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GB/T 23612-2017 English PDF (GBT23612-2017)

GB/T 23612-2017 English PDF (GBT23612-2017)

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GB/T 23612-2017: Technical specification for process of anodizing and electrodeposition painting on aluminium alloy extruded profiles for architecture

This Standard stipulates the terms, definitions, typical process flow chart, equipment requirements, quality requirement of mill finish profiles, manufacturing process requirements, process parameter control and product quality control of the technical specification for process of anodizing and electrophoretic painting on aluminum alloy extruded profiles for architecture. This Standard is applicable to the manufacturing process for the processing of anodizing or anodizing electrophoretic painting (water-soluble varnish or colored painting) on the surface of aluminum alloy extruded profiles for architecture.
GB/T 23612-2017
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 25.220.01
H 61
Replacing GB/T 23612-2009
Technical Specification for Process of Anodizing and
Electrodeposition Painting on Aluminum Alloy
Extruded Profiles for Architecture
ISSUED ON: JULY 12, 2017
IMPLEMENTED ON: APRIL 1, 2018
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 7
4 Typical Process Flow Chart ... 7
5 Equipment Requirements ... 8
6 Quality Requirement of Mill Finish Profiles ... 13
7 Manufacturing Process Requirements ... 13
8 Monitoring of Process Parameters ... 22
9 Product Quality Control ... 23
Foreword
This Standard was drafted in accordance with the rules in GB/T 1.1-2009. This Standard serves as a replacement of GB/T 23612-2009 Anodizing and
Electrophoretic Painting Technical Specification on Wrought Aluminum Alloy Extruded Profiles for Architecture. In comparison with GB/T 23612-2009, except from editorial modifications, there are several main technical changes as follows:
---The typical process flow chart is transferred to the space prior to equipment requirements (please refer to Chapter 4; 6.1.5 in Version 2009);
---In the typical process flow chart on anodizing (Figure 1), a rinsing process is added between neutralization and dyeing; a rinsing process is added between hole sealing and cold sealing post-treatment. Direct connection to water rinsing 1 after electrolytic coloring through the process of anodizing without electrolytic coloring is modified into direct connection to the process of hole sealing through water rinsing 2 after the process of anodizing (please refer to Chapter 4; 6.1.5 in Version 2009);
---In the typical process flow chart on anodizing electrophoretic painting (Figure 2), direct connection to water rinsing 1 after electrolytic coloring through the process of anodizing without the process of electrolytic coloring is modified into direct connection to hot water rising before electrophoretic painting through water rinsing 2 after the process of anodizing (please refer to Chapter 4; 6.1.5 in Version 2009);
---The stipulations regarding the processing of groove materials are modified (please refer to 5.1.1.2; 4.1.1.1 in Version 2009);
---The requirements towards anodizing electrolyte agitation equipment are modified (please refer to 5.1.3; 4.1.3 in Version 2009);
---The requirements towards anodizing power supply are modified (please refer to 5.1.5.2; 4.1.5.2 in Version 2009);
---The requirements towards automatic fault diagnosis and protection system for anodizing power supply unit are added (please refer to 5.1.5.3);
---The process of installing recovery unit is modified (please refer to 5.1.6.1; 4.1.6.1 in Version 2009);
---Recovery unit, which is recommended to be installed by the recyclable process, is modified (please refer to 5.1.6.2; 4.1.6.2 in Version 2009);
---The stipulations of devices that waste-water treatment equipment shall be equipped with are modified (please refer to 5.1.6.3; 4.1.6.3 in Version 2009); ---The requirements towards the cross-sectional area of aluminum hanger are added (please refer to 5.1.7.2);
---The requirements towards hanger design are modified (please refer to 5.1.7.3; 4.1.7.2 in Version 2009);
---The requirements towards curing oven are modified (please refer to 5.1.8; 4.1.8 in Version 2009);
---The requirements towards suitable materials for conductive cathode plate are modified (please refer to 5.1.9.1; 4.1.9.1 in Version 2009);
---The stipulations regarding workshop air cleaning unit are modified (please refer to 5.1.10; 4.1.10 in Version 2009);
---The inspection equipment used for the inspection item ?€?abrasive resistance?€? in Table 1 is modified (please refer to 5.2; 4.2 in Version 2009);
---The requirement that water rinsing tank should consider the cyclic utilization of water is added (please refer to 7.1.4);
---The requirement of water rinsing treatment before anodizing is added (please refer to 7.1.5);
---The requirement of water rinsing treatment after anodizing is added (please refer to 7.1.6);
---The stipulations of Ni2+ treatment in nickel-containing waste-water are added (please refer to 7.1.8);
---Some process parameters in Table 2 are modified (please refer to 7.1.8; 6.1.5 in Version 2009);
---The stipulation that ash-removal solution should not contain fluorine-containing ions, hexavalent chromium ions or other detrimental heavy metal ions is added (please refer to 7.2.3.3);
---The stipulation that ?€?the process of electrolytic coloring should adopt mono- nickel salt coloring process, which is equipped with nickel recovery unit?€? is added (please refer to 7.4.2);
---The stipulation that ?€?the hole-sealing process should gradually develop from nickel-containing and fluorine-containing cold hole-sealing process or medium- temperature hole-sealing process into nickel-free and fluorine-free cold hole- sealing process or medium-temperature hole-sealing process; it may also develop into thermal hole-sealing process?€? is added (please refer to 7.5.1.2); ---The stipulation of medium-temperature hole-sealing process is modified (please refer to 7.5.3; 6.5.3 in Version 2009);
---The stipulation of the influence of excessive solid fraction on painting is modified (please refer to 7.6.2; 6.6.1 in Version 2009);
---The stipulation of the influence of electrophoresis voltage on painting is modified (please refer to 7.6.5; 6.6.4 in Version 2009);
---The influence when the cathode-anode area ratio is inappropriate is modified (please refer to 7.6.7; 6.6.6 in Version 2009).
This Standard was proposed by China Nonferrous Metals Industry Association. This Standard shall be under the jurisdiction of National Technical Committee 243 on Nonferrous Metals of Standardization Administration of China (SAC/TC 243). The drafting organizations of this Standard: Guangdong JMA Aluminum Profile Factory (Group) Co., Ltd., Fine Chemicals Group Co., Ltd., China Nonferrous Metals Techno- Economic Research Institute, Tianjin New AL-ONE Tech Co., Ltd., Guangdong HAOMEI Aluminum Co., Ltd., Guangdong FENGLU Aluminum Co., Ltd., Fujian MINFA Aluminum Inc., Fujian Nanping Aluminum Co., Ltd., Guangdong XINGFA Aluminum Holdings Limited, Guangdong Xinhe Aluminum Co., Ltd., Foshan Nanhai Huahao Aluminum Profile Co., Ltd., Guangdong Huachang Aluminum Factory Co., Ltd. The main drafters of this Standard: Dai Yuexing, Jin Honghai, Ge Lixin, Shi Hongwei, Xiang Shengqian, Chenhui, Zhu Yaohui, Xie Zhijun, Chen Wensi, Xiang Wenhua, Zhu Shuiming, Tang Xingyu.
The issuance of the previous versions of the standard being replaced by this Standard is as follows:
---GB/T 23612-2009.
Technical Specification for Process of Anodizing and
Electrophoretic Painting on Aluminum Alloy Extruded
Profiles for Architecture
1 Scope
This Standard stipulates the terms, definitions, typical process flow chart, equipment requirements, quality requirement of mill finish profiles, manufacturing process requirements, process parameter control and product quality control of the technical specification for process of anodizing and electrophoretic painting on aluminum alloy extruded profiles for architecture.
This Standard is applicable to the manufacturing process for the processing of anodizing or anodizing electrophoretic painting (water-soluble varnish or colored painting) on the surface of aluminum alloy extruded profiles for architecture. 2 Normative References
The following documents are indispensable to the application of this document. In terms of references with a specific date, only versions with a specific date are applicable to this document. In terms of references without a specific date, the latest versions (including all the modification lists) are applicable to this document. GB/T 4957 Non-conductive Coatings on Non-magnetic Basis Metals - Measurement of Coating Thickness - Eddy Current
GB/T 5237.1 Wrought Aluminum Alloy Extruded Profiles for Architecture - Part 1: Mill Finish Profiles
GB/T 5237.2 Wrought Aluminum Alloy Extruded Profiles for Architecture - Part 2: Anodized Colored Profiles
GB/T 5237.3 Wrought Aluminum Alloy Extruded Profiles for Architecture - Part 3: Electrophoretic Coating Profiles
GB/T 8005.3 Aluminum and Aluminum Alloys - Terms and Definitions - Part 3: Surface Treatment
GB/T 9286 Paints and Varnishes - Cross Cut Test for Films
3 Terms and Definitions
Terms and definitions defined in GB/T 8005.3 are applicable to this document. 4 Typical Process Flow Chart
Typical process flow chart on anodizing is shown in Figure 1. Typical process flow chart on anodizing electrophoretic painting is shown in Figure 2.
Figure 1 -- Typical Process Flow Chart on Anodizing
Water
Rinsing 7
Water
Rinsing 8
Water
Rinsing 1
Water
Rinsing 2
Water
Rinsing 3
Water
Rinsing 4
Water
Rinsing 5
Water
Rinsing 6
Water
Rinsing 9
Water
Rinsing 10
Water
Rinsing 14
Water
Rinsing 15
Water
Rinsing 12
Water
Rinsing 11
Water
Rinsing 13
Hole-
sealing
Ash-
removal
Post-cold-hole-
sealing Treatment
Dyeing
Anodizing
Degreasing
Electrolytic
Coloring
Neutralizati
on
Load Mill
Finish Profile
Unload Profile
Alkali
Rinsing
Figure 2 -- Typical Process Flow Chart on Anodizing Electrophoretic Painting 5 Equipment Requirements
5.1 Manufacturing Equipment
5.1.1 Processing tank
5.1.1.1 Type of processing tank
Processing tank includes pretreatment tank (including degreasing tank, alkali rinsing tank and dust-removal tank), anodizing tank, electrolytic coloring tank, neutralization tank, dyeing tank, hole-sealing tank, post-cold-hole-sealing processing tank, electrophoretic painting tank and water rinsing tank, etc.
5.1.1.2 Materials and layout of processing tank
The lining material that the processing tank adopts shall not be corroded or contaminated by tank solution. The layout of the processing tank shall be reasonable. It shall prevent tank solution from being contaminated.
5.1.1.3 Capacity of processing tank
The capacity of the processing tank shall satisfy the requirements of manufacturing. In addition, it shall guarantee that the requirements of process parameters (such as Water
Rinsing 7
Water
Rinsing 8
Water
Rinsing 1
Water
Rinsing 2
Water
Rinsing 3
Water
Rinsing 4
Water
Rinsing 9
Water
Rinsing 5
Water
Rinsing 6
Water
Rinsing 10
Water
Rinsing 11
Water
Rinsing 12 Cooling
Alkali
Rinsing
Ash-
removal
Hot Water
Rinsing
Anodizing
Load Mill
Finish Profile
Unload Profile
Degreasing
Pure Water
Rinsing
Curing Drip-dry Electrophoretic Painting
Electrolytic
Coloring
electric current density and temperature) are satisfied.
5.1.2 Cooling equipment of anodizing electrolyte
Cooling equipment shall be able to absorb the heat generated during the electrolytic process and guarantee that the requirements of process temperature are satisfied. Under the circumstance of normal manufacturing, the equipment?€?s cooling capacity should reach the requirement in Formula (1):
Where,
K---cooling capacity, expressed in (J/h);
I---maximum current, expressed in (A);
V---maximum voltage, expressed in (V).
5.1.3 Agitation equipment of anodizing electrolyte
Anodizing electrolyte shall be properly agitated, so as to reach the effect of heat dissipation, and guarantee that the temperature of the electrolyte maintains uniformly stable. Generally speaking, the mode of agitation shall adopt Roots blower air agitation, circulating pump agitation, or a combination of Roots blower air agitation and circulating pump agitation. When air agitation is adopted, the air for agitation shall contain no grease; the amount of air agitation for each square meter of electrolyte surface area shall be not less than 5 m3/h, and preferably 12 m3/h. When circulating pump agitation is adopted, the circulating capability of the circulatory system shall be 2.5 ~ 4.0 times of the volume of the electrolyte per hour.
5.1.4 Heating equipment
In order to guarantee that the tank solution?€?s manufacturing temperature reaches the process requirements, heating equipment shall be installed on processing tank which needs to be heated. In addition, the heating capability of the heating equipment is requested to guarantee that the tank solution?€?s temperature is controlled within the range of the process requirements.
5.1.5 Power supply equipment
5.1.5.1 Power supply equipment shall satisfy the manufacturing requirements. Power supply equipment shall install corresponding voltmeter and ampere meter. The minimum scale of the voltmeter shall be not more than 2% of the nominal value; the minimum scale of the ampere meter shall be not more than 5% of the nominal value. Furthermore, the voltmeter and ampere meter need to be validated and calibrated in accordance with the stipulated cycle of validation and calibration; the level of accuracy shall reach Level-1.5.
5.1.5.2 Generally speaking, anodizing power supply shall adopt direct current (DC) oxidizing power supply. Under general circumstances, silicon-controlled rectifier (SCR) or rectifier controlled by sliding brush automatic transformer is adopted to provide direct current in industry. The voltage drop from the anodizing power supply to tank-side busbar shall be not more than 0.3 V. The temperature rise at the conductive contact between the anode beam and the conductive seat shall be not more than 30 ??C. 5.1.5.3 Anodizing power supply unit shall be equipped with an automatic fault diagnosis and protection system against overcurrent, default phase, output short circuit and equipment overtemperature, so as to guarantee equipment?€?s safe operation. 5.1.5.4 Electrophoretic painting?€?s DC power supply unit shall be equipped with an automatic fault diagnosis and protection system against overcurrent, default phase, output short circuit and equipment overtemperature, so as to guarantee equipment?€?s safe operation. The ripple coefficient shall be less than 5%.
5.1.6 Recovery unit and waste-water treatment unit
5.1.6.1 Electrophoretic painting process and mono-nickel salt coloring process shall install recovery unit.
5.1.6.2 Processes that implement recycling, such as anodizing pretreatment process and anodizing process, should install recovery unit (such as sulfuric acid recovery unit, alkali recovery unit and secondary water utilization unit, etc.).
5.1.6.3 When waste-water is handled by manufacturers, anodizing profile manufacturers shall be equipped with corresponding waste-water treatment equipment (treatment devices like acid-base neutralization, flocculation, sedimentation and filter pressing). Anodizing electrophoretic painting profile manufacturers shall also be equipped with COD treatment unit (for example, elimination of COD through ozone or biological algae).
5.1.7 Hanger
5.1.7.1 Hanger shall have favorable electrical conductivity, so as to guarantee the satisfying and uniform conduction of working current to each aluminum alloy profile for architecture.
5.1.7.2 The cross-sectional area of aluminum hanger, which is soaked into the anodizing tank solution, shall be sufficiently large, so as to guarantee that in normal operation, the aluminum hanger?€?s electric current density shall be not more than 5 A/mm2.
5.1.7.3 In the design of hanger, cross contamination among tank solutions shall be prevented.
5.1.8 Curing oven
5.1.8.1 Curing oven shall install temperature controller. The temperature controller shall be able to directly display temperature data inside the oven. The heating zone of the curing oven shall install an overtemperature alarming system.
5.1.8.2 Under normal operation, the temperature difference of the curing oven should not be higher than 20 ??C.
5.1.8.3 Curing oven?€?s operating temperature range shall satisfy the requirement of painting curing temperature.
5.1.9 Conductive cathode plate
5.1.9.1 Conductive cathode plate shall select suitable materials. For instance, anodizing cathode plate may select pure aluminum plate; electrolytic coloring cathode plate may select pure nickel plate or stainless-steel plate; electrophoretic cathode plate may select stainless-steel plate.
5.1.9.2 The surface area of the conductive cathode plate shall match with the designed and processed profile area, and the rated processing capacity of the rectifier. 5.1.9.3 The conductive cathode plate shall be reasonably arranged, so as to guarantee that electric current is uniformly distributed.
5.1.9.4 Anodizing and electrophoretic cathode plate shall be equipped with an electrode cover.
5.1.10 Workshop air cleaning unit
In zones of pretreatment process, anodizing treatment process, electrophoretic painting process and curing process, air ventilation and purification facilities shall be installed, so as to guarantee the internal environment in the workshop and avoid contamination of air.
5.2 Inspection Equipment
In accordance with different inspection items, inspection equipment shall be divided into instruments and equipment for daily inspection, and instruments and equipment for periodical inspection. Please refer to Table 1 for details.
Table 1 -- Instruments and Equipment for Daily Inspection; Instruments and Equipment for Periodical Inspection
Classification
of Instruments
and Equipment
Inspection
Items
Analytical Instruments
and Inspection
Equipment
Remarks
Instruments
and Equipment
for Daily
Tank Solution
Analysis
Analytical balance,
constant-temperature
drying oven, acid
The division value of analytical
balance is 0.0001 g.
Inspection burette, alkali burette,
transfer pipette,
volumetric flask,
acidimeter, ion meter
and conductometer, etc.
Film Thickness Eddy current thickness meter
1. The measurement range of eddy
current thickness meter shall be not
less than the range of coating
thickness;
2. The accuracy requirement of
eddy current thickness meter shall
reach the stipulations in GB/T 4957.
Hole-sealing
Quality
Constant-temperature
water bath kettle or
constant-temperature
kettle, analytical
balance, constant-
temperature drying oven
The temperature-control sensitivity
of constant-temperature drying
oven, constant-temperature water
bath kettle or constant-temperature
kettle shall be ??? 1 ??C.
Painting
Hardness
High-grade drawing
pencil
This is a requisite inspection
equipment for anodizing
electrophoretic painting factories. It
is unnecessary in factories with
merely anodizing treatment.
Painting
Adhesiveness
Cross cutter, adhesive
tape
1. Cross cutter and adhesive tape
shall comply with the stipulations in
GB/T 9286; blade spacing of the
cross cutter shall be 1 mm;
2. Cross cutter is a requisite
inspection equipment for anodizing
electrophoretic painting factorie...

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