GB/T 1839-2008 www.ChineseStandard.net Page 1 of 15 Translated English of Chinese Standard: GB/T1839-2008 www.ChineseStandard.net
[email protected] GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.01 H 25 GB/T 1839-2008 Replacing GB/T 1839-2003 and GB/T 2973-2004 Test Method for Gravimetric Determination of the Mass per Unit Area of Galvanized Coatings on Steel Products (ISO 1460:1992, Metallic Coatings - Hot Dip Galvanized Coatings on Ferrous Materials - Gravimetric Determination of the Mass per Unit Area, MOD) Issued on: March 30, 2008 Implemented on: December 01, 2008 Jointly issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. www.ChineseStandard.net --> Buy True-PDF --> Auto-delivered in 0~10 minutes.
GB/T 1839-2008 www.ChineseStandard.net Page 2 of 15 Table of Contents Forward ............................................................................................................ 3 1 Scope ......................................................................................................... 5 2 Normative References ................................................................................ 5 3 Principle ..................................................................................................... 5 4 Test Solution ............................................................................................... 6 5 Samples ..................................................................................................... 6 6 Test Procedure ........................................................................................... 7 7 Result Calculation ...................................................................................... 7 8 Reproducibility ............................................................................................ 8 9 Test Report ................................................................................................. 8 Appendix A (Informative) Fluorescence X Ray Measurement Method for the Mass of Zinc Coating of Galvanized Steel Sheets ......................................... 10 Appendix B (Informative) Comparison between Number of Chapters and Articles of This Standard and those of ISO 1460:1992 .................................. 14 Appendix C (Informative) Technical Differences and the Reasons between This Standard and ISO 1460:1992 ................................................................. 15 www.ChineseStandard.net --> Buy True-PDF --> Auto-delivered in 0~10 minutes.
GB/T 1839-2008 www.ChineseStandard.net Page 3 of 15 Forward This Standard modifies and adopts the international standard ISO 1460:1992 "Metallic Coatings - Hot Dip Galvanized Coatings on Ferrous Materials - Gravimetric Determination of the Mass per Unit Area". For the convenience of comparison, the serial number of the chapters and articles of this Standard and the serial number of chapters and articles of ISO 1460:1992 are listed in Appendix 8. Modification was made when this Standard adopts ISO 1460:1992. These technical differences are marked with vertical single-line at the margin of the involved articles. Technical differences and their reasons are provided in Appendix C for reference. Compared with ISO 1460:1992, the main differences in this Standard are as follows: - Applicable categories of galvanized coatings were added; they are respectively pure galvanizing coating, zinc-iron alloy coating, zinc-iron alloy and albumen coating (such as zinc -5% aluminum alloy coating and 55% aluminum -zinc alloy coating); - Deionizer water was added as diluent; - Requirements on sample areas were added; - Accuracy of sample weighting by balance was specified; if the coating mass of samples is not less than 0.1g, the weighing shall be accurate to 0.001g; - Appendix A "Fluorescence X Ray Measurement Methods for the Mass of Zinc Coating of Galvanized Steel Sheets" was added. This Standard replaces GB/T 1839-2003 "Test Method for Gravimetric Determination of Mass per Unit Area of Galvanized Coatings Steel Products" and GB/T 2973-2004 "Zinc Coated Steel Wire Test Method for Gravimetric Determination of Zinc Coating". Compared with GB/T 1839-2003 and GB/T 2973-2004, the main changes in this Standard are as follows: - Applicable categories of galvanized coatings were added; they are respectively pure galvanizing coating, zinc-iron alloy coating, zinc-iron alloy and aluminum-zinc coating (such as zinc-5% aluminum alloy coating and 55% aluminum-zinc alloy coating); - Accuracy of sample weighting by balance was specified; if the coating mass of samples is not less than 0.1g, the weighing shall be accurate to 0.001g; www.ChineseStandard.net --> Buy True-PDF --> Auto-delivered in 0~10 minutes.
GB/T 1839-2008 www.ChineseStandard.net Page 5 of 15 Test Method for Gravimetric Determination of the Mass per Unit Area of Galvanized Coatings on Steel Products 1 Scope This Standard specifies principle, test solution, samples, test procedure, result calculation, reproducibility and test methods for gravimetric determination of the mass per unit area of galvanized coatings on steel products. The galvanized coatings stated in this Standard include pure galvanizing coating, zinc-iron alloy and aluminum-zinc coating (such as zinc -5% aluminum alloy coating and 55% aluminum-zinc alloy coating). This Standard is applicable to steel products such as hot dip galvanizing and electro-galvanizing which are easy for the determination. Methods in Appendix A also may be adopted for the mass test for the zinc coating of galvanized steel sheets. 2 Normative References The following standards contain provisions which, through reference in this Standard, constitute the provisions of this Standard. For dated reference, the subsequent amendments (excluding correction) or revisions of these publications do not apply. However, the parties who enter into agreement based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document applies. GB/T 8170 Rules for Rounding off of Numerical Values 3 Principle Galvanized coatings on already-known surface area are dissolved in the test solution with inhibition of corrosion; then the sample mass before-and-after the coatings are dissolved is weighed; finally mass of galvanized coatings per unit area is calculated according to the weighing difference and sample area. www.ChineseStandard.net --> Buy True-PDF --> Auto-delivered in 0~10 minutes.
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