GB 4738.1-1984 Determination of acid and alkali resistance of daily-use ceramic materials (block method) GB4738.1-1984 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test method for acid and alkali resistance for ceramic materials of daily use (lump test method)
Standsrd test method fax acid,ataline Tesistancefor ceramic materials of dally use(lump test method)
This standard applies to glazed or unglazed oral ceramics with a water absorption rate greater than 5%. 1 Definition
UDC 666,31 : 620
.193.4
GB $T38.1 -84
The (alkali) resistance of daily-use ceramics refers to the resistance of daily-use ceramic materials to (alkali) corrosion. The quality of its acid (alkali) resistance is expressed by the acid (alkali) resistance.
The standard is to use the cutting mx2 damage × day m buckle method to make the sample (the thickness of the sealed device is the thickness of the product to grind off the glaze layer) slightly boiled in concentrated sulfur or 10% sodium oxide) brain corrosive medium for 1h, and the ratio of the weight of the sample that has not been corroded to the weight of the original sample is the acid (alkali) resistance of daily-use ceramic materials.
Equipment and tools
Analysis day, sensitivity is 1/1000g.
2, electric heating explosion box.
2.3 Uve furnace: maximum temperature 1000℃.
2.4 Cutting peach.
2.5 Grinding machine.
2.6 Adjustable disc-shaped electric furnace: maximum power 800W. 2.7 Erlenmeyer flask: 250~50m1.
2.8 Snake reflux condenser: length 300~500mm. 2.9 Desiccator with color-changing silica gel.
Beaker: 500~ml.
Porcelain snail: 25~50ml.
Plastic washing bottle and thermometer: 100℃.
Imperial Standard Bureau 158±-11-02 issued
1985-08-01 implementation
3 Reagents
3,1 Sulfuric acid (GR625—-37).
GB47&8.1-84
Overflow condensation device
3.2 Sodium hydroxide (GB629—77): 10% solution. 3.3 Methyl orange (HGB3089-59): 0.1% indicator solution (prepared according to GB603-77 "Chemical reagent preparation and product preparation method"). 4 Phenol (HGB3039-59): 1% indicator solution (prepared according to GB603-77). 3.5 Silver nitrate (GB670-77): 0.02M solution. a.8 Anhydrous carbonic acid (GBB9775% solution
4 Preparation of test samples
Search 30mmx20mX6 single test samples from the upper, middle and lower parts of two similar products, with a thickness accurate to +1mm, and a length and width accurate to ±5mm. For products with a wall thickness of less than 6mm, the thickness of the test block can be taken from the thickness of the product, and the glaze layer is ground off. Cutting method: Porcelain is made by measuring the vertical surface, and the test block thickness is the wall thickness of the product. For those with glaze, the cooked layer and the middle layer are ground off, and the separation is made. The cross section of the product is perpendicular to the surface of the product. The length or width of the test block is the direction of the product wall thickness. One thickness surface of the test block must be the original surface of the product. If the wall thickness is less than 15mm, it can be cut in the same way as the porcelain test block. Grind off the glaze layer and small interlayer. Grind almost all six sides, and the corners can be slightly flat. Measure accurately and record the size of the test block.
Then rinse the surface of the test block with water, shrink it and place it in a 105-110℃F drying oven to constant weight, take it out and store it in a desiccator for testing. 5 Test steps
5.1 Accurately weigh the 1 dry test block to an accuracy of 0.00045, carefully place it in a conical flask, leave a certain distance between the test blocks, and place it flat on the firing line surface.
5.2 When determining acid resistance, inject concentrated sulfuric acid, and when determining alkali resistance, inject 10% caustic soda solution, and the maximum injection should be about fcm above the test solution.
GB 473.1-Life
5.3 Install the reflux condenser on the conical flask, place it on an adjustable disc-shaped electric furnace, and heat it to a slight boil. Keep it in a slight boiling state for 1 second, then turn off the electric furnace.
5. Cool the sample until there is no more white steam or vapor, and remove it from the condenser after the outer wall of the conical flask cools to about 50-60°C. 3.5 Remove all corrosive media
6.5.1 When determining the acid resistance, add about 100 ml of distilled water, place it on the electric furnace and heat it to a slight stagnation for about 10-15 minutes, and occasionally stir and pour off the washing liquid, repeat several times, and test with methyl orange indicator solution until it is neutral. Then add 100 ml of 5% sodium carbaldehyde solution, place it on the electric furnace and heat it to a slight stagnation. Boil for about 0-15 minutes, shake occasionally, pour out the washing liquid, repeat 3-5 times, add about 1 ml of distilled water and boil for 10-15 minutes, pour out the washing liquid, until the washing liquid is neutral when tested with phenol indicator solution. 5.5.2 When determining the alkalinity resistance, add about 100 ml of distilled water, add 2-3 drops of hydrochloric acid, heat it on an electric furnace to about 60-70℃ for about 1G-15 minutes, shake occasionally, pour out the washing liquid, repeat 3-5 times. Add about 100 ml of distilled water. Boil for 10-15 minutes, pour out the washing liquid, until the washing liquid is free of chloride ions when tested with silver nitrate solution. 5.6 Put the cleaned test piece into a pre-weighed porcelain crucible and place it in a 900 muffle furnace to burn to constant weight. 6 Calculation of test results
The calculation formula of the splash test result is as follows:
Wu: RH sample resistance, Lu
G,——weight of sample after corrosion, g1
G—original weight of sample, B.
Wu: RoH—magnetic resistance of sample, %
——weight of sample after corrosion, 5
Ga—original weight of sample, B.
The arithmetic mean of six test blocks of the same sample is taken as the result of the splash test. The relative deviation shall not exceed 5%, otherwise it shall be retested. 7 Record and report
The original test results of acid resistance and alkalinity resistance are shown in Table 1 and Table 2. Table 1 Original record of acid and alkali resistance determination Selection
Test group number
Sample name
Test unit:
Original picture
After recovery
Sample photography
No acidity
Splash tester
Additional instructions:
Sample delivery unit
Samples delivered
Determination items
Test method:
Acid resistance HH
Alkali resistance ReH:www.bzxz.net
Corrosive medium:
Sample size:
Supervisor:
GB4738.1-84
Test report
Measurement result
Sample number
Report number
Report period
Tester:
This standard is proposed by the Ministry of Light Industry of the People's Republic of China and is technically managed by the Ceramic Research Institute of the Ministry of Light Industry. This standard is drafted by the Jiangsu Ceramic Research Institute. The main drafters of this standard are Zhang Baoyu and Deng Wanyu. 56
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