This standard specifies the method for determining the adhesion of vulcanized rubber to metal and its corrosion to metal under certain conditions. This standard is applicable to the evaluation of the adhesion of vulcanized rubber to metal and its corrosion to metal under general conditions. GB/T 14834-1993 Determination of the adhesion of vulcanized rubber to metal and its corrosion to metal GB/T14834-1993 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Rubber, vulcanized-Determination of adhesion to, and corrosion of, metalsGB/T 14834 --- 93
This standard is equivalent to the international standard ISO6505-1984 "Determination of adhesion to, and corrosion of, metals by vulcanized rubber". For metal and rubber assemblies, it is important to avoid adhesion between rubber and metal and corrosion of rubber on metal. Adhesion occurs at the direct contact between metal and rubber, while corrosion may also occur on metal parts away from rubber in a closed system. This corrosion is caused by the precipitation of volatiles from rubber. Because different metals have different corrosion resistance, it is impossible to specify an optimal test condition that can evaluate the corrosion resistance of all metals or alloys. In addition, the strength of the metal's corrosion resistance is also related to the environment in which the metal is located that is affected by the vulcanized rubber. 1 Subject content and scope of application
This standard specifies the method for determining the adhesion of vulcanized rubber to metal and its corrosion to metal under certain conditions. This standard is applicable to the assessment of the adhesion of vulcanized rubber to metal and its corrosion to metal under general conditions. 2 Reference standards
GB2941
Chemical reagents Acetonewww.bzxz.net
Carbon structural steel
Standard temperature, humidity and time for environmental conditioning and testing of rubber samples GB3190
GB5231
GB5232
GB6003
GB 9868
3 Principle
Chemical composition of aluminum and aluminum alloy processed products Chemical composition and product shape of processed copper
Chemical composition and product shape of processed brass
Test sieve
Rubber obtains test temperature higher or lower than normal temperature General rules The vulcanized rubber sample is clamped between two metal test plates and placed in a certain test environment for a certain period of time under specified conditions, and the rubber sample is taken out. Then the metal surface is visually inspected to determine the degree of adhesion and corrosion. 4 Materials
4.1 Acetone (for cleaning metal): analytically pure, which shall comply with the provisions of GB686. 4.2 Other applicable solvents (for cleaning rubber): other applicable solvents of analytical grade. Such solvents shall not have a harmful effect on the rubber specimen.
4.3 Pumice powder: Pumice powder shall pass through the standard test sieve with a hole size of 53μm specified in GB6003, or a standard test sieve with a hole size of 63μm.
Approved by the State Administration of Technical Supervision on December 30, 1993 476
Implemented on October 1, 1994
4.4 Distilled water or water of corresponding purity.
5 Test apparatus
GB/T14834—93
5.1 The supporting fixture shall be able to align the strip metal test plate and the rubber specimen, bear the clamping force, and have a fixture adjustment mechanism to maintain the clamping force on the "sandwich" of the combined specimen during the entire test cycle (see figure). ZZ
Support fixture diagram
1-Fixture position; 2-A strip of metal test plate; 3-Rubber specimen; 4-Screw handle; 5: Positioning pin; 6-10kg weight; 7-10kg weight guide; 8-Base 5.2 Test chamber: The test chamber shall comply with the provisions of GB9868 and have an adjustment device to control the temperature within the range of ±1°C 477
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5.3 Medical finger cots, polyethylene gloves or polypropylene tweezers. 5.4 Magnifying glass with a magnification of 3 to 5 times. 6 Test metal
The test metal shall be the metal specified in the relevant material specifications. If the test metal is not specified, it shall be selected from the four standard test metals specified in Table 1.
Table 1 Standard Test Metal Grades
Standard Test Metals
Brass3
Carbon SteelBamboo
Standard Number
GB3190
GB5232
GB 5231
GB 700
LY11 State CZ
H63 State Y2
T2 State Y:
The metal test plate for the test should be a strip-shaped flat plate with a width of about 25 mm and a length of at least 100 mm. The thickness of the strip metal test plate should be appropriately selected so that it can withstand the clamping force without bending. If only metal sheet is available, the sheet should be supported by a rigid backing material that is non-corrosive to the test metal.
Rubber specimen
7.1 Preparation of specimens
Rubber specimens shall be punched or cut from vulcanized rubber sheets. Rubber specimens shall be square with a side length of 20.0±0.5mm and a thickness of preferably 2.0±0.2mm. 7.2 Number of specimens
At least 2 specimens are required for each sample.
7.3 The time interval between vulcanization and testing
shall comply with the provisions of GB2941.
During the interval between vulcanization and testing, the specimens shall be protected from light as much as possible. 8 Test conditions
8.1 Test temperature
The test temperature may be selected from the temperature series specified in GB2941. 8.2 Test cycle
The test cycle shall be selected according to the following provisions:
22h, 70th, 166+h or multiples of 7d. 8.3 Test humidity
For high temperature tests, a dry environment with a relative humidity of less than 10% shall be used. Other humidity levels may be used for special requirements. If the test must be carried out in a high humidity environment, the two strip metal plates holding the rubber specimen must be made of the same metal. Instructions for use:
1) Aluminum alloys of the grade AICuSiMg condition TF specified in IS( )6505 that meet the standard ISO/R209. 2] Brass of the grade CuZn37 in the condition HA or HB specified in JS( )6505 that meet the standard ISO426/1. 3 Copper of the grade Cu-ETP in the condition HA or HB specified in IS( )6505. +) Carbon steel of the grade Fe360A specified in JS( )6505 that meet the standard IS( )630. 178
GB/T 14834—93
Note: This test is usually carried out in a low humidity environment to ensure that the corrosion caused by other reasons other than rubber corrosion is minimized. 9 Test steps
9.1 Precautions
During the test operation, in order to reduce surface contamination, medical finger cots, polyethylene gloves or polypropylene tweezers must be used to contact the rubber specimens and strip metal plates.
9.2 Surface treatment of rubber specimens
Clean the surface of all rubber specimens with a cotton wool cloth soaked in a solvent that meets the requirements of Section 4.2 to remove surface contaminants (e.g., mold release agent). The solvent used is related to the rubber used in the test. The solvent should not have a harmful effect on the vulcanized rubber specimen (e.g., acetone should not be used for nitrile rubber, while isopropyl alcohol can be used for this rubber). Allow the specimen to dry in air. Unless otherwise specified, after the sample is dried, it should be placed in a clean dryer with silica gel at the standard test room temperature specified in GB2941 for at least 24 hours, and the test should be carried out immediately after it is taken out. Note: Because cleaning the sample may remove wax, anti-ozonants and other substances on the rubber surface, and such substances are generally considered to affect the adhesion and corrosion properties of vulcanized rubber. Therefore, before the test, the sample should be placed in the dryer for a sufficient period of time to re-form the "original" surface. 9.3 Selection of strip metal test panels
During the test, two suitable strip metal test panels are selected from the metals that meet the requirements of Chapter 6 of this standard. The two test panels can be the same or different metals.
9.4 Surface treatment of strip metal test panels
Wipe the test surface of the strip metal test panel thoroughly with a cotton wool cloth dipped in a pumice powder slurry that meets the requirements of Article 4.3 until the surface gloss disappears. Rinse with water that complies with the provisions of Article 4.4, and then thoroughly clean the strip metal test plate with acetone that complies with the provisions of Article 4.1, and finally dry it in the air. If the treated strip metal test plate is not used immediately after cleaning, it should be stored in a clean dryer with silica gel before testing for no more than 24 hours.
9.5 Test
Place two rubber specimens prepared in accordance with Article 9.2 between the surfaces of two strip metal test plates prepared in accordance with Article 9.4. The two rubber specimens are approximately 40 mm apart and are approximately equidistant from each end of the strip metal test plate (see figure). Align the metal-rubber-metal sandwich formed in the supporting fixture, and apply a weight of 10 ± 0.1 kg to the sandwich specimen, which is equivalent to a pressure of approximately 122.5kPa. Tighten the screw handles on the two test panels (one at each end of the strip metal test panel) with appropriate force so that the clamping force can be maintained after the 10kg weight is removed. Remove the 10kg weight from the supporting fixture and place the sandwich sample in a constant temperature test box that meets the requirements of Article 5.3, and keep it at the test temperature until the end of the test cycle. At the end of the test cycle, remove the sample sandwich from the test environment and keep it at the standard test room temperature for at least 1 hour. Loosen the clamp and carefully separate the strip metal test panel from the rubber sample. Condition the strip metal test panel in an environment with a relative humidity of 45% to 55% at standard laboratory temperature for 16 to 24 hours, and then check the metal surface in contact with the rubber for signs of adhesion and corrosion. Use a magnifying glass that meets the requirements of Article 5.4 to check the corrosion.
10 Test result expression
10.1 Adhesion degree
Evaluate the adhesion degree according to the following standards:
a. No adhesion - the rubber sample is completely separated from the two strip metal test plates, and there is no adhesion mark on the metal test plates. b. Adhesion - the metal test plates must be separated by force; or there are rubber particles adhering to the surface of one or two strip metal test plates.
10.2 Corrosion degree
Evaluate the corrosion degree according to the following standards:
a. No pollution, no corrosion - there is no pollution or corrosion on the surface of the metal test plate. 179
GB/T 14834-93
b. Pollution, no obvious corrosion - pollution or discoloration appears on the surface of the metal test plate, but there is no mark or corrosion on the surface of one or two strip metal test plates.
Obvious corrosion -
11 Test report
One or two metal strip test panels have pitting and erosion on their surfaces. The test report should include the following:
Detailed description of the sample and its source;
Metal grade of the metal strip test panel used, reference standard;
Test period, temperature and humidity;
Any deviation from the specified test conditions and procedures; Test results (including details of adhesion and corrosion); Test date;
Tester.
Additional notes:
This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Beijing Rubber Industry Research and Design Institute of the Ministry of Chemical Industry. This standard was drafted by the Shanghai Rubber Products Research Institute. The main drafter of this standard is Zhang Wengang.
This standard is entrusted to the Beijing Rubber Industry Research and Design Institute for interpretation. 180
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