AS/NZS 4791:1999

1 - AS/NZS 4791:1999 HOT-DIP GALVANIZED (ZINC) COATINGS ON FERROUS OPEN SECTIONS, APPLIED BY AN IN-LINE PROCESS
4 - PREFACE
5 - CONTENTS
6 - 1 SCOPE
6 - 2 REFERENCED DOCUMENTS
7 - 3 DEFINITIONS
7 - 3.1 Coating mass
7 - 3.2 Coating thickness
7 - 3.3 Coating thickness, local
7 - 3.4 Galvanizer
7 - 3.5 Hot-dip galvanized coating
7 - 3.6 Hot-dip galvanizing
7 - 3.7 In-line hot-dip galvanizing
7 - 3.8 Open section
7 - 3.9 Reference area
7 - 3.10 Significant surface
7 - 3.11 Supplier
7 - 4 GALVANIZING PROCESS
7 - 4.1 Pretreatment
7 - 4.2 Bath composition
8 - 4.3 Galvanizing
8 - 4.4 Treatment after galvanizing
8 - 5 APPEARANCE AND FREEDOM FROM DEFECTS
8 - 6 DESIGNATION
8 - 7 SELECTION OF TEST SPECIMENS
8 - 7.1 For coating mass or thickness determinations
8 - 7.2 For adherence of the coating
8 - 8 COATING MASS AND THICKNESS
8 - 8.1 Coating mass
8 - 8.2 Coating thickness
9 - 9 ADHERENCE OF COATING
10 - APPENDIX A - PURCHASING GUIDELINES
10 - A1 GENERAL
10 - A2 INFORMATION TO BE SUPPLIED BY THE PURCHASER
11 - APPENDIX B - MEANS FOR DEMONSTRATING COMPLIANCE WITH THIS STANDARD
11 - B1 SCOPE
11 - B2 STATISTICAL SAMPLING
11 - B3 PRODUCT CERTIFICATION
11 - B4 SUPPLIER'S QUALITY SYSTEM
12 - B5 OTHER MEANS OF ASSESSMENT
13 - APPENDIX C - GENERAL INFORMATION ON FACTORS THAT AFFECT THE CORROSION OF GALVANIZED STEEL
13 - C1 SCOPE
13 - C2 EXTERNAL ATMOSPHERIC CORROSIVITY FACTORS
13 - C3 LOCAL ENVIRONMENT EFFECTS
14 - C4 SEAWATER IMMERSION
15 - APPENDIX D - RENOVATION OF DAMAGED AREAS
15 - D1 EXTENT OF REPAIRABLE DAMAGED AREAS
15 - D2 REPAIR REQUIREMENTS
16 - APPENDIX E - TRANSPORT AND STORAGE OF GALVANIZED OPEN SECTIONS
17 - APPENDIX F - DETERMINATION OF COATING MASS AND LOCAL THICKNESS
17 - F1 GENERAL
17 - F2 GRAVIMETRIC METHOD
17 - F2.1 Method
17 - F2.2 Calculation of coating mass
17 - F3 VOLUMETRIC METHOD
17 - F3.1 Method
17 - F3.2 Calculation of coating mass
18 - F4 MAGNETIC, MAGNETIC INDUCTION AND EDDY CURRENT METHODS FOR LOCAL THICKNESS
18 - F4.1 General
18 - F4.2 Calculation of coating mass
18 - F5 TEST REPORT

Specifies requirements for the mass, quality and testing of galvanized coatings applied to ferrous open sections on all surfaces, except cut ends, using an in-line process that utilizes specialized equipment. Appendices give corrosion information, advice on transport and storage of galvanized products, requirements for the renovation of uncoated areas and methods for the determination of coating mass and local thickness.

This Standard specifies requirements for the mass, quality and testing of galvanized coatings applied to ferrous open sections on all surfaces except cut ends, using an in-line process that utilizes specialized equipment.Matters relating to the quality, properties, or dimensional requirements of the open sections are outside the scope of this Standard.NOTES:1 Advice and recommendations on information to be supplied by the purchaser to the hot-dip galvanizer at the time of enquiry or order are contained in the purchasing guidelines set out in Appendix A.2 Alternative means for determining compliance with this Standard are given in Appendix B.3 General information on factors that affect the corrosion of galvanized steel is given in Appendix C.4 Electroplated zinc coatings applied to steel strip for manufacture into open sections are not covered by this Standard. The application of this Standard to these coatings is subject to agreement between the purchaser and the supplier.

First published as AS/NZS 4791:1999.