TESTING
11.1 GENERAL
11.2 REQUIREMENTS AND AUTHORITY OF INSPECTORS
11.3 PRELIMINARY DISCUSSIONS
11.4 DUTIES OF INSPECTORS
11.4.1 Inspection of paint coatings
11.4.2 Inspection of metallic coatings
11.5 FINAL INSPECTION
11.6 RECORDS AND INSPECTION REPORT
11.7 GUIDANCE ON THE USE OF TESTING EQUIPMENT
11.7.1 Dry film thickness
11.7.2 Wet film thickness
11.7.3 Film continuity
11.7.4 Surface profile
11.7.5 Degree of cure
SECTION 12 PREPARATION OF COATING SPECIFICATIONS
12.1 GENERAL
12.2 CONTENT OF A SPECIFICATION
12.2.1 Scope of work
12.2.2 Surface preparation
12.2.3 Coating system (see Section 6)
12.2.4 Coating materials-detailed stipulations
12.2.5 Application of coatings
12.2.6 Transport arrangements
12.2.7 Repair of welds and damaged areas
12.2.8 Inspection procedure requirements
12.2.9 Warranties
12.2.10 Maintenance painting specifications
SECTION 13 HEALTH AND SAFETY
13.1 GENERAL
13.2 THE PAINTED SURFACE
13.3 FLAMMABILITY
13.4 EYE PROTECTION
13.5 RESPIRATORS
13.6 NOISE
13.7 HANDLING
13.8 WORKING IN A CONFINED SPACE
13.9 SURFACE PREPARATION
13.10 APPLICATION OF PAINT
13.11 STORAGE OF PAINT
13.12 WELDING
13.13 BURNING OF PAINTED SURFACES
13.14 COATINGS NOT RECOMMENDED
13.14.1 Coal tars
13.14.2 Bitumen and asphalts
13.14.3 Zinc chromate
13.14.4 Lead
APPENDIX A - GUIDANCE ON THE USE OF THIS STANDARD
A1 GENERAL
A2 CHECK LIST FOR THE COATING OF NEW STRUCTURES
A3 CHECK LIST FOR THE MAINTENANCE PAINTING OF EXISTING STRUCTURES
A4 EXAMPLES OF THE USE OF THIS STANDARD
APPENDIX B - ADVICE ON ATMOSPHERIC CORROSION OF STEEL IN AUSTRALASIAN CLIMATES
APPENDIX C - NON-ATMOSPHERIC AND HOT ENVIRONMENTS
C1 GENERAL
C2 FRESH WATER
C3 SEAWATERS
C4 SOIL
C5 CHEMICAL AND OTHER SPECIALIZED ENVIRONMENTS
C6 COATING SYSTEMS FOR NON-ATMOSPHERIC ENVIRONMENTS
C7 HEAT RESISTING COATINGS
APPENDIX D - DESCRIPTION OF PAINT TYPES
D1 SCOPE
APPENDIX E - ECONOMICS OF CORROSION PROTECTION
E1 GENERAL
E2 INITIAL COSTS AND ECONOMICS OF PROTECTIVE TREATMENTS
E2.1 Surface preparation
E2.2 Paint application
E2.3 Galvanizing
E2.4 Inspection
E2.5 Paint coverage
E3 ECONOMIC EVALUATION OF PROTECTIVE TREATMENTS
E3.1 General
E3.2 A simple method of economic evaluation
E3.3 Present-value method
E3.4 Equivalent-annual-cost method
E3.5 Final evaluation
AS/NZS 2312:2002
Online Library subscription pricing
The cost of your subscription will depend on which standards you want to access, and how many people in your organisation need to be able to access the Online Library subscription at the same time (concurrent users). During your subscription period, we are also able to make any necessary changes and ensure you are aware of any pricing changes that result. For a quote, contact our Online Library team by emailing onlinelibrary@standards.govt.nz.