GB/T 23612-2017 English PDF (GB/T23612-2017)

GB/T 23612-2017: Technical Specification for Process of Anodizing and Electrophoretic Painting on Aluminum Alloy Extruded Profiles for Architecture
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GB/T 23612-2017
NATIONAL STANDARD OF THE
PEOPLE’S 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’s 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 protecti...