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GB/T 13448-2006 English PDF (GBT13448-2006)

GB/T 13448-2006 English PDF (GBT13448-2006)

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GB/T 13448-2006: Test methods for prepainted steel sheet

This Standard is applicable to the determination and evaluation of coating performance of color-coated steel plates and strips.
GB/T 13448-2006
ICS 77.060
H 25
Replacing GB/T 13448-1992
Test Methods for Prepainted Steel Sheet
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Determination of Coating Thickness ... 6
5 Determination of Specular Gloss ... 10
6 Determination of Color Difference ... 12
7 Bending Test ... 14
8 Reverse Impact Test ... 16
9 Pencil Hardness Test ... 18
10 Organic Solvent Resistance Test ... 20
11 Abrasion Resistance Test ... 22
12 Scratch Resistance Test ... 24
13 Grid-Drawing Test ... 26
14 Cupping test ... 28
15 Boiling-Water Resistance Test ... 30
16 Acid-and-Alkali Resistance Test ... 31
17 Pollution Resistance Test ... 33
18 Neutral Salt Spray Resistance Test ... 36
19 Dry Heat Resistance Test ... 38
20 Damp Heat Resistance Test... 41
21 Sulfur Dioxide Damp Heat Resistance Test ... 43
22 Xenon Lamp Accelerated Aging Test ... 46
23 UV Lamp Accelerated Aging Test ... 49
24 Atmospheric Exposure Test ... 52
Appendix A (Informative) Corresponding Relationship between Knoop
Hardness Range of Specially-Used Pencil in Chinese Brand 505 Steel Coil Coating Hardness Test and Knoop Hardness of Chinese Brand 101 Painting
Pencil ... 56
This Standard replaced GB/T 13448-1992 Test Methods for Color-Coated Steel Plates and Strips.
Compared with GB/T 13448-1992, this Standard has the major changes as follows. --- Modify 8 test methods in GB/T 13448-1992, such as coating thickness determination, specular gloss determination, bending test, reverse impact test, pencil hardness test, grid-drawing test, neutral salt spray resistance test, damp heat resistance test, etc.;
--- Modify the accelerated weathering test in GB/T 13448-1992 into xenon lamp accelerated aging test;
--- Add terms and definitions, and 12 test methods like determination of color difference, organic solvent resistance test, abrasion resistance test, scratch resistance test, cupping test, boiling-water resistance test, acid-and-alkali resistance test, pollution resistance test, dry heat resistance test, sulfur dioxide damp heat resistance test, UV lamp accelerated aging test, atmospheric
exposure test, etc.
The Appendix A of this Standard is informative.
This Standard was proposed by China Iron and Steel Industry Association. This Standard shall be under the jurisdiction of National Technical Committee for Standardization of Steel.
Drafting organization of this Standard. Baoshan Iron and Steel Co., Ltd.
Chief drafting staffs of this Standard. Zhang Jiaqi, Li Lei, Yang Zhengye, Fang Chun, Shi Qiaoyun, Zhou Xing, and Li Heping.
This Standard was first-time published in April 1992.
Test Methods for Prepainted Steel Sheet
1 Scope
This Standard is applicable to the determination and evaluation of coating performance of color-coated steel plates and strips (hereinafter referred to as color-coated plate). 2 Normative References
The provisions in following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard, however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.
GB/T 1766-1995 Paints and Varnishes - Rating Schemes of Degradation of Coats GB/T 12754 Colored Painted Coat Steel Plates and Strips
3 Terms and Definitions
The following terms and definitions and those ones stipulated in GB/T 12754 are applicable to this document.
3.1 Relative luminous reflectance factor
Under the same geometric conditions, the ratio between the luminous flux value reflected by the specimen and the luminous flux value reflected by the standard surface. 3.2 Specular gloss
The relative luminous reflectance factor of the specimen in the specular reflection direction.
3.3 Tristimulus values
The amount of three primary stimuli required to the color match with the to-be- measured light in the three-color system.
3.4 Color space During the measuring period, the instrument shall be zeroed and calibrated constantly. Determination When the baseplate of color-coated plate is cold-rolled plate, select 3 different positions with the distance from the specimen edges greater than 25mm, use magnetic thickness tester to measure the coating thickness, and record the thickness value. When the baseplate of color-coated plate is galvanized plate, select 3 different positions with distance from the specimen edges greater than 25mm, use magnetic thickness tester to measure the total thickness of galvanized layer and coating. Remove the coating with paint remover that has no corrosion effect against the galvanized layer; measure the galvanized layer thickness at the same position (or use the known galvanized layer weight per unit to convert into the galvanized layer thickness), the difference between the total thickness and the galvanized layer thickness is the thickness of coating.
4.5.2 Micrometer method Mark the 3 different positions in the area about no less than 10mm away from the specimen edges, use micrometer to measure the thickness on the mark positions, and record them. When operating, pay attention that the coating shall not have the visible deformation, otherwise, it may influence the measurement results. Use appropriate solvent or paint remover to remove the coating on the marking positions, then use micrometer to measure the thickness of baseplates removing the coatings, and record the thickness values.
4.5.3 Metallographic microscope method Fix the specimen with appropriate materials, the specimen shall be perpendicular to the viewing surface during the specimen-preparing period. Grind and polish the prepared specimen, so that it is smooth enough to observe its coating section under the microscope. Pay attention to maintain the specimen perpendicular to the sandpaper during the operation process. Measure the coating thickness at 5 different positions in the specimen section by the scale on the microscope, and record the values.
4.5.4 Drilling damage microscope observation method Place the specimen on the drilling table and adjust the drilling depth control wheel of the automatic drilling device, so that the drill bit just penetrates the baseplate, drill a circular shallow angle shrinkage hole.
The arithmetic mean of coating specular gloss of the 3 different measurement positions is the gloss of such specimen.
5.7 Test report
The test report shall contain the following contents.
a) The adopted test standard and negotiated terms;
b) Instrument model, selected incident angle;
c) Specimen information;
d) Test results;
e) Test date and test personnel.
6 Determination of Color Difference
6.1 General
This Method is applicable to the quantitative determination of the color difference of color-coated plate.
6.2 Principle
Use colorimeter to measure the specular tristimulus values of reference sample and specimen, respectively; then the color difference between specimen and reference sample can be quantitatively measured.
6.3 Test device and materials
6.3.1 Colorimeter The colorimeter generally-adopted geometric structure can be divided into directional type and integrating sphere type. Thereof, the directional geometric structure can be divided into 45??/0?? and 0??/45??; while integrating sphere geometric structure can be divided into d/8?? and 8??/d...

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