HG/T 2377-1992 Determination of the corrosion resistance of glass-lined layer to boiling water HG/T2377-1992 standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG/T 2377—92
Determination of the Boiling Water Corrosion Resistance of Glass Layer
Published on September 15, 1992
Implementation on July 1, 1993
Chemical Industry Standard of the People's Republic of China
Determination of the Boiling Water Corrosion Resistance of Glass Layer
1 Subject content and scope of application
This standard specifies the test method and result calculation for the boiling water corrosion resistance of glass layer. This standard is applicable to the determination of the boiling water or water vapor corrosion resistance of glass flat specimens. 2 Reference standards
GB7989 Determination of resistance of glass glaze to boiling hydrochloric acid corrosion GB7992 Preparation of steel plate glass specimens
3 Principle
HG/T 2377-92
The glass specimen is subjected to boiling water or water vapor corrosion for 48 hours, the weight loss is measured, and then the corrosion rate is calculated. According to the dew, the specimen can be corroded by only one phase
The lower the corrosion rate, the better the corrosion resistance of the glass to water 4 Reagents
4.1 Distilled water or softened water (freshly prepared water should be used for each test), 4.25% acetic acid solution: used to clean the test device and specimens, 4.3 Solvents: such as trichloroethylene or acetone, used to degrease the specimens. 5 Instruments
5.1 Analytical balance: accuracy is ±0.2mg. 5.2 Hair dryer,
5.3 Oven.
5.4 Dryer
5.5 Volume: 500 mL.
Foamed plastic or sponge
6 Test apparatus
The test apparatus is the same as the test apparatus in Chapter 4 of GB 7989.7 Test specimens
7.1 The test specimens are circular and shall be prepared in accordance with GB7992.7.2 Each set of test specimens consists of two test specimens, one of which is placed in the liquid phase and the other in the gas phase (if otherwise agreed, only one of the phases may be used). Approved by the Ministry of Chemical Industry of the People's Republic of China on September 15, 1992 and implemented on July 1, 1993.7.3 Each measurement shall be conducted with at least two sets of test specimens
8 Test procedures
HG / T 2377 -- 92
8.1、Selection of test pieces: Select the prepared test pieces, and remove the test pieces with defects such as uneven surface and cracked porcelain. Select the test pieces suitable for the corrosion resistance test by weighing method. 8.2 Cleaning and weighing of test pieces: The selected test pieces can be degreased with solvent (4.3), then rinsed with distilled water, blown dry with a hair dryer (5.2), and dried in an oven (5.3) at 110±5℃ for 2h, then moved to a dryer (5.4) and placed for more than 4h, and then weighed accurately to 0.2mg, as the starting mass m, (g). 8.3 Fix the sample in the test device so that the side of the sample coated with glass glaze faces the inside of the glass tube. 8.4 Put 350mL of distillation (4.1) into the glass tube from the interface of the condenser, install the thermometer and condenser, pass water, connect the electric heating coil power supply, adjust the voltage, and make the solvent carboxylic acid in 10~20min. The test solution starts to boil. As soon as it reaches boiling, record the time as the test start time, and immediately adjust the heater voltage to reduce the current so that the test solution remains in a slightly boiling state during the entire test process. Record the temperature during the slightly boiling period and maintain the slightly boiling time at 8.5° for 48 hours.
8.6 After 48 hours of testing, terminate the test, pour out the water in the glass tube, rinse it with distilled water after cooling, disassemble the test device and take out the test piece, scrub the corrosion surface three times with a sponge and cold 5% acetic acid, rinse it with water, then wash it with distilled water, and finally degrease it with a solvent, dry it in an oven at 110±5°C for 2 hours, then move it to a desiccator and cool it for more than 4 hours, and finally weigh it (accurate to 0.2 mg) as the final mass m, (g)
9 The result showswww.bzxz.net
Corrosion rate V [g / (m2·d))
Where: m=m,-m2,
Weight loss Am(g)
Area(m)×time(d)
9.1 The area corroded by water or water vapor in the test is 50cm. If the weight loss Am is expressed in milligrams, after 48 hours, its corrosion rate V is calculated according to formula (2) and expressed in grams of weight loss per square meter per day: Yk
9.2 Calculate the results obtained from the test of the liquid phase and the gas phase placed in the test device respectively. Because the determination includes two sets of parallel tests, two liquid phase corrosion values ​​and two gas phase corrosion values ​​are obtained. They are averaged to obtain the semi-average corrosion rate V of liquid phase corrosion and the average corrosion rate Vc of gas phase corrosion. The range of gas sample corrosion rate and liquid phase corrosion rate RG and RLR-Vma are calculated respectively. If Rn (or Rr) ≤ 0. 15g/(m2, d) or Rc/Vg [or Ri/V,) × 100% ≤ 30%, the data is valid, otherwise the test is repeated and the results are recalculated. When evaluating the results, for defects in the sample, such as pinholes that pass through the metal substrate, edge cracking or edge corrosion, these results should be discarded, and the corresponding number of new specimens should be used for testing, and the data should be merged. 10 Test report
The test report should include the following:
b. Heating time, in days:
HG / T 2377-92
The value of the extreme difference or relative deviation R/V×100% of the average corrosion rate Vo of the gas phase and the average corrosion rate VL of the liquid phase, d.
The corrosion rate is expressed as the weight loss per square meter per day (g/m2·d), rounded to 0.01g (m2·d). If there is no special agreement, the arithmetic mean and each individual value are given according to the gas phase and liquid phase respectively, and the data of the phase with the larger corrosion rate is used as the corrosion resistance data of the pond glass layer.
Additional remarks:
This standard was proposed by China Chemical Equipment Corporation, Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Pond Glass Equipment. This standard is drafted by the Chemical Machinery Research Institute of the Ministry of Chemical Industry. The main drafter of this standard is Xiang Longwen
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Chemical Industry Standard
Determination of the boiling water corrosion resistance of sugar glass layer HG/T 2377 92
Editor: Chemical Industry Standard Editorial Department
(Chemical Industry Standardization Research Institute)
Postal Code: 100013
Printer: Chemical Industry Standardization Research Institute
Copyright: No duplicate printing
Format: 880 × 1230 1 / 16
Number of words: 5000
First edition: June 1993
First printing: June 1993
Print run: 1-500
Cost: RMB 1.20
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