This standard specifies the sample preparation, instruments and reagents, test procedures, result calculation, retest rules and test reports for the acid resistance test of ceramic pipes. This standard is applicable to the acid resistance test of glazed or unglazed ceramic pipes. The quality of acid resistance is expressed by acid resistance. GB/T 2835-1998 Test method for acid resistance of ceramic pipes GB/T2835-1998 standard download decompression password: www.bzxz.net

GB/T2835—1998
This standard is equivalent to the "F3 acid resistance test" in Appendix F "Water absorption and acid resistance test of special chemical corrosion resistant pipes and accessories" of British standard BS65--1991 "Sintered ceramic pipes, accessories and joints", and partially retains the useful content of the original standard GB/T2835-1981 according to actual conditions.
This standard has made the following modifications to GB/T2835--1981 in terms of technical content: Article 5.1 stipulates the range of sampling quantity. This standard will replace GB/T2835-1981 from the date of its release and implementation. This standard is proposed by the State Administration of Building Materials Industry. This standard is under the jurisdiction of the National Industrial Ceramics Standardization Technical Committee. This standard is drafted by Shandong Industrial Ceramics Research and Design Institute of the State Administration of Building Materials Industry. The main drafters of this standard are: Li Dongsheng, Yuan Zhenqi, Lu Fenghua, Wang Xian. This standard is entrusted to Shandong Industrial Ceramics Research and Design Institute of the State Administration of Building Materials Industry for interpretation. This standard was first issued in 1981.
1 Scope
National Standard of the People's Republic of China
Test method for acid resistance of vitrified clay pipe
Test method for acid resistance of vitrified clay pipeGB/T 28351998
Replaces GB/T2835-1981
This standard specifies the sample preparation, instruments and reagents, test procedures, result calculation, re-test rules and test reports for the acid resistance test of vitrified clay pipe.
This standard is applicable to the acid resistance test of glazed or unglazed vitrified clay pipes. The quality of acid resistance is expressed by acid resistance. 2 Definitions
This standard adopts the following definitions.
The acid resistance of vitrified clay pipe refers to the ratio of the residual mass of a certain vitrified clay pipe particle sample after boiling in (1+1) hydrochloric acid solution for 1 hour to the original mass, expressed as a percentage.
3 Sample preparation
Take at least two samples with a mass of about 20 grams from each broken tube after the external pressure strength test, break them all, put them into a porcelain mortar and pound them while screening until they all pass through a standard sieve with a mesh diameter of 1.0 mm. Take the particles between the sieves with mesh diameters of 0.8 and 1.0 mm, reduce them to about 10g by quartering, rinse them with distilled water, dry them at 110°C ± 5°C, and store them in a desiccator for later use. 4 Instruments and reagents
4.1 Test equipment
4.1.1 Analytical balance: sensitivity 0.0001g; 4.1.2 Explosion box: use temperature above 150℃, with automatic constant temperature control function, accuracy of ±5℃; 4.1.3 Adjustable temperature plate electric furnace,
Conical flask: 300mL;
Dryer with color-changing silica gel; wwW.bzxz.Net
4.1.6 Muffle high-temperature electric furnace: maximum use temperature above 1000℃; 4.1.7
Porcelain crucible;
4.1.8 Glass funnel and funnel stand;
4.1.9 Reflux condenser: serpentine or spherical, 500mm long. 4.2 Test device
The test device is shown in Figure 1.
Approved by the State Administration of Quality and Technical Supervision on October 12, 1998 12
Implemented on April 1, 1999
4.3 Reagents
GB/T2835—1998
1 Water outlet; 2—Iron stand; 3—Water inlet; 4—Conical flask; 5—Electric furnace; 6—Voltage regulator Figure 1 Test device diagram
4.3.1 Hydrochloric acid solution: (1+1) hydrochloric acid solution. The hydrochloric acid used to prepare the hydrochloric acid solution is concentrated hydrochloric acid. 4.3.2 Methyl red indicator: 0.1%.
All reagents used are chemically pure reagents.
5 Test steps
5.1 Weigh 1.0000~1.2000g of dry sample and put it into a conical flask. 5.2 Add 25mL ± 0.5mL of hydrochloric acid solution to the conical flask, install a reflux condenser, heat to boiling with an electric furnace equipped with an adjustable temperature, keep it in a slightly boiling state for 1 hour, and then turn off the electric furnace to stop heating. Note: When it is slightly boiling, continuous bubbles should appear on the liquid surface, and the sample should be slightly turned over in the solution. 5.3 Slowly inject 100mL of distilled water from the upper end of the condenser, remove the condenser, and rinse the lower end of the condenser and the bottle stopper with a small amount of distilled water, so that this washing water flows into the conical flask.
5.4 Let the conical flask stand for 10 to 15 minutes, pour out the upper clear liquid in the bottle, add 50mL of distilled water, transfer the solution and sample in the bottle to a glass funnel covered with rapid quantitative filter paper for filtration, and rinse the sample with hot distilled water until the filtrate is neutral. 5.5 Remove the filter paper with the sample from the funnel and place it in a crucible that has been weighed constantly. Ash and burn it in a muffle furnace at 700℃ until it reaches constant weight. Move the crucible to a dryer, cool it to room temperature, and then weigh it. 5.6 Weigh the residual mass of the sample after corrosion to an accuracy of 0.0001g. 6 Result calculation
The acid resistance of the sample is calculated according to the following formula, and the result is retained to 3 significant figures: RA
Where: RA——sample acid resistance, %;
Original mass of the sample, name;
m——residual mass of the sample after corrosion·g. 7 Re-test rules
The same sample should be tested in parallel. If the difference between the two results is not greater than 0.4%, their average value shall be used as the final test result of acid resistance. If it exceeds, two more samples should be taken from the same sample for re-testing, and the average value of the results of the two re-tested samples shall be used as the final test result.
8 Test Report
The test report should include the following contents:
a) name and number of the sample,
b) number according to the standard;
GB/T2835-
—1998
c) original mass of the sample and residual mass of the sample after corrosion; d) acid resistance result and average value of each sample; e) test date and tester.
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