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GB/T 5237 consists of the following six parts under the general title Wrought aluminium alloy extruded profiles for architecture:
——Part 1: Mill finish profiles;
——Part 2: Anodized profiles;
——Part 3: Electrodeposition coating profiles
——Part 4: Powder coating profiles;
——Part 5: Paint coating profiles;
——Part 6: Thermal barrier profiles.
Thisis Part 2 of GB/T 5237.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB 5237.2-2008 Wrought aluminium alloy extruded profiles for architecture - Part 2: Anodized profiles. In addition to a number of editorial changes, the following technical changes have been made with respect to GB/T 5237.2-2008:
——statement of “4.4.1 and 4.4.2 of this part are compulsory while the others are voluntary” in the Foreword are deleted (see the Foreword in Edition 2008);
——statement of “this part is revised by reference to JIS H 8601-1999 Anodic oxide coatings on aluminium and aluminium alloys” in the Foreword are deleted (see the Foreword in Edition 2008);
——the applicable “scope” of the part is modified (see Clause 1; Clause 1 in Edition 2008);
——normative reference GB/T 228-2002 is deleted (see Clause 2 and 5.2 in Edition 2008);
——normative reference GB/T 1766 is deleted (see Clause 2 and 5.4.6.1 in Edition 2008);
——normative reference GB/T 8753.2 is deleted (see Clause 2 and 5.4.2 in Edition 2008);
——normative reference GB/T 14952.3 is deleted (see Clause 2, 5.4.3.3, 5.5 and 6.4 in Edition 2008);
——normative reference GB/T 20975 (all parts) is deleted (see Clause 2 and 5.1 in Edition 2008);
——normative reference GB/T 3199 is added (see Clause 2, 7.1.2, 7.2 and 7.3);
——normative reference GB/T 8005.3 is added (see Clauses 2 and 3);
——normative reference GB/T 8753.1 is added (see Clause 2 and 5.4.3);
——normative reference GB/T 12967.6 is added (see Clause 2, 5.4.2 and 5.5);
——normative reference GB/T 8013.1-2007 is modified as that without year number (see Clause 2, 4.6.7, 5.4.7 and 6.5; Clause 2, 4.4.7, 5.4.7 and 6.4 in Edition 2008);
——introduction of "Terms and Definitions" is modified (see Clause 3; Clause 3 in Edition 2008);
——the definition of “exposed surfaces” is modified (see 3.1; 3.1 in Edition 2008);
——the definitions of “local thickness” and “average thickness” are deleted (see 3.2 and 3.3 in Edition 2008);
——“types and characteristics of surface texture of profiles” is added in the product classification (see 4.1.2);
——”typical purpose” in the product classification is deleted (see 4.1.2 in Edition 2008);
——"coating color” in the product classification is added (see 4.1.3);
——contents of “surface treatment method” in the product classification are modified (see 4.1.3; 4.1.2 in Edition 2008);
——requirements for labels and examples in the product classification are modified (see 4.1.4; 4.1.3 in Edition 2008);
——contents of "quality guarantee" are added (see 4.2);
——coating property item “color and color difference” is modified as “color difference” (see 4.6.2, 5.4.2 and Clause 6; 4.4.3, 5.4.3 and Clause 6 in Edition 2008);
——shakeout test requirements for abrasive resistance are modified (see 4.6.4; 4.4.5 in Edition 2008);
——abrasive blasting test requirements for abrasive resistance are added (see 4.6.4);
——requirements and test method for “accelerated weather resistance” in weather resistance are deleted (see 4.4.6.1 and 5.4.6.1 in Edition 2008);
——requirements and test method for “ultraviolet resistance” in weather resistance are added (see 4.6.6.1 and 5.4.6.1);
——test method for chemical composition and mechanical property is modified (see 5.1 and 5.2; 5.1 and 5.2 in Edition 2008);
——inspection method for color difference is modified (see 5.4.2; 5.4.3 in Edition 2008);
——test method for hole sealing quality is modified (see 5.4.3; 5.4.2 in Edition 2008);
——test method for abrasive resistance is modified (see 5.4.4; 5.4.5 in Edition 2008);
——note in test method for natural weather resistance is modified as “in many countries, Florida atmospheric corrosion test station is selected for natural weather resistance test. In China, Qionghai atmospheric corrosion test station in Hainan has a similar atmospheric condition to Florida, but there is a difference between the test result of Qionghai and that of Florida.” (see 5.4.6.2; 5.4.6.2 in Edition 2008);
——inspection method for appearance quality is modified (see 5.5; 5.5 in Edition 2008);
——requirements for batching are modified (see 6.2; 6.2 in Edition 2008);
——inspection classification is added (see 6.3);
——requirements for inspection items are modified (see 6.4; 6.3 in Edition 2008);
——requirements for sampling are modified (see 6.5; 6.4 in Edition 2008);
——judgment requirements for inspection result are modified (see 6.6; 6.5 in Edition 2008);
——requirements for marking are modified (see 7.1.1; 7.4 in Edition 2008);
——requirements for packaging are modified (see 7.2; 7.3 in Edition 2008);
——contents of quality certificate are modified (see 7.4; 7.2 in Edition 2008);
——contents of order (or contract) are modified (see Clause 8; Clause 8 in Edition 2008);
——contents of quality guarantee are added (see Annex A);
——protective measures for profiles during transportation and use are modified (see Annex B; Annex B in Edition 2008);
——"Bibliography" is added (see Bibliography).
This part was proposed by China Petroleum and Chemical Industry Federation.
This part is under the jurisdiction of National Technical Committee on Nonferrous Metals of Standardization Administration of China (SAC/TC 243).
The previous edition of standard replaced by this part are as follows:
——GB/T 5237-1985, GB/T 5237-1993 (anodized and colored profiles);
——GB/T 5237.2-2000, GB 5237.2-2004 and GB 5237.2-2008.
Wrought aluminium alloy extruded profiles for architecture - Part 2: Anodized profiles
1 Scope
This part of GB/T 5237 specifies the terms and definitions, requirements, test methods, inspection rules, marking, packaging, transportation, storage and quality certificate as well as content of order (or contract) of anodized profiles.
This part is applicable to the anodized, electrolytic colored or dyed wrought aluminium alloy extruded profiles for architecture (hereinafter referred to as profiles).
Other aluminum alloy processed materials with the same application and surface treatment method may be implemented by reference to this part.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 3199 Wrought aluminium and aluminium alloy products - Packing marking transporting and storing
GB/T 4957 Non-conductive coatings on non-magnetic basis metals - Measurement of coating thickness - Eddy current
GB/T 5237.1 Aluminium alloy extruded profiles for architecture - Part 1: Mill finish profiles
GB/T 6461 Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates - Rating of test specimens and manufactured articles subjected to corrosion tests
GB/T 6462 Metallic and oxide coatings - Measurement of coating thickness - Microscopical method
GB/T 8005.3 Aluminium of aluminium alloys - Terms and definitions - Part 3: Surface treatment terms
GB/T 8013.1 Anodic oxide coatings and organic polymer coatings on aluminium and its alloys - Part 1: Anodic oxide coatings
GB/T 8014.1 Anodizing of aluminium and its alloys - The measuring method of thickness of anodic oxide coatings - Part 1: The measuring principle
GB/T 8753.1 Anodizing of aluminium and aluminium alloys - Assessment of quality of sealed anodic oxide coatings - Part 1: Phosphoric acid/chromic acid test without nitric acid predip
GB/T 9276 Methods of exposure to natural weathering of coating
GB/T 12967.3 Test Methods for anodic oxidation coatings of aluminium and aluminium alloys - Part 3: Copper accelerated acetic acid salt spray test (CASS test)
GB/T 12967.4 Test methods for anodic oxidation coatings of aluminium and aluminium alloys - Part 4: Determination of the comparative fastness to ultraviolet light and heat of coloured anodic oxidation coatings
GB/T 12967.6 Test Methods for anodic oxidation coatings of aluminium and aluminium alloys - Part 6: Determination of color differences and appearance of colored anodic oxide films by viewing method
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 8005.3 and the following apply.
3.1
exposed surfaces
visible surfaces of profiles processed, assembled and installed on the building, including in an open or closed state
4 Requirements
4.1 Product classification
4.1.1 Designation, state and dimensional specification
Designation, state and dimensional specification shall meet the requirements of GB/T 5237.1.
4.1.2 Types and characteristics of surface texture
See Table 1 for the types and characteristics of surface texture.
Table 1 Types and characteristics of surface texture
Texture types Texture characteristics
Smooth surface Surface texture basically similar as that of mill finish profiles
Abrasive surface Surface texture obtained by sand blasting, shot blasting or alkaline degreasing on the surface of mill finish profiles
Polished surface Smooth and shiny surface texture obtained by grinding the surface of the mill finish profiles with cloth wheels, felt wheels and sandpaper
Brushed surface Surface texture with straight lines, chaotic lines, threads, corrugations and spiral striation obtained by machining the surface of mill finish profiles by mechanical friction
4.1.3 Coating thickness level, coating color and surface treatment method
See Table 2 for the coating thickness level, coating color and surface treatment method.
Table 2 Coating thickness level, coating color and surface treatment method
Coating thickness level a, b Coating color Surface treatment method a
AA10, AA15, AA20 and AA25 Silver white Anodizing + hole sealing
Bronze, black, gold, etc. Anodizing + electrolytic coloring c + hole sealing
Anodizing + dyeing d + hole sealing
a The coating thickness level, coloring and hole sealing process have a great influence on the coating properties.
b In general, the thicker the coating, the better the salt spray corrosion resistance.
c Electrolytic coloring can only meet the customer's demand for color within a certain range.
d In general, the ultraviolet resistance of the dyed coating is inferior to that of electrolytic colored coating.
4.1.4 Labels and examples
Profiles are labeled in the order of product name, part number, designation, state, section code and length, color (or color number), surface texture type, and coating thickness level. Example:
Bronze profile with abrasive surface, coating thickness level of AA15, designation of 6063, in T5 state, section code of 421001 and specified length of 3000mm is labeled as:
Anodized profile GB/T 5237.2-6063T5-421001×3000 bronze abrasive AA15
4.2 Quality guarantee
4.2.1 Process
See A.1 for process guarantee.
4.2.2 Materials
See A.2 for the quality of mill finish profiles, chemical agents and additives for anodizing.
4.3 Chemical composition
Chemical composition shall meet the requirements of GB/T 5237.1.
4.4 Mechanical property
Mechanical property shall meet the requirements of GB/T 5237.1.
4.5 Dimensional deviation
Dimensional deviation (including the coating) shall meet the requirements of GB/T 5237.1.
4.6 Coating property
4.6.1 Coating thickness
The average and local thickness of coating shall meet the requirements specified in Table 3. The coating thickness level shall be noted in the order (or contract), otherwise, AA10 level shall be supplied.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
5 Test methods
6 Inspection rules
7 Marking, packaging, transportation, storage and quality certificate
8 Content of order (or contract)
Annex A (Informative) Quality guarantee
Annex B (Informative) Protective measures for profiles during transportation and use
Bibliography
