Preparation of steel substrates before application of paints and related products--Test methods for non-metallic blast-cleaning abrasives
Some standard content:
ICS 87.020
National Standard of the People's Republic of China
GB/T 178491999
eqv IS0 11127:1993
Surface preparation of steel substrates before application of paints and related products -Test methods for non-metallic blast-cleaning abrasivesPublished on August 31, 1999
Implemented on June 1, 2000
Published after the National Technical Supervision
GB/T 17849 -1999
This standard is compiled based on 1S011127:1993 "Test methods for non-metallic abrasives for blasting of steel surfaces before coating". The technical content is equivalent to that of the international standard and the writing format has been modified. 1S011127 Test methods for non-metallic abrasives for blasting of steel surfaces before coating contains eight parts: Part 1: Sample preparation
Part 2: Determination of particle size distribution
Part 3: Determination of apparent density
Part 4: Evaluation of hardness by glass slide test Part 5: Determination of water content
Part 6: Determination of water-soluble impurities by measuring the electrochemical conductivity Part 7: Determination of hygroscopic compounds
Part 8: Determination of mechanical properties of latex Each of the eight parts is defined as an independent standard. At present, Part 8 is still under development. Considering that these test methods are relatively simple, this standard compiles the previous seven non-metallic abrasive test methods into one standard. This standard is compiled in the following format: 1. Part 1 to Part 7 of IS011.127 are compiled as Chapter 5 to Chapter 11 of this standard respectively, and the "scope", "reference standards", "reagents and packaging" and "test report" of Part 1 to Part 7 are combined together to become Chapter 1, Chapter 2, Chapter 4 and Chapter 12 of this standard. The "definition" of Part 1 of IS011.127 is compiled as Chapter 3 of this standard. Chapter 10 of this standard is "Determination of electrical conductivity of submerged liquid". The difference from Part 6 of IS011.127 is: direct determination of conductivity using a conductivity meter. Appendix A of this standard is the appendix for reminder. This standard was proposed by China Shipbuilding Industry Corporation. This standard belongs to the first research institute of China Shipbuilding Industry Corporation. The author of this standard is: China Shipbuilding Industry Corporation 11th Research Institute. The main editor of this standard is: Qin Yinhua.
GB/T 17849-1999
ISO Foreword
ISO (International Organization for Standardization) is a global joint organization of national standards bodies (ISO member organizations). The formulation of international standards is usually carried out by ISO technical committees. Each member organization has the right to participate in the work of a technical committee if it is interested in the subject of a technical committee. International organizations or non-international organizations related to ISO may also participate in this work. ISO International Standard Committee IEC closely cooperates with all aspects of electrotechnical standardization. The international standards drafted by the technical committees are sent to the member groups for voting. At least 75% of the member groups participating in the voting must vote before it can be published as an international standard. 5/SC.12 Developed by Technical Committee SC 12 on Surface preparation of steel substrates before painting.
IS011127, under the general title "Test methods for non-metallic materials for blast cleaning of steel substrates", consists of the following substandards:
Part 1: Sampling
Part 2: Determination of particle size distribution
Part 3: Determination of density
Part 4: Evaluation of visual acuity by glass slide test
Part 5: Determination of water content
Part 6: Determination of water-soluble impurities by electrical conductivity
Part 7: Determination of water-soluble chlorides
Part 8: Determination of mechanical properties of steel substrates
Part 8 is under preparation.
Appendix A Supplementary Appendix.
1 Scope
National Standard of the People's Republic of China
Surface treatment of steel substrates before application of paints and related products-Test methods for non-metallic blast-tearing ahrasives GB/T 17649-1999
24 $0 11127:1993
This standard specifies the test methods for non-metallic blast-tearing ahrasives used for loosening and cleaning of steel substrates before application of paints and related products, as well as the test methods for particle size, particle size distribution, hardness, air quality, water dropout, and water-based chloride. This standard is applicable to the test of non-metallic substrates for blast-tearing before application of paints. 2 Referenced standards
The provisions contained in the listed standards shall be used as the main text of this standard through the use of the reference in this standard. At the time of publication of this standard, the editions shown are valid. All references to this standard are subject to change. Parties to this standard should refer to the most current edition of the following standard: (B/T 6005-1997 Test Methods for Wire Mesh, Perforated Plate and Electrode Plate Screens - Dimensions (EQY 150 565:1990)
G3/6682:1992 Specification and Test Method for Water for Testing of Density (NE91) 3696:[982) 3 Definitions
This standard adopts the following definitions.
3. Total quantity
The total number of samples to be tested (e.g. the number of batches), i.e. the number of samples provided for sampling. 3.2 -- Bingle sampks
Samples obtained by sampling from the total number. These samples are not directly used for testing. 3.3
mixed sample
sample obtained by combining two samples.
3.subtracted sample
sample obtained by subtracting two samples. Note: when the appropriate number of samples is reached, all subsamples after each subtraction shall be discarded except one. If necessary, the samples with different dimensions may be re-analyzed:
3.5 sample wt sample
sample subtraction sample, which has sufficient data and information for the test, can be directly used for each test. 3.6 Apparent density apparentdensity The density of a given volume of non-abrasive materials measured by the pycnometer method specified in this standard. Approved by the State Administration of Quality and Technical Supervision in 1999-0B-31 and implemented on June 1, 2000. 4 Reagents and apparatus CB/T 17849-1999 4.1 Distilled water: purity not less than Grade 3 specified in GB6682. 4.2 Conductive water: purity not less than Grade 2 specified in GB6682. 4.3 Sulfuric acid: concentrated sulfuric acid. Concentration is about 96% (by volume), density is about 1.84 g/ml. 4.4 Silver nitrate: standard titration solution. Concentration (AgN()) is 0.01 mol/L. 4.5 Sampler: Made of seamless steel pipe with an inner weight of about 25mm and a length of about 800mm, with a T-shaped handle on one end and a sharp edge on the other end. Holes are made along the length of the pipe. The holes should be continuous. The hole spacing is 50mm + the diameter of the hole, which is about 3 times the maximum particle size.
Note: For non-metallic materials, use 10 rm direct inspection support, 4.6 Sample divider, melting slot reducer or other equipment: should be suitable for reducing the sample 4. Test sieve, round, 2~~50mm high, the diameter of the metal wire mesh is about 100m, the frame of the test sieve is made of metal, the sieve hole diameter range is determined according to the specifications of the test product, and should meet the requirements of Table 2 and Table 3 in GB/T6005--199, the sieve hole is square hole + can be equipped with a sieve cover and a storage basin. The test sieve should be calibrated and inspected regularly: there should be no residual abrasive, 4.8 Rotary sieve machine: rotate the sieve with the sample at a speed of about 300z/min, and have a timer, the timing range is 0~30min. The timing interval is 1 min.
Note: Other sieve machines can be used as long as they can obtain the same results, 4.9 The accuracy of the large flat + is (.1 0.01 g of each. 4.10
Pycnometer: 50 ml cap, with capillary stopper, 4.11
Oven: (110 ± 5) constant temperature oven,
Desiccant. Filled with desiccant, such as desiccated silica gel filled with cobalt chloride. Microscope: with 10 times magnification.
Microscope glass slide
Ben or plate: heat-resistant, with sufficient volume to clamp the sample flat into a thin layer. Conductivity meter (1~100 mS/m)
Conductivity cell.
Current dripping device.
4.19Microburette.
5 Sampling
5.1 Sampling steps
5.1.1 Batch sampling
Sampling can be done manually or automatically according to the total number of abrasives and the state of the batch (packaged or unpackaged). The sampler should be used to sample the total number of batches as evenly as possible. The number of samples to be drawn shall be as specified in Table 1. 1 From the number of the first ten samples of the batch. 1 The number of samples to be drawn shall be as specified in Appendix A (Recommended) for each sample. 5.1.2 Preparation of mixed samples
According to 5.1, all the samples taken shall be mixed in a suitable container and the particles shall be distributed evenly to form a sample.
5.1.3 Sample quantity
GB/T 178491999
The mixed sample shall be subdivided mechanically, such as by using a slot subdivider, or manually. If otherwise specified or agreed, a subdivided sample shall be obtained after each subdivision, and the subdivision shall be repeated until an appropriate amount of sample is obtained (see Figure 1). "General"
Single group product
One sample
Sub-sample
Sub-sample
Sub-sample
Single-sample
Mixed samplebzxz.net
The first sub-sample
The second sub-component
The second sub-group
The third sub-group
The sixth sub-sample
Figure 1 Schematic diagram of sampling and sample subdivision
(Take five single samples as an example, and then divide them) 5.1.4 Validity of test sample based on Different test methods determine that the sample should be stored in a sealed container for use. Before the test, the sample should be mixed again. The used sample should not be mixed with the preserved sample.
5.2 Sample identification
Each sealed container for placing samples should have at least the following engravings: a) The contents used to identify the tested product. If the product is in the corresponding standard, the standard mark shall be used: b) Details of the batch identification, such as supplier, order, shipment date, receipt date; ) Any traceability information related to the sample, 6 Determination of particle size distribution
6. 1 Weigh out about 300 g of the sample, accurate to 0.1. 6.2 Arrange the test sieves from top to bottom according to the density level: the thinnest test sieve is placed on the top, the densest test sieve is placed on the bottom, and a plate is placed under the thinnest test sieve to receive the abrasive that passes through the sieve holes of the densest test sieve. 6.3 Place the sample on the top test sieve and cover it. 3
GB/T 17849—1999
6.4 Install the sieve rack for the test on the rotary sieve machine and run the rotary sieve machine for 15 minutes. 6.5 Carefully remove the top end from the rack and weigh the abrasive left on the sieve L into a balance pan, accurate to 0. g·Record the results for all sieves on rack 1, including the lowest one, and record the results separately. 6-6 Calculate the weight of the sample retained on the test sieve and the collection plate according to formula (1): 1c0
The weight of the sample retained on the test sieve or collection plate is the weight of the sample retained on the test sieve + the weight of the sample retained on the collection plate.
6.7 Test results: Perform parallel tests: If the difference between the two test results exceeds 10%, repeat the sedimentation tests in 6.1~6.6: Calculate the absolute value of the two valid test results to ensure that the average value is 1 cup: 7 Determination of apparent density
7.1 Place a sufficient number of salt samples at (ttu ± 5)℃ Heat in a constant temperature oven for 1 hour to dry it, then place it in a desiccator to cool to room temperature. 7.2 Weigh the clean, dry pycnometer, and then weigh the sample with a precision amplification. 7.3 Fill the pycnometer with water or deionized water until it is fully filled, install an impeller, and then gently move the pycnometer to remove air attached to the sample. Remove the impeller, fill it with water, and then install the stopper, which allows the excess water to be discharged through the capillary. Carefully wipe the outside of the pycnometer dry. Make sure there is no air present and then weigh the pycnometer and its contents. 7.4 Empty the pycnometer and rinse it several times to remove all residues of the abrasive, fill the bucket with distilled water or deionized water, and install the stopper to ensure that there are no bubbles. Wipe the outside of the pycnometer and weigh it. Care should be taken not to use the pycnometer to prevent it from being heated by hand. The pycnometer, test sample and water should be kept at approximately the same temperature. 7.5°C. (2) Calculate the apparent density of the test sample. M ma1
Ps- (mai-mal) - (ma m)
Apparent density of the pycnometer, kg/m
State---Phycnometer weight·8:
m---Weight of pycnometer, test sample and water·
m:---Weight of pycnometer and water·
P.-Density of water at the measured temperature, kg/m. 7.6 The test should be repeated. If the results of the two tests are more than 10% different, repeat the test according to 7.1 to 7.4 and calculate the average value of the results of the two tests. The results should be accurate to 10/m. B. Evaluate breakage by glass slide test
8.1 Examine the sample under a microscope. If the particles are of different colors and sizes, select a test piece for each type of particle. 8.2 Place the selected sample between two microscope glass slides. Apply pressure and slowly place one piece on the other slide for 10 seconds. Observe the surface of the slide. If there are scratches on the slide surface, the sample is considered to have a breakage of at least greater than 6 on the Mohs scale. 9 Determination of water content
9.1 Place the container in an oven and dry it at (10 = 3) for 15 min. Then place it in a desiccator and cool it to room temperature. Weigh the sample on a balance and weigh about 100 g of the sample to an accuracy of 0.01 g and place it in the container. Weigh the container to the nearest 0.01.
9.2 Place the container containing the sample in an oven pre-adjusted to (10 = 6) for at least 1 hour. Then move the container to a desiccator and cool it to the desired temperature. Weigh the container containing the dried sample to an accuracy of 3.01 g to determine the moisture content of the dried sample. 4
GB/T 17849--1999
9.3 Calculate the water content expressed in weight percentage according to formula (3). M = mm = 2 × 100
Formula: - Water content of the sample.%:
me—The weight of the sample before heating;
m3—The heating point +g.
-.....(3)
9.4 The test should be carried out in parallel. If the results of the two tests are more than (.061), the test should be repeated according to 5.1.9.2. The arithmetic mean of the two valid test results is calculated to an accuracy of 0.01. 10 Determination of the conductivity of the water extract
10.1 Weigh (1000.1)g of the sample into a 250tnl. volumetric flask, add 1+)ml of conductive water, release 5mi2, let it stand for 1, and then according to the conductivity of 5 nin, and then filter it to stabilize. If the concentrate is not completely clear, filter it by appropriate means. 10.2 Connect the conductivity meter and install the test instrument according to the instructions provided. 10.3 Measure the conductivity of the liquid with a conductivity meter. The conductivity meter must be compensated at 20°C, or the conductivity measurement must be carried out for 20 hours.
10.4 The test should be repeated in parallel. If the results of the two tests are more than 10% different, repeat the test in 10.1 to 10.3 and calculate the step average of the two valid test results. The result should be accurate to S/s. 71 Determination of Water-Soluble Compounds
11.1 Weigh (100.1) g of the sample into a 250 L container and add (1 ± 10) mE of water. Stir for 5 min. After 1, stir for 5 min. Then let it stabilize. If the sample liquid is not completely clear, filter it by appropriate means: 11.2 Take 25 mL of the solution, add 0.1 ml sulfuric acid and dilute with water to about 75 mL. 11.3 Use a micrometer to weigh the titrant in the titration tube until the solution is full and record the end point, which is the value when the pointer of the ammeter reverses. 11.4 Calculate the water-soluble chemical content of the sample according to formula (1) and express it as the percentage of base white. zucC1) = Y×D 000355 × 4× 100ne.e
Where: BtE)-water-soluble chemical content of the sample, %m4 weight of the sample.
..volume of the standard silver nitrate titration solution used, mL;.-+..-++t 4?
1,089355-the number of liters of the standard silver nitrate titration solution with a concentration of 0.HL mrl/T. converted into grams of CI. 11.5 The test should be carried out in parallel. If the difference between the test results exceeds 10%, repeat the test in accordance with 11.1~1].3. Calculate the arithmetic mean of the results of the two efficacy tests, and the result shall be accurate to 0.0001%. 12 Test report
The test report shall include the following contents:
The contents used to identify the product under test. If the product has a corresponding standard, the standard shall be used as the label: h) This standard (B/17849):
c) Test results:
d) Differences from the test methods specified in this standard: e) Test period:
) Tester.
A1 Scope
CB/T17849-1999
Appendix A
(Reminder)
Guidelines for sampling from stockpiles and transport units In some cases, combined sampling must be carried out, such as sampling from stockpiles and train carriages, barge holds or cargo holds. In the case of "situation", it is difficult to ensure that separation will not cause serious deviations in the sampling results. A2 Sampling from the stockpile
A2.1 When sampling from the stockpile, it is difficult to ensure that the sample is free of deviation. This is because when the material is piled up, separation often occurs. Coarse particles roll to the outer part of the material fiber. For the combination of particles or mixed coarse particles and fine particles, we should try to use power equipment to sample from different layers and parts of the stockpile to form several independent small sampling piles. Mix several samples taken from the small sampling piles to form the samples for test sampling. If it is necessary to show the degree of variability in the main stockpile, samples should be taken from various parts of the stockpile separately. A2.2 In the absence of power equipment, at least 1/3 of the volume of the main stockpile, the midpoint of the stockpile and the At least three portions are drawn from the bottom 1/3 of the pile to form the sample. Use a plate to push vertically into the pile above the sampling point to prevent further separation. When sampling from a pile of fine-grained materials, the outer layer that may have been separated should be removed and then the sample should be collected. A puller with a minimum inner diameter of 30mm and a minimum length of 2m can be used to randomly spread the material and draw at least five portions from the pile to form the sample. A3 Sampling from transport units
When throwing samples from a pile of coarse-grained materials in a train car or barge hold, dynamic equipment should be used as much as possible to expose materials at different locations. In the case of dynamic equipment, a common practice is to dig three or more trenches across the transport unit at several points that can represent the characteristics of the pile. The bottom of the trench should be approximately horizontal. The width and depth below the surface should not be less than 0. 3 m, push the shovel down into the pile at approximately the same point along each groove and take samples. The number of sample portions shall not be less than 100%. Sampling from coarse-grained piles in trucks is basically the same as that for sampling in train carriages and barge holds. The number of portions shall be adjusted according to the size of the truck. When sampling from piles of granular materials in transport bottles, appropriate portions may be taken with the sampler specified in A2 to form the sample.
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