GB 4738.2-1984 Test method for acid and alkali resistance of daily-use ceramic materials (particle method) GB4738.2-1984 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test method for acid and alkali resistance of daily-use ceramic materials (particle method)
Standard test method for acld, atkaline resistanceEor ceramic materiais of dally use(particulate test methot)
This standard applies to daily-use ceramic products with a water absorption rate of less than 5% under glaze or glaze. Definition
UDC 666.3):620
.193.4
GB 4T38.2—B4
H-type ceramic insulation (alkali) resistance refers to the resistance of daily-use ceramic materials to acid (alkali) corrosion. Its acid (alkali) resistance is expressed by acidity.
This standard adopts a sample with a particle size of 0.91.6 μm, and is slightly boiled in a corrosive medium of concentrated sulfuric acid and 10% sodium hydroxide for 1 hour. The ratio of the weight of the sample that is mostly addicted to the weight of the original sample is H (acid and alkali resistance of porcelain materials). 2 Equipment and tools
2.1 Analytical kcal: 1/10000g.
2.2 Electric heating drying box,
2.3 Moisturizable disc-shaped electric furnace, maximum power 800W. 2. Yuan angle burning: 350ml
2.$ Serpentine reflux condenser: 3m0~500mm long 2.6# condenser: maximum temperature 1000℃.
2.7 Sample distribution range: hole diameter is 0.9mm and 1.6mm. 2.B Lower dryer with color-changing silica gel.
2.9 Long-necked glass bucket.
Porcelain city: 25ml
Porcelain bowl and plastic washing bottle.
Black and white test plates
Fast quantitative filter paper: 12.5cm.
National Bureau of Standards 1984-11-02 Issued
1985-08-07 Implementation
a Reagent
GB4738.2-84
Reflux condenser
3.1 Sulfuric acid (GB625-77).
8.2 Sodium hydroxide (GB629-77): 10% solution (prepared according to GB603-77 "Preparation of chemical reagents and products"). 8.3 Methyl orange (IJGB3089-59): 0.1% indicator solution (prepared according to GB603-77). 8.4 Phenolic acid (HGB3039-59): 1% indicator solution (prepared according to GB603-77). 3.5 Silver nitrate (GB670-77): 0.02M solution. 8.6 Sodium carbonate (GB639-77): 5% solution. 4 Preparation of samples
Knock off a few pieces with a total weight of about 100-200g from each part of two similar products. For those with glaze, use a wheel to grind off the glaze layer and the middle layer, put them in a mortar and beat them, and sieve them continuously until all of them pass through a sieve with a mesh of 1.6mm. Then use a sieve with a mesh of 0.9mm to sieve out the fine particles, then rinse with water, wash the particles on the sieve, and sieve out all the fine particles smaller than 0.9mm. Put the washed particles into a container, wash them several times with distilled water, place them in a drying oven at 105-110℃ to dry them until constant weight, take them out and store them in a desiccator for later use. 5 Test steps
5.1 Accurately weigh about 1g of the dried sample, accurate to 0.0004g, and put it into a conical flask. 5.2 When measuring acid resistance, inject 25±0.5ml concentrated sulfuric acid, and when measuring alkali resistance, inject 25±0.5ml 10% sodium hydroxide solution, and shake to make the particles wet and sink.
5.3 Install a reflux condenser on the conical flask, place it on an adjustable disc-shaped electric furnace, and heat it to a slight boil. Keep it at a slight state for 1h and then turn off the electric furnace.
5.4 After cooling the sample until it is no longer boiling or no white steam is emitted, slowly and gradually add about 50ml of distilled water from the upper end of the condenser with a washing bottle. After the white steam in the conical flask and condenser disappears completely, remove the condenser and rinse the lower end of the condenser, the condenser and the flask with about 50ml of distilled water. Be careful not to splash the washing water. GB4738.2-84
5.5 Remove the conical flask, pour out the upper solution and filter it in a glass funnel. 5.5.1 When measuring the wide formaldehyde resistance: After the upper clear liquid is poured out, add nearly boiling distilled water to the flask several times to rinse the particles, and pour the washing liquid into the glass funnel filter paper until it is neutral when tested with methyl orange indicator liquid. Then add 50ml of 5% sodium carbonate solution into the conical flask, and boil the particles in the flask for about 15 seconds, shaking continuously. Pour the hot alkali solution into the glass funnel filter paper. Use hot distilled water to clean the particles until they are neutral when tested with phenol indicator wave. Carefully rinse all the particles into the filter paper, and then rinse with hot distilled water several times to stop.
5.5.2 When determining the alkali resistance, after the upper clear layer is poured out, rinse the particles in the flask with distilled water acidified with hydrochloric acid for 3 to 5 times, pour the washing liquid into the glass funnel filter paper, and then rinse repeatedly with boiling distilled water until the presence of hydrogen ions is checked with silver nitrate solution! Carefully rinse all the particles into the filter paper, and then rinse with hot distilled water several times to stop. 5.6 Put the corroded particles and filter paper into a porcelain worm that has been weighed in advance and ash them, and place them in a muffle furnace at 900→950℃ to burn to constant weight.
6 Calculation of test results
The test results are calculated according to the following formula:
Where: RH——sample acid resistance, %:
Gl-—sample weight after corrosion, B
G——sample original weight, g.
Formula t. Rou
- Alkali resistance of the sample, %,
- Weight of the sample after corrosion, g!
Go- Original weight of the sample, g.
(2)
The measurement result shall be the arithmetic half mean of two parallel results of the same sample. The difference between the two shall not exceed 0.5%, otherwise the test shall be repeated. 7 Records and reportswww.bzxz.net
Original records and test reports are shown in Table 1 and Table 2: Table 1
Original records of acid and alkali resistance
Specimen number
Specimen name
Test single diameter:
Original weight
After corrosion
Specimen egg measuring plate
Acid resistance
Alkali resistance
Tester
Marking date
Additional instructions:
Sample sending unit
Sample sent for test
Measurement items
Test method:
Acid resistance H:
Alkali resistance K(m:
Corrosive medium:
Sample particle size:
Supervisor:
GB47a8.284
Test report
Measurement result
Sample number
Service number
Report period
Tester:
This standard was proposed by the Ministry of Light Industry of the People's Republic of China and is technically managed by the Ceramics Research Institute of the Ministry of Light Industry. This standard was drafted by the Jiangsu Ceramics Research Institute. The main drafters of this standard are Zhang Baoyu and Deng Wanyu.
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