This standard specifies the specifications, models, requirements, test methods, inspection rules and markings, packaging, transportation and storage of aluminum-zinc-indium alloy sacrificial anodes. This standard applies to the design, production and inspection of sacrificial anodes for cathodic protection in industrial fields such as ships, port and marine engineering facilities, seawater cooling systems and tank sedimentation water parts in seawater media. The design, production and inspection of sacrificial anodes for cathodic protection of other steel structures in corrosive media such as seawater, desalinated water and sea mud can also be used as a reference. GB/T 4948-2002 Aluminum-zinc-indium alloy sacrificial anodes GB/T4948-2002 standard download decompression password: www.bzxz.net

UDC 66 9.715' 6' 872: 621. 35.0a5.2+ 549. 06 National Standard of the People's Republic of China
GB4948~4949—85
Sacrificial anode of Al - Zn- In systemalloy and chemical analysis
Published on February 4, 1985
National Standard Implemented on October 1, 1985
National Standard of the People's Republic of China
Sacrificial anode of Al-Zn-In system alloyUDC 669.715' 5'
872: 621.35
.0a5.2
GB4948—85
This standard applies to the cathodic protection of marine engineering facilities, port facilities and ships in seawater, and also to the cathodic protection of metal structures in fresh water and sea mud.
Terms and terms
See GB4950—85 "Zinc-Aluminum Alloy Cathodic Protection". 2 Model specifications and main dimensions
Sacrificial anode model specifications are shown in Table 1 and Table 2
Ocean secondary, port facilities, sacrificial anode model specifications for seawater ballast tanks Table 1
(1 bottom - lower bottom) × length × height, mm
AZI-- HI
A7I-E-H2
Az,I - . 1- H3
AZI--H4
AZ1-1- H5
AzT - C- H6
A21 - 1.J- 117
AZ1--H8
AzI-1- H9
AZI-[-H10
AzI - C- H11
AZI--H12
(220 +240) 5)×125×130
(150 +170) × 90(1 ×160
(115 +135) ×500×130
（110-130）×500×120
(52 + 58 ) ×1100× 56
National Bureau of Standards 1985-02-4 Release
Weekly determination method
Spiral twisted pipe
Threaded steel
.Steel plate
Quality, kr
1985-10-01 implementation
AZI··CI
AzI- II- C2
AZT-.-- C3
AZ1-1. -G4
AZ1 .-E--C5
A7z1--C6
AZ1--C7
AZ-0-C8
Azi -- Cg
AZI C10
AZI -C1E
Az1-E-C12
GB 4948--85
Table 2 Model and specification of marine sacrificial anode
Fixing method
Length × width × width, mm
800×140×40
500×100×40
400×120×35
400×100×35
30) ×110×3
25×100 ×35
t80×70×35
180×80×12
280 × 160 × 70
230 × 75.× 40
180 × 0 × 30
Climbing nail determination
Bi core
Mass, kg
2.zThe structure and main dimensions of the anode are shown in Figure 1B
A2E -[3-1H11
AZ1 --H2
AzI --H3
AZI --H6
Figure 1 AzI --HI
6 Sacrificial anode
Steel section
114×8
$·102 × 6
@76×5
Threaded steel core
AzI -Li- H4
AZI -□-HS5
AZI-[-H?
Az1 --H8
GB4948-86
A21 -[-H4 ~ 5.
7～810 Sacrificial galvanic pole
A21 --H9
AzI --H11
AzI -- H12
Ahang core shortage
GB4848—85
AZ1-□-H9, 11~12 sacrificial cathode
5 ± 1
60 ± 1
28 ± 1
Xie board coated core
AZ1 --CI
AzI -~C2
AZI-C4
4948—85
Figure 4 Az1 -]- C 1 ~ 2. 4 sacrificial cathode H
AzI --C3
AzI -]-C5
AzI-E-C6
A2F-C8
GB4948---B5
Figure 6A21
8 sex floor
A2[ -_i-C 9 handle anode
AzI-i-C10
Az[ -[I-C11
Az1 --C12
Tree iron control
GB4948—85
-C10~12 Special anodes
Sacrificial anode model specification
GB494B
Represents sacrificial anode specifications
Represents sacrificial anodes for different purposes;
Meiyang engineering, port facilities,
Sacrificial anodes for seawater ballast tanks;
Marine sacrificial anodes
Represents the addition of other alloy elements
Cd Mg- ...
3 Raw materials
Aluminum purity shall not be lower than the provisions of A1-00 in GB1196-75 "Aluminum Ingot". 3.2 Zinc purity shall not be lower than the provisions of Zπ-1 in Article 1.1 of GB 470-83 "Zinc Ingot". 9.8 Indium purity shall not be lower than 99.9%.
3.4 ​​Purity shall not be lower than the provisions of Cd-2 in GB 914-66 "Classification and Technical Conditions". 3.5 Tin purity shall not be lower than the provisions of Sn-1 in GB72865 "Classification and Technical Conditions of Tin". Magnesium purity shall not be lower than the provisions of Mg-1 in YB86-60 "Classification and Technical Conditions of Magnesium". 8.6
Technical requirements
4.1 Chemical composition
The chemical composition of sacrificial anode shall conform to the requirements of Table 3. Chemical composition of sacrificial anode Aluminum-zinc-indium alloy sacrificial anode (AzI-Cd) Aluminum-zinc-indium alloy (AZI-Sn) Aluminum-zinc-indium-silicon (AZI-Si) Lead-zinc-calcium-magnesium (A2I-SnMg) CB4948-1140 ... 035
4.00.020-0.050
005~0.020
0,018~ 0.035
20.160.02 Residue
<0.13<0.14.0.02 Residue
0.10~0.150.160.02 Residue
0. 025. ~ 0. 075 10. 50 ~ 1. 004.2 Electrochemical properties
The electrochemical properties of the lead-zinc-steel alloy anode shall comply with the requirements of Table 4. Table 4 Aluminum
Electrochemical properties
Open circuit potential
-1.18~ -1.10
Zn-In alloy anode electrochemical performance test electrode
1.12~-1.05
Note: ① Reference electrode: saturated electrode. ② Medium: artificial water. wwW.bzxz.Net
4.8 Iron core
Actual electric current
Ah/kg
≥2400
Current efficiency
4.$.1 Steel pipe iron core: The material should comply with the provisions of YB231-70 "Seamless Steel Pipe". c.0.13
Dissolution condition
Etch products are easy to fall off, and the surface dissolution is uniform. 4.3.2
Threaded steel core, the material should comply with the provisions of GB1499--79 "Hot-rolled steel bars". Steel plate core: The material should comply with the provisions of 4.8.3 of GB912-82 "Technical conditions for ordinary carbon structural steel and low alloy structural thin steel plate". The surface of the iron core is clean and calcium-free, and can be galvanized or sandblasted. 4.4 Surface quality 4.4.1 The surface of all types of sacrificial anodes is a casting surface, and the positive side of the sacrificial anode is free of oxide slag, dry burrs, and dead cracks. The remaining surfaces of the sacrificial anode are allowed to have transverse fine cracks with a length of no more than 51 mm and a depth of no more than 6 mm, but crack clusters are not allowed. The maximum size of the surface depression shall not exceed 10% of the maximum thickness of the sacrificial anode. 4.2 The working surface of the sacrificial anode shall be kept very clean and free of paint and oil. 4.5 Contact resistance between the sacrificial anode substrate and the iron core The contact resistance between the sacrificial anode body and the iron core shall be less than 0.00192. 4. See Appendix A (reference) for the metallographic structure of the sacrificial anode of the zinc-steel alloy. 11
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