This standard specifies the classification, marking, requirements, test methods, inspection rules, marking, packaging, transportation and storage of reference electrodes for cathodic protection of steel seagoing vessels. This standard applies to the manufacture and acceptance of reference electrodes. The manufacture and acceptance of reference electrodes for cathodic protection of other steel structures in seawater can also be used as a reference. GB/T 7387-1999 Technical conditions for marine reference electrodes GB/T7387-1999 Standard download decompression password: www.bzxz.net

ICS47.020.05
GB-T7387-1999 Technical requirements for marine reference electrode GB
National Standard of the People's Republic of China
GB/T7387--1999
Technical reguirements for marine reference electrode
Technical reguirements for marine reference electrode1999-08-31Promulgated
Implementation on 2000-06-01
Promulgated by the State Administration of Quality and Technical Supervision
GB/T7387-1999
This standard is a revision of GB/T7387-1987 "Technical requirements for marine reference electrode". The main technical differences between this standard and GB/T7387-1987 are as follows: Addition of mesh silver/silver chloride and high purity zinc reference electrodes and corresponding technical requirements, electrode structure, test methods and inspection rules, etc. According to the use requirements of ships, the service life index of the reference electrode has been improved. : Deleted Appendix A "Preparation of cylindrical silver/silver chloride electrode body by powder pressing method", Appendix B\Preparation of spiral silver/silver chloride electrode body by hot dip coating method", Appendix C "Preparation of zinc aluminum silicon electrode body", Appendix D "Preparation of copper/saturated copper sulfate electrode body" in GB/T7387-1987.
This standard is used in conjunction with GB/T3108-1999 "Ship External Impressed Current Cathodic Protection System". This standard will replace GB/T7387-1987 from the date of implementation. Appendix A, Appendix B and Appendix C of this standard are all suggested appendices. This standard was proposed by the Marine Material Application Technology Sub-Technical Committee of the National Technical Committee for Standardization of Marine Ships. This standard is under the jurisdiction of the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation. This standard was drafted by the Luoyang Ship Material Research Institute of China State Shipbuilding Corporation and the Shanghai Ship and Transportation Science Research Institute of the Ministry of Communications. The main drafters of this standard are Gao Yuzhu, Li Guihua, Dong Fengying, Xu Jianhua, Zhang Huanrong and Wang Zaizhong. This standard was first issued in March 1987.
1 Scope
National Standard of the People's Republic of China
Technical requirements for marine reference electrode
Technical requirements for marine reference electrode GB/T7387—1999
Replaces GB/T7387--1987
This standard specifies the classification, marking, requirements, test methods, inspection rules, marking, packaging, transportation and storage of reference electrodes for cathodic protection of steel seagoing ship hulls.
This standard is applicable to the manufacture and acceptance of reference electrodes. The manufacture and acceptance of reference electrodes for cathodic protection of other steel structures in seawater can also be used as a reference.
Cited Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB191-1990
Packaging Storage and Transportation Pictorial Marking
GB/T470—1997
GB/T1173—1995
GB/T1196—1993
Casting Aluminum Alloy
Aluminum Ingots for Remelting
GB4135—1994Silver Ingots
GB/T4423—1992
GB/T4951-1985
GB/T5231-—1985
Copper and Copper Alloys Gold drawn rods
Zinc-aluminum-cadmium alloy sacrificial anode chemical analysis method chemical composition and product shape
Processing copper 1
GB/T12689.1-1990
method EDTA titration method for determining aluminum content
Chemical analysis method for zinc and zinc alloys
CB/T3667.1—1995
3 Classification and marking
3.1 Classification
Ship cable laying and electrical equipment installation accessories Cable penetration device Commonly used reference electrode types and models are shown in Table 1. According to the electrode body material, it can be divided into three categories: silver/silver chloride reference electrode, zinc and zinc alloy reference electrode and copper/saturated copper sulfate reference electrode. Approved by the State Administration of Quality and Technical Supervision on August 31, 1999 and implemented on June 1, 2000
GB/T7387-1999
Table 1 Common types and structural types of reference electrodes Structural type
Cylindrical (powder pressing method)
Spiral (hot dip coating method)
Silver/silver chloride reference electrode
High purity zinc reference electrode|| tt||Zinc-aluminum-silicon reference electrode
Copper/saturated copper sulfate reference electrode
3.2 Model representation
The model representation of the reference electrode is as follows:
Cylindrical (powder pressing method)
Spiral (hot dip coating method)
Network (hot dip coating method)
Network (hot dip coating method)
Disc-shaped
Disc-shaped|| tt||Cylindrical
Structural type code, see Table 1
Installation type
Fixed
Fixed
Portable
Fixed
Portable
Fixed
Fixed
Portable
Type code: Y-silver/silver chloride reference electrode X-zinc and zinc alloy reference electrode
T-copper/saturated copper sulfate reference electrode
Reference electrode
3.3 Structural type
The structural type of the reference electrode is shown in Table 1 and Figures 1 to 6. 12
Reference electrode body
Service life a
1-hull; 2-stuffing tube; 3-sealing body; 4-electrode; 5-sealing sleeve ; 6-positioning screw; 7-pressing screw; 8-pressing nut; 9--elastic retaining ring for hole; 10-washer; 11-plug seal; 12-washer; 13-pressing nut; 14-cable; 15-plug; 16--rubber ring; 17-washerFig. 1Schematic diagram of the structure of CCY-1 and CCY-5 silver/silver chloride reference electrodes
GB/T7387-1999
1 Watertight; 2-terminal; 3-upper flange; 4-rubber pad; 5-hull; 6-welding flange; 7-3.5% sodium chloride solution; 8-electrode body; 9-semipermeable membrane; 10-water seepage sleeve; 11 cable; 12-cable stuffing boxFig. 2 CCY-2 silver/silver chloride reference electrode
1-cable; 2-sealing plug; 3-sealing stuffing; 4-electrode holder; 5-sealing washer; 6-terminal ; 7 sheath; 8-electrode body; 9-sealing gasket; 10- gland; 11-sealing stuffing; 12-insulating gasket; 13-nut Figure 3 CCY-3 and CCY-6 silver/silver chloride reference electrode GB/T7387-1999
1 shell: 2-electrode body: 3-sealing sleeve: 4-sealing gasket Figure; 5-sealing plug: 6-sealing stuffing: 7 cable Figure 4 CCY-4 silver/silver chloride reference electrode
1-watertight cover; 2-terminal; 3-nut; 4-insulating gasket; 5-pressing nut; 6-sealing stuffing; 7-stuffing box; 8-stuffing box seat; 9 insulator; 10-watertight gasket; 11-electrode body; 12-stuffing; 13-hull; 14-cable; 15-cable stuffing box Figure 5 CCX-1 and CCX-2 zinc and zinc alloy reference electrodes GB/T 7387—1999
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1 cable; 2—sealing cover; 3-sealing filler; 4—electrode holder 5-sealing gasket; 6--nut; 7 sheath; 8—electrode body; 9-saturated copper sulfate solution; 10—sealing gasket; 11-pressing cover; 12—sealing gasket 13—semipermeable membrane Figure 6 CCT type copper/saturated copper sulfate reference electrode 3.4 Marking example
The electrode body material is silver/silver chloride, cylindrical, fixed reference electrode, and its marking is: Reference electrode CCY-1 GB/T7387—1999
4 Requirements
4.1 Materials
The electrode body materials of the reference electrode are shown in Table 2.
Table 2 Electrode body materials
Reference electrode name
Silver/silver chloride reference electrode
High purity zinc reference electrode
Zinc aluminum silicon reference electrode
Copper/saturated copper sulfate reference electrode
4.2 Chemical composition of zinc-aluminum-silicon reference electrode
The chemical composition of zinc-aluminum-silicon reference electrode is shown in Table 3. Material name
Silver nitrate
Silver chloride
High purity zinc
Aluminum-silicon alloy
Pure copper ladder
Copper sulfate
Table 3 Chemical composition of zinc-aluminum-silicon reference electrode
Element content
4.3 Electrochemical properties
0.10~0.16
Material brand specification
≥99.95%, 250~300 mesh
Analytical pure
Analytical pure
Ag-2(GB4135)
Analytically pure
≥99.999%
Zn99.99(GB/T470)
A199.70(GB/T1196)
ZL102(GB/T1173)
T2Y$5~6mm
(GB/T4423,GB/T5231)
Analytically pure
Impurity content
GB/T7387—1999
The electrode potential, potential stability and allowable polarization value of the reference electrode are shown in Table 4. Table 4 Electrochemical properties of reference electrode
Electrode potential (relative to saturated calomel electrode) Reference electrode type
Silver/silver chloride reference electrode
Zinc and zinc alloy reference electrode
Copper/saturated copper sulfate reference electrode
+0.001 5~+0. 009 5
1.044~—1.014
+0.069~+0.074
Potential stability
Polarization value
Cathode polarization current
10 μA
Anodic polarization current
10 μA
4.4 Structure
4.4.1 The reference electrode is to be insulated from the hull. The reference electrode body is to be fixed in an insulating seat made of insulating material, sealed with a stuffing box and equipped with a watertight cover.
4.4.2 The structural dimensions of the reference electrode cable stuffing box shall comply with the relevant provisions of CB/T3667.1. 4.5 Insulation performance
In a dry state, the insulation resistance between the electrode body and the terminal and the electrode watertight cover or stuffing box shall be greater than 1MQ. 4.6 Watertightness
The reference electrode structure shall not have any water seepage under a water pressure of 196kPa for 15 minutes. 4.7 Surface quality
4.7.1 After the reference electrode is assembled, the fastening parts should not be loose. 4.7.2 The appearance surface must be clean and free of any contamination or other undesirable phenomena. 5 Test method
5.1 Surface quality
The surface quality of the reference electrode shall be visually inspected, and the results shall comply with the requirements of 4.7. 5.2 Electrode potential measurement and potential stability test The test shall be carried out in accordance with the provisions of Appendix A (suggested appendix), and the results shall comply with the requirements of Table 4. 5.3 Insulation performance
After the reference electrode is assembled, use a 500V megohmmeter to measure the insulation resistance between the electrode body and the terminal and the metal bodies such as the watertight cover and stuffing box. The result should meet the requirements of 4.5. 5.4 Watertightness
The test should be carried out in accordance with the provisions of Appendix C (suggestive appendix), and the result should meet the requirements of 4.6. 5.5 Polarization value
The test should be carried out in accordance with the provisions of Appendix B (suggestive appendix), and the result should meet the requirements of Table 4. 5.6 Chemical composition analysis of reference electrode body
The silicon, iron and copper contents of the zinc-aluminum-silicon reference electrode shall be chemically analyzed in accordance with the provisions of GB/T4951, and the aluminum content shall be chemically analyzed in accordance with the provisions of GB/T12689.1. The results shall meet the requirements of Table 2. 6 Inspection rules
6.1 Inspection classification
The reference electrode inspection is divided into type inspection and factory inspection. 6.2 Type inspection
6.2.1 When the reference electrode is produced according to this standard, a type inspection shall be carried out in any of the following cases: a) when the design of a new product is finalized;
b) when the product is transferred to another factory for production;
GB/T7387-1999
c) when the factory inspection result is significantly different from the last type inspection; d) when the national quality supervision agency proposes a requirement for type inspection. 6.2.2 Type inspection items are shown in Table 5.
Table 5 Type inspection items
Inspection items
Electrode potential
Potential stability
Polarization value
Electrode body chemical composition analysis
Surface quality
Insulation performance
Water tightness
Table 2, Table 3bzxz.net
Test method
Type test
Factory inspection
A batch of products should be products provided once or produced in the same cycle, and these products are manufactured in batches or produced under basically the same conditions.
6.2.4 Random sampling of 10% (at least three) of the production volume of each batch of products shall be carried out for inspection. 6.2.5 If one indicator does not meet the requirements in the type inspection, double sampling shall be carried out for inspection. If there are still indicators that do not meet the requirements, it shall be judged as unqualified in the type inspection.
6.3 Factory inspection
6.3.1 Each batch of products shall be subject to quality inspection and a certificate of conformity shall be provided before leaving the factory. 6.3.2 The items for factory inspection are shown in Table 5.
6.3.3 The number of samples for factory inspection is the same as that in 6.2.4. 6.3.4 If one index does not meet the requirements during factory inspection, double sampling shall be conducted for inspection. If there are still indexes that do not meet the requirements, the batch of products shall be deemed unqualified.
Marking, packaging, transportation and storage
7.1 Marking
The reference electrode shall have a marking plate, which shall indicate the product name, model, specification, production date and number. The marking plate shall not be pasted on the electrode body.
7.2 Packaging
7.2.1 After the reference electrode has passed the inspection according to the inspection items of this standard, a certificate of conformity with the inspector code shall be attached, and it shall be packaged in a dark plastic bag together with the product manual and relevant accessories. 7.2.2 The reference electrode should be packed in wooden boxes.
7.2.3 The markings on the box should comply with the provisions of GB191. The text on the box should be neat, clear and correct, including the following: a) The name of the destination station or port and the consignee; b) The name and model of the goods;
c) Net weight, gross weight and volume;
d) The full name of the shipping unit;
e) The year, month and day of packaging.
7.3 Transportation
During transportation, attention should be paid to moisture prevention to avoid damage and contamination of the electrode. 7.4 Storage
The product should be stored in a dry, well-ventilated warehouse without corrosive gases. Silver/silver chloride electrodes must be kept away from light. A1 Sample preparation
A1.1 Sample size
GB/T7387-1999
Appendix A
(Suggested Appendix)
Test method for electrode potential measurement and potential stability of reference electrodea) See Figure A1 for the sample size of silver/silver chloride reference electrode by powder pressing method. b) See Figure A2 and Figure A3 for the sample size of silver/silver chloride reference electrode by hot dip coating method. c) See Figure A4 for the sample size of high purity zinc and zinc-aluminum-silicon alloy reference electrode.6
Figure A1 Dimensions of cylindrical silver/silver chloride electrode body by powder pressing method W
Dimensions of silver/silver chloride electrode body by hot dip coating method
Dimensions of mesh silver/silver chloride electrode body by hot dip coating method 150
Dimensions of zinc reference electrode body
A1.2 Number of samples
The number of samples is 5.
A1.3 Sample pretreatment
GB/T7387—1999
a) For the silver/silver chloride reference electrode sample of the powder pressing method, polish it with No. 500 metallographic sandpaper, rinse it with distilled water, and then immerse it in 0.1mol/L hydrochloric acid solution for activation for 6 days. After rinsing the activated electrode sample with the test medium, the test can be carried out. b) For the silver/silver chloride reference electrode sample of the hot dip coating method, immerse it in 3.5% sodium chloride solution for 48 hours before the test. c) For the zinc-aluminum-silicon reference electrode sample, polish it with No. 500 metallographic sandpaper (or polish it), wash off the oil with acetone, immerse it in 0.5mol/L hydrochloric acid solution to remove the surface oxide, then rinse it with distilled water, dehydrate it with alcohol, and then the test can be carried out. A2 Test conditions
a) Test medium: 3.5% sodium chloride solution (analytical grade). b) Medium temperature: 25℃±0.5℃.
c) Stability test time: 30 days for silver/silver fluoride reference electrode; 45 days for high purity zinc and zinc aluminum silicon reference electrode. A3 Test device
The electrode potential measurement and potential stability test device of the reference electrode are shown in Figure A5. 2
1--Temperature controller; 2-Spillometer; 3-Test electrode; 4-Salt bridge; 5-Saturated calomel electrode; 6-Electromagnetic stirrer; 7-Digital voltmeter (input impedance greater than 1 mA, accuracy less than 0.1 mV); 8-Saturated potassium chloride salt pool; 9-Electrolytic cell: 10-Constant temperature plant; 11-Electronic relay Schematic diagram of electrode potential measurement and potential stability test device Figure A5
A4 Test steps
A4.1 Electrode potential measurement
a) Put the treated silver/silver chloride reference electrode sample into the electrolytic cell, soak for 24 hours, and measure its electrode potential value with a saturated calomel electrode.
b) Place the treated high-purity zinc and zinc-aluminum-silicon reference electrode samples in the electrolytic cell, soak for 240 hours, and measure their electrode potential using a saturated calomel electrode.
A4.2 Stability test
a) Place the treated silver/silver chloride reference electrode samples in the electrolytic cell, soak for 24 hours, and measure their electrode potential using a saturated calomel electrode.
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