GB/T 5003-1999 Determination of chemical corrosion resistance of ceramic glaze

This standard specifies the test method for determining the chemical corrosion resistance of daily-use ceramic glaze at room temperature. This standard is applicable to glazed products such as daily-use porcelain, stoneware, pottery, etc. GB/T 5003-1999 Determination of chemical corrosion resistance of daily-use ceramic glaze GB/T5003-1999 Standard download decompression password: www.bzxz.net

GB/T5003—1999
This standard is revised with reference to the relevant provisions of 1ISO/DIS10545/13:1994 Ceramic Tiles
Determination of Chemical Corrosion Resistance. This standard is revised according to GB/T1.1--1993 Guidelines for Standardization Unit 1: Rules for Drafting and Presentation of Standards Part 1: Basic Provisions for Standard Writing. This standard will replace GB/T5003--1985 from the date of implementation. This standard is proposed by the State Bureau of Light Industry.
This standard is under the jurisdiction of the National Ceramic Standardization Center. The responsible drafting unit of this standard: China Light Industry Association Ceramic Research Institute. The main drafter of this standard: Yao Jilie.
1 Scope
National Standard of the People's Republic of China
Checking and measuring to the chemical corrodingresistance of glazes of domestic ceramicsGB/T 5003-1999
Replaces GB/T5003-1985
This standard specifies the test method for measuring the chemical corrosion resistance of glazes of domestic ceramics at room temperature. This standard is applicable to glazed products such as domestic porcelain, mulberry, and pottery. 2 Definitions
This standard adopts the following definitions.
Chemical Corrosion
The specimen is directly exposed to the test solution, and after a certain period of time, its degree of corrosion is observed and determined. 3 Test Solution
3.1 Household Chemicals
Ammonium fluoride: 10% (g/L).
Potassium hydroxide: 10% (g/L).
3.3 Cleaning liquid
Glacial acetic acid, 1% (V/V). d=1.05,
4 Equipment and tools
4.1 A balance with a sensitivity of 0.05g.
4.2 Borosilicate glass rod.
4.3 White cotton cloth or soft cloth.
4.4 A pencil with a hardness of HB (or equivalent). 4.5 A 40 milky white light bulb.
4.6 An oven that can control the temperature at ±5°C. 5 Samples
Take ten products of the same shape and size without defects such as cracks, glaze deficiency, thin glaze, etc. as samples for testing. 6 Test steps
6.1 Clean the samples with water, dry them, and keep them clean for use. 6.2 Inject 10% ammonium chloride and 10% potassium hydroxide solution into five samples to be tested respectively, so that the liquid level is 1/2 of the sample volume. Approved by the State Administration of Quality and Technical Supervision on August 12, 1999, and implemented on February 1, 2000
GB/T 5003---1999www.bzxz.net
6.3 Cover the sample and etch it at a temperature of 20℃±5℃. 6.4 When testing the corrosion resistance of household chemicals, keep the test solution in contact with the sample for 24h6.5 When testing the corrosion resistance of alkali, keep the test solution in contact with the sample for 96h, gently stir the test solution once a day, replace the solution after 48h, and pour out the test solution after another 48h.
6.6 Soak the sample in 1% acetic acid aqueous solution for 30min, then rinse it with water and dry it. 6.7 Dry the sample in an oven at about 100℃, and cool it to room temperature after taking it out. 7 Evaluation after the test
7.1 Visual inspection
Distinguish the samples with obvious corrosion effect on the glaze surface from those without obvious corrosion effect. During the visual inspection, the distance between the eyes and the glaze surface is about 250mm, and it can be carried out under spontaneous lighting or artificial lighting.
For the samples without obvious corrosion effect during visual inspection, the pencil test (7.2) shall be carried out. If there is obvious corrosion effect, the reflected light test (7.3) shall be carried out. 7.2 Pencil test
For the samples without obvious corrosion effect after visual inspection, use HB pencil to draw multiple lines on the glaze surface, and the lines should pass through the corroded area and the uncorroded area. Then use cotton cloth dipped in distilled water or deionized water and twist it dry to rub the lines. If it can be wiped off, it is grade A, and if it cannot be wiped off, it is grade B. 7.3 Reflected light test
Use electric light to illuminate, the distance between the electric light and the sample is (350100)m, and the light incidence angle is 45°. Repeatedly observe the clarity of the electric light image at the corroded and uncorroded surface reflection (not millimeter). If the image is clear, it is grade A, and if the image is unclear, it is grade D. 7.4 Glaze corrosion resistance classification
After pencil test and reflected light test, the corrosion of the axle surface shall be graded according to Table 1. Table 1 Glaze corrosion resistance classification
Axial surface corrosion
No obvious corrosion effect, pencil test line can be erasedNo obvious corrosion effect, pencil test line can not be erasedObvious corrosion effect, reflected light test image is clearObvious corrosion effect, reflected light test image is not clearNote, if there is a slight change in color, it cannot be considered as chemical corrosion. 8The report
should include the following:
a) Sample sending unit, sample sending date:
b) Sample name, test items:
c) Test method standard number and name;
d) Test results (the level of each test solution acting on each sample); e) Test date, test personnel:
f) Explanation of the test results.
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