This standard is applicable to the evaluation of the antifouling performance of antifouling paint for steel ships and offshore engineering structures when immersed in shallow water. GB 5370-1985 Shallow sea immersion test method for antifouling paint samples GB5370-1985 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Method for testing antifouling panels in shallow submergence
UDC 667.637.4
1629.12.011.7
GB 5370—85
This standard applies to the evaluation of the antifouling performance of antifouling paint for steel ships and offshore engineering structures when immersed in shallow sea. 1 Definition
1.1 Shallow sea immersion test of antifouling paint panels
It is a test method to immerse the panels coated with antifouling paint in shallow sea, observe the species, amount and reproduction degree of marine fouling organisms on the panels on a monthly basis, and compare with blank panels and control panels, and evaluate the antifouling performance of antifouling paint based on the observed results. 1.2 Antifouling performance
The ability to prevent the attachment and reproduction of marine fouling organisms. 1.3 Edge influence
Since the edges of the sample are easily damaged and the paint film is thin, the damage to the paint film or the premature attachment of marine fouling organisms will have an impact on the result evaluation.
2 Devices
2.1 Floating fencing
2.1.1 The immersion test can be carried out on floating fencing with structures such as steel, wood, reinforced concrete, etc. where seawater flows. 2.1.2 The berthing location of floating fencing should be in the sea area where marine organisms grow vigorously in the bay and the seawater tide is less than 2m/s. It should not be placed in the estuary or in the sea area with serious industrial sewage pollution.
2.2 Frame wwW.bzxz.Net
The frame material can be angle steel less than 25mm×25mm×3mm. The angle steel is welded into a three-stage frame, as shown in Figure 1. After the surface of the angle steel is rust-proofed, it should be painted with anti-rust paint and anti-fouling paint. Figure 1 Schematic diagram of frame and sample fixing
1-sample, 2-insulated wire, 3-frame
National Bureau of Standards 1985-0911 Issued
1986-06-01 Implementation
Preparation of sample
GB 5370-85
3.1 Blank sample
The blank sample adopts 4-6mm thick dark hard polyvinyl chloride plate, and its surface should be roughened with No. 3 diamond sandpaper. a.
The size of the blank sample should be the same as that of the test sample. b.
3.2 Control sample
The paint used for the control sample must be the matching anti-rust paint and anti-fouling paint that has been technically identified or confirmed by the ministerial level. The recommended matching a.
anti-rust paint and anti-fouling paint are listed in Appendix A (reference). The base material, surface treatment and size of the control sample shall comply with the provisions of 3.3a and 3.3b. b.
The coating process of the coating used in the control sample shall comply with the technical requirements of the product. Test sample
The base material of the test sample shall be a 3mm thick low-carbon steel plate. The length of the sample shall be greater than or equal to 300mm, and the width shall be greater than or equal to a.
150mm. The drilling position is shown in Figure 2.
The size of the sample in Figure 2
The base material surface of the sample shall be sandblasted or shot blasted to remove the rust and oxide layer on the surface of the steel plate. After the surface treatment of the steel plate, it shall meet the requirements of Class b in CB*3092-81 "Rust Removal Standard for Ship Hulls". The sand and dust on the surface of the steel plate is fixed to the frame with an insulated wire, as shown in Figure 1.
The coating process of the coating used in the test sample shall comply with the technical requirements of the coating. 3.4 Number of samples
Three blank samples, control samples and test samples should be prepared, and each sample should be fixed on the same frame (upper, middle and lower levels). 3.5 Safety measures
When preparing samples, labor protection equipment should be worn in accordance with relevant regulations, and waste materials must be handled in accordance with the National Environmental Protection Law and relevant local regulations. 4 Immersion in the sea
4.1 The immersion test of antifouling paint samples should start at least one month before the peak season of marine life in the sea area where the test is located. 4.2 The samples should be marked before immersion in the sea, the original state should be recorded, and the surface of the samples should be photographed. 4.3 The test samples, blank samples and control samples must be immersed in the sea at the same time. The immersion depth of the samples is between 0.2 and 2m. 4.4 The immersed samples should be fixed vertically and firmly on the frame, and should not contact the frame or other metals. The surface of the samples should be parallel to the main current of the seawater.
4.5 The spacing between the frames should be greater than or equal to 200mm. 5 Observation and Records
5.1 Observation
After the sample is immersed in the sea, it should be observed once a month and the sample surface should be photographed every quarter. a.
GB 5370-85
During observation, the sea mud attached to the sample should be carefully removed, but the paint film surface should not be damaged. b.
During observation, 20mm along the edge of the sample should be removed to eliminate the edge effect. c.
Test results.
The observation time should be shortened as much as possible. After observation, the sample should be immersed in the sea immediately to avoid the death of attached organisms and affect the test. 5.2 Records
a. Record the number of marine fouling organisms attached to the sample and their growth conditions. b. Record the surface conditions of the paint film on the sample, such as rust, cracks, blistering, peeling, powdering, etc. c. The record should also include the sample number, size, paint and its supporting system, paint manufacturer, immersion location and time, observation time, photo date and photo number, etc. 6 Result evaluation
6.1 When the surface biofouling of the blank sample is serious and the surface biofouling of the control sample is significantly lower than that of the blank sample, the test result is valid, otherwise the test result is invalid.
6.2 The main species of marine fouling organisms are barnacles, moss worms, mollusks, water, sea squirts, brown algae, green algae, and polychaetes. The antifouling performance of the antifouling paint is evaluated according to the number and coverage area of ​​their attachment. 6.3 Compare the observation results of the test sample with the control sample every quarter to evaluate the antifouling performance of the test sample. 6.4 At the end of the immersion test, the observation results of the test sample should be compared with the control sample, and the surface of the sample should be photographed to evaluate the antifouling performance of the test sample.
6.5 Calculation and evaluation of test results
6.5.1 Use a percentage grid plate with the same observation area as the sample to measure the coverage area of ​​fouling organisms on the test sample and the control sample respectively. 6.5.2 When evaluating the results of the test sample or control sample in the same frame, if the difference in the fouling organism coverage area is less than 5%, the average value shall be taken. Otherwise, the average value of the two samples with larger fouling organism coverage area shall be taken to calculate the test nesting and evaluate the antifouling effect of the antifouling paint. 6.5.3 Test results
When the fouling organism coverage area of ​​the test sample is less than 1-5% of the control sample, it is slightly better, less than 5-10% is good, and equal is the same; more than 1-5% is slightly worse, and more than 5-10% is bad. 6.5.4 When the fouling organism coverage area of ​​the test sample is greater than 10%, the test shall be terminated and taken as the final test result. 272 | |tt | -29
GB 5370-85
Appendix A
Coating matching system for comparison sample
(reference)
Aluminum powder primer
Black brown antirust paint for ship bottom
Brown antifouling paint
Aluminum powder chlorinated rubber antirust paint
Iron red ammoniated rubber antirust paint
Cuprous oxide ethylene copolymer antifouling paint
Cuprous oxide acrylic antifouling paint
Epoxy asphalt antirust paint
Chlorinated rubber antirust paint
Epoxy ester antifouling paint
Aluminum powder primer
Asphalt antirust paint Paint
Antifouling paint
Antifouling period
Short-term period (two years)
Medium-term period (three years)
Medium-term period (three years)
Long-term period (five years)
Kailin Paint Factory
Shanghai Paint Institute
Kailin Paint Factory
Guangzhou Paint Factory
Guangzhou Paint Institute
Qingdao Paint Factory
Marine Paint Institute of the Ministry of Chemical Industry
Additional remarks:
This standard was proposed by China State Shipbuilding Corporation and is under the jurisdiction of the National Technical Committee for Standardization of Paints and Pigments. This standard was drafted by Yang Ship Material Research Institute of China State Shipbuilding Corporation. The main drafters of this standard are Ma Zhizhong and Jin Xiaohong. 273
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