CB/Z 197-1982 Technical requirements for installation of ternary zinc anodes on submarine hulls CB/Z197-1982 standard download decompression password: www.bzxz.net

China State Shipbuilding Corporation Guiding Technical Document CB/Z197-82
Technical Requirements for Installation of Ternary Zinc Anodes on Submarine Hulls Published on 1983-02-01
China State Shipbuilding Corporation
China State Shipbuilding Corporation Guiding Technical Document Technical Requirements for Installation of Ternary Zinc Anodes on Submarine Hulls CB/2197-82
Part 12
This document is applicable to all types of submarines. Submarines equipped with ternary zinc anodes according to this document will have all underwater parts well protected within the 1:5~2 year docking interval. The underwater protection potential is between -0.85-0.98V (relative to copper-saturated copper sulfate reference electrode). The chemical composition of the ternary zinc anode (code ZAC) is shown in Table 1. Table
Chemical elements
Content (%) 0.3~0.6
0.05~0.15
<0,006
The anode models for submarines are shown in Table 2. The structure is shown in Figures 1 to 3. 0
China Bangbo Industry Corporation 19.83-02-01 approved the release of Zn
Anode model
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ZAC-4B
Weight kgbzxz.net
Installation location
Non-pressure hull outer surface,
Sonar transducer platform,
Chain compartment, etc.
Bow and stern non-watertight areas
Ballast water tanks and other locations above the cruising waterline
Inner surface of torpedo tube
Service life
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3The smelting process, acceptance technical conditions, etc. of ternary zinc anode shall comply with CB89078 "Zinc-Aluminum-Cadmium Alloy Sacrificial Anode".
4 The parts where the submarine is installed with ternary zinc anodes are: each ballast tank, the outer surface of the non-pressure hull, the bow and stern non-watertight area, the sonar transducer platform, the anchor chain compartment, each sea valve well, each ventilation cover, the fast diving compartment, the superstructure, the command room enclosure, each internal liquid tank, the inner surface of the stabilizer wing, the inner surface of the rudder plate, the underwater exhaust pipe port, the periscope well, the simulated ammunition well, the inner surface of each torpedo tube, etc. When the submarine is in use, in the cruise state, all parts underwater use ZAC-0 anodes except the bow and stern non-watertight areas. The service life is two years. ZAC-4B anodes are used for the parts above the cruise waterline, and the service life is 6 years.
The number of anodes is obtained by the following formula:
Where: S is the immersion area of ​​the protected component, m; i is the protection current density of the protected component, A/m2; the current generated at each anode is A.
The selection of protection current density (1b) is shown in Table 3: Table 3 Protected parts
Outer surface of non-pressure hull
Ballast water tank
Non-watertight area at bow and stern
Sonar dome
Propeller
Marine steel
Marine steel
Marine steel
Marine steel
Stainless steel
Copper alloy
Painting condition
Painting is difficult,
Serious damage
Paint film is damaged by erosion
Only antifouling paint is applied
Protective current density A/m2
The current generated at the anode is shown in Table 4.
Anode model
ZAC-4B
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Generated current (A/piece)
Anode quantity: The calculated number of anodes should be evenly arranged on the protected component or around it. The anodes on the outer surface of the non-pressure hull are evenly distributed on the contour lines of the horizontal stabilizer wings on both sides of it; the anodes required for the sonar dome and propeller are arranged on the bright body around them; the anodes in the ballast tank are evenly arranged in layers. Special parts such as the ventilation top cover, periscope well, simulated ammunition well, exhaust pipe mouth, and the inner surface of the rudder plate, etc. can be selected according to the structure. The location where it is often flooded and convenient for construction can be selected.
When installing the submarine ternary zinc anode, except for the periscope well fixed with anode screws, all are fixed by welding. During installation, the back of the anode is close to the protected component. It is strictly forbidden to paint or stain the anode action surface with oil.
Before installing the ternary zinc anode, apply two layers of anti-rust paint on the back. The anode in the cruise state is replaced during dock repair, and the other anodes are replaced during repair. 12 Underwater hull potential measurement, commonly used cancellation potentiometer and copper-saturated copper sulfate reference electrode. See Figure 4 and Figure 5.
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Comparison model
Figure 4 Circuit diagram of cancellation potentiometer
In the figure: E Working power supply number battery
K Power switch
R1—50. ohm potentiometer
R21~2 hand ohm potentiometer
V0~1.5V voltmeter
MA—Zero type +50-0-50 microampere meter
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Figure 5 Copper-saturated and copper sulfate reference electrode
In the figure: 1-wire;
2-top pressure surface of organic glass;
3-organic glass pressure cover;
4-filler paraffin + 30~50% rosin;
59, 10 rubber washers;
6-copper fixing nut;
7-copper rod;
8-simple shell (organic glass);
11 semi-permeable membrane, material ginkgo wood;
12-organic glass bottom cover.
13When measuring the hull potential, the negative end of the potentiometer is connected to the hull, the positive end is connected to the reference electrode, the switch is closed, the potentiometer is adjusted, the microammeter points to zero, and the voltmeter value is read. The measuring points can be measured at four points on the left and right sides, the protection potential is -0.85~-0.98V, and the potential deviation of each point is less than or equal to 0.04V. Additional notes:
This document is under the jurisdiction of the 719th Institute.
This document was drafted by the 725th Institute, and the main drafter of this document is Chen Renxing.
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