AS/NZS 2312.2:2014
Guide to the protection of structural steel against atmospheric corrosion by the use of protective coatings - Part 2: Hot dip galvanizing
Clarifies the requirements for proper specification and design of hot dip galvanized articles in the atmosphere. This Standard is based on the ISO 14713 series, Zinc coatings — Guidelines and recommendations for the protection of iron and steel in structures. It completely replaces previous references in AS/NZS 2312:2002 Chapter 5 and elsewhere in that document.
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AS/NZS 2312.2:2014 GUIDE TO THE PROTECTION OF STRUCTURAL STEEL AGAINST ATMOSPHERIC CORROSION BY THE USE OF PROTECTIVE...
PREFACE
CONTENTS
1 SCOPE
2 REFERENCED DOCUMENTS
3 DEFINITIONS
3.1 Atmospheric corrosion
3.2 Elevated temperatures
3.3 Exceptional exposure
3.4 Hot dip galvanized coating
3.5 Hot dip galvanizing
3.6 Life to first maintenance
4 MATERIALS-IRON AND STEEL SUBTRATES
5 ZINC COATINGS
5.1 Types of coating
5.1.1 General
5.1.2 Hot dip galvanized coatings (applied after fabrication to AS/NZS 4680 and AS 1214)
5.1.3 Hot dip galvanized coatings (applied onto continuous sheet to AS 1397)
5.1.4 Hot dip galvanized coatings (applied onto continuously cold-formed shapes to AS/NZS 4791 and AS/NZS 4792)
5.1.5 Mechanically plated coatings (to AS 5056)
5.1.6 Electrodeposited coatings (to AS 1789, AS 1897 or AS 4750)
5.2 Selection of hot dip galvanized coating
6 CORROSION IN THE ATMOSPHERE
6.1 General
6.2 Atmospheric corrosivity in Australia and New Zealand
6.3 Life to first maintenance of coatings
6.3.1 General
6.3.2 Criteria for assessing when to repair or regalvanize
6.4 Accelerated test methods applied to zinc coatings
7 GENERAL DESIGN REQUIREMENTS
7.1 General principles of design to avoid corrosion
7.2 Tubes and hollow sections
7.2.1 General
7.2.2 Corrosion protection of internal and external surfaces
7.3 Connections
7.3.1 Fastenings to be used with coatings
7.3.2 Welding considerations related to coatings
7.3.3 Brazing or soldering
7.4 Maintenance of coatings
7.5 Duplex systems
7.5.1 General
7.5.2 Painting for decorative, identifying colour or enhanced service life
7.5.3 Preparation for painting
7.5.4 Painting for unwashed surfaces
7.5.5 Painting for exposure to soil and/or prolonged dampness
7.5.6 Painting for specific industrial chemical or solvent exposure
7.5.7 Painting for lintels and shelf angles in masonry construction
7.5.8 Maintenance of duplex coatings
7.6 Design for storage and transport
8 DESIGN FOR HOT DIP GALVANIZING TO AS/NZS 4680
8.1 General
8.2 Surface preparation
8.3 Procedures related to design considerations
8.4 Design features
8.5 Tolerances
8.5.1 General
8.5.2 Dimensional tolerances on mating threads
9 EFFECT OF ARTICLE CONDITION ON QUALITY OF HOT DIP GALVANIZING TO AS/NZS 4680
9.1 Material composition
9.2 Mechanical properties of processed steel
9.3 Castings
9.4 Surface condition
9.5 Influence of steel surface roughness on the coating thickness
9.6 Influence of thermal cutting processes
9.7 Effect of internal stresses in the base steel
9.7.1 General
9.7.2 Distortion cracking
9.7.3 Hydrogen embrittlement
9.7.4 Cold-work (strain-age) embrittlement
9.7.5 Liquid metal assisted cracking (LMAC) or liquid metal embrittlement (LME)
9.8 Large objects or thick steels
9.9 Hot dip galvanizing practice
APPENDIX A - PREFERRED DESIGNS OF ARTICLES FOR HOT DIP GALVANIZING TO AS/NZS 4680
APPENDIX B - CORROSION IN DIFFERENT ENVIRONMENTS
B1 EXPOSURE TO SOILS
B2 EXPOSURE TO WATER
B3 ABRASION
B4 EXPOSURE TO CHEMICALS
B5 ELEVATED TEMPERATURES
B6 EMBEDDED IN CONCRETE
B7 CONTACT WITH WOOD
B8 BIMETALLIC CONTACT
APPENDIX C - INSPECTION OF HOT DIP GALVANIZED COATINGS
BIBLIOGRAPHY
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References
Structural steel - Welded I sections
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AS/NZS 2312.2:2014 GUIDE TO THE PROTECTION OF STRUCTURAL STEEL AGAINST ATMOSPHERIC CORROSION BY THE USE OF PROTECTIVE...
PREFACE
CONTENTS
1 SCOPE
2 REFERENCED DOCUMENTS
3 DEFINITIONS
3.1 Atmospheric corrosion
3.2 Elevated temperatures
3.3 Exceptional exposure
3.4 Hot dip galvanized coating
3.5 Hot dip galvanizing
3.6 Life to first maintenance
4 MATERIALS-IRON AND STEEL SUBTRATES
5 ZINC COATINGS
5.1 Types of coating
5.1.1 General
5.1.2 Hot dip galvanized coatings (applied after fabrication to AS/NZS 4680 and AS 1214)
5.1.3 Hot dip galvanized coatings (applied onto continuous sheet to AS 1397)
5.1.4 Hot dip galvanized coatings (applied onto continuously cold-formed shapes to AS/NZS 4791 and AS/NZS 4792)
5.1.5 Mechanically plated coatings (to AS 5056)
5.1.6 Electrodeposited coatings (to AS 1789, AS 1897 or AS 4750)
5.2 Selection of hot dip galvanized coating
6 CORROSION IN THE ATMOSPHERE
6.1 General
6.2 Atmospheric corrosivity in Australia and New Zealand
6.3 Life to first maintenance of coatings
6.3.1 General
6.3.2 Criteria for assessing when to repair or regalvanize
6.4 Accelerated test methods applied to zinc coatings
7 GENERAL DESIGN REQUIREMENTS
7.1 General principles of design to avoid corrosion
7.2 Tubes and hollow sections
7.2.1 General
7.2.2 Corrosion protection of internal and external surfaces
7.3 Connections
7.3.1 Fastenings to be used with coatings
7.3.2 Welding considerations related to coatings
7.3.3 Brazing or soldering
7.4 Maintenance of coatings
7.5 Duplex systems
7.5.1 General
7.5.2 Painting for decorative, identifying colour or enhanced service life
7.5.3 Preparation for painting
7.5.4 Painting for unwashed surfaces
7.5.5 Painting for exposure to soil and/or prolonged dampness
7.5.6 Painting for specific industrial chemical or solvent exposure
7.5.7 Painting for lintels and shelf angles in masonry construction
7.5.8 Maintenance of duplex coatings
7.6 Design for storage and transport
8 DESIGN FOR HOT DIP GALVANIZING TO AS/NZS 4680
8.1 General
8.2 Surface preparation
8.3 Procedures related to design considerations
8.4 Design features
8.5 Tolerances
8.5.1 General
8.5.2 Dimensional tolerances on mating threads
9 EFFECT OF ARTICLE CONDITION ON QUALITY OF HOT DIP GALVANIZING TO AS/NZS 4680
9.1 Material composition
9.2 Mechanical properties of processed steel
9.3 Castings
9.4 Surface condition
9.5 Influence of steel surface roughness on the coating thickness
9.6 Influence of thermal cutting processes
9.7 Effect of internal stresses in the base steel
9.7.1 General
9.7.2 Distortion cracking
9.7.3 Hydrogen embrittlement
9.7.4 Cold-work (strain-age) embrittlement
9.7.5 Liquid metal assisted cracking (LMAC) or liquid metal embrittlement (LME)
9.8 Large objects or thick steels
9.9 Hot dip galvanizing practice
APPENDIX A - PREFERRED DESIGNS OF ARTICLES FOR HOT DIP GALVANIZING TO AS/NZS 4680
APPENDIX B - CORROSION IN DIFFERENT ENVIRONMENTS
B1 EXPOSURE TO SOILS
B2 EXPOSURE TO WATER
B3 ABRASION
B4 EXPOSURE TO CHEMICALS
B5 ELEVATED TEMPERATURES
B6 EMBEDDED IN CONCRETE
B7 CONTACT WITH WOOD
B8 BIMETALLIC CONTACT
APPENDIX C - INSPECTION OF HOT DIP GALVANIZED COATINGS
BIBLIOGRAPHY
Previous versions
AS/NZS 2312.2:2014
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.