AS 4750(INT)-2000

1 - AS 4750(Int)-2000 ELECTROGALVANIZED (ZINC) COATINGS ON FERROUS HOLLOW SECTIONS
4 - PREFACE
5 - CONTENTS
6 - 1 SCOPE
6 - 2 REFERENCED DOCUMENTS
7 - 3 DEFINITIONS
7 - 3.1 Coating mass
7 - 3.2 Coating mass, local
7 - 3.3 Coating thickness
7 - 3.4 Coating thickness, local
7 - 3.5 Electrogalvanizing
7 - 3.6 Electrogalvanized strip
7 - 3.7 Electrogalvanized coating
7 - 3.8 Electrogalvanizer
7 - 3.9 Hollow section
7 - 3.10 Reference area
7 - 3.11 Significant surface
7 - 3.12 Supplier
7 - 4 PROCESS
7 - 4.1 Pretreatment
8 - 4.2 Raw materials
8 - 4.3 Treatment after electrogalvanizing
8 - 4.4 Weld repair coating
8 - 4.5 Treatment after weld coating
8 - 5 APPEARANCE AND FREEDOM FROM DEFECTS
8 - 6 DESIGNATION
9 - 7 SELECTION OF TEST SPECIMENS
9 - 7.1 For coating mass or thickness determinations
9 - 7.2 For adherence of the coating (circular hollow sections only)
9 - 8 COATING MASS
9 - 8.1 General
9 - 8.2 Local coating mass determination
9 - 8.3 Average coating mass determination
9 - 9 ADHERENCE OF COATING
10 - 10 WELD COATING
11 - APPENDIX A - PURCHASING GUIDELINES
11 - A1 GENERAL
11 - A2 INFORMATION TO BE SUPPLIED BY THE PURCHASER
12 - APPENDIX B - MEANS FOR DEMONSTRATING COMPLIANCE WITH THIS STANDARD
12 - B1 SCOPE
12 - B2 STATISTICAL SAMPLING
12 - B3 PRODUCT CERTIFICATION
12 - B4 SUPPLIER’S QUALITY SYSTEM
13 - B5 OTHER MEANS OF ASSESSMENT
14 - APPENDIX C - GENERAL INFORMATION ON FACTORS THAT AFFECT THE CORROSION OF ZINC COATED STEEL
14 - C1 SCOPE
14 - C2 EXTERNAL ATMOSPHERIC CORROSIVITY FACTORS
14 - C3 LOCAL ENVIRONMENT EFFECTS
15 - C4 SEAWATER IMMERSION
16 - APPENDIX D - RENOVATION OF DAMAGED AREAS
16 - D1 EXTENT OF REPAIRABLE DAMAGED AREAS
16 - D2 REPAIR REQUIREMENTS
17 - APPENDIX E - TRANSPORT AND STORAGE OF ELECTROGALVANIZED HOLLOW SECTIONS
18 - APPENDIX F - DETERMINATION OF COATING MASS AND LOCAL THICKNESS
18 - F1 GENERAL
18 - F2 GRAVIMETRIC METHOD
18 - F2.1 Method
18 - F2.2 Calculation of coating mass
18 - F3 VOLUMETRIC METHOD
18 - F3.1 Method
18 - F3.2 Calculation of coating mass
19 - F4 MAGNETIC, MAGNETIC INDUCTION AND EDDY CURRENT METHODS FOR LOCAL THICKNESS
19 - F4.1 General
19 - F4.2 Calculation of coating mass
19 - F5 MICROGRAPHIC DETERMINATION FOR LOCAL THICKNESS
19 - F5.1 General
19 - F5.2 Calculation of coating mass
19 - F6 TEST REPORT

Specifies requirements for the classification, mass, quality and testing of zinc coatings on welded hollow sections produced from electrogalvanized steel strip. Also gives requirements for the repair of the coating damaged during the welding operation. Appendices give methods for the determination of coating mass and local thickness, and general advice on the corrosion protection, transport and storage and renovation of damage areas, of electrogalvanized coatings.

This Interim Standard specifies requirements for the classification, mass, quality and testing of zinc coatings on welded hollow sections produced from electrogalvanized strip.Matters relating to the quality, properties, or dimensional requirements of the steel hollow sections are outside the scope of this Interim Standard.NOTES:1 Advice and recommendations on information to be supplied by the purchaser 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 Interim Standard are given in Appendix B.3 For requirements for the steel base-metal of hollow sections see relevant product Standards, e.g. AS 1074 and AS 1163.4 General information on factors that affect the corrosion of zinc coated steel is given in Appendix C.

First published as AS 4750(Int)-2000.