Standard number: GB/T 16266-2019 Standard name: Test method of packaging materials--Contact corrosion English name: Test method of packaging materials--Contact corrosion Standard format: PDF Release time: 2019-10-18 Implementation time: 2020-05-01 Standard size: 723K Standard introduction: 1 Fan Guo This standard specifies the contact corrosion test method for packaging materials to metal surfaces in contact with them, including test environment conditions, reagents and test materials, instruments and equipment, samples, test procedures and test reports This standard is applicable to the contact corrosion test of packaging materials to aluminum. For the contact corrosion test of other metal material surfaces, please refer to 2 Normative reference documents The reference is indispensable for the application of this document. For all dated references, only the dated version applies to this document For dated references, the latest version (including all amendments) applies to this document GB/T678 Chemical reagent ethanol (anhydrous ethanol) GB/T68 Chemical reagent propylene glycol GBT699 High-quality carbon structure GB/T3880.1 General industrial aluminum and aluminum alloy plates and strips Part 1: General requirements GB/T662 Specifications and test methods for water used in analytical laboratories GB/T157 23 Laboratory glass instrument dryer GB/T30435 Electric heating drying oven and electric heating blast drying oven SH0004 Solvent oil for rubber industry 3 Test environment conditions The test should be carried out in an environment of 30℃-30℃ and relative diffuseness not more than 80% 4.1 Anhydrous ethanol Should meet the requirements of GB/T678 and be analytical grade and above 42 Solvent oil Should meet the requirements of SH004 Should meet the requirements of GB/T687 and be analytical grade. 240 aluminum oxide or silicon carbide sandpaper
This standard specifies the test method for contact corrosion of packaging materials to metal surfaces in contact with them, including test environment conditions, reagents and test materials, instruments and equipment, samples, test procedures and test reports. This standard is applicable to the contact corrosion test of packaging materials on steel and aluminum, and can be used as a reference for contact corrosion tests on the surfaces of other metal materials.

ICS55.020
National Standard of the People's Republic of China
GB/T16266—2019
Replaces GB/T16266—2008
Test method of packaging materialsContact corrosion
Test method of packaging materialsContact corrosionPublished on 2019-10-18
State Administration for Market Regulation
Standardization Administration of the People's Republic of China
Implemented on 2020-05-01
This standard was drafted in accordance with the rules given in GB/T1.1-2009. This standard replaces GB/T16266—2008 "Test method of packaging materialsContact corrosion". Compared with GB/T16266-2008, this standard has the following major technical content changes, in addition to editorial changes: terms and definitions have been deleted (see Chapter 3 of the 2008 edition); requirements for test environment conditions have been added (see Chapter 3); requirements for dryer size have been modified (see 5.2, 4.2 of the 2008 edition); sample pretreatment requirements have been deleted (see 5.2.4 of the 2008 edition); GB/T16266-—2019
has modified the hard The operating requirements for granular or blocky materials (see 6.2 and 7.3.2, 5.2.2, 5.2.3 and 6.1 of the 2008 edition); the sample quantity description for granular materials was added (see 6.3.5.2.3 of the 2008 edition); the requirements for the cleaning medium and storage time of the test piece were modified (see 7.1, 5.1 of the 2008 edition); the preheating temperature of the test piece was modified (see 7.4, 6.4 of the 2008 edition); Appendix A Result Evaluation was added (see Appendix A). This standard was proposed and managed by the National Technical Committee for Packaging Standardization (SAC/TC49). The drafting units of this standard are: Shenyang Anti-Rust Packaging Materials Co., Ltd., China Academy of Mechanical Science Group Co., Ltd., Zhejiang Wuyi Zhangshi Packaging Industry Co., Ltd., Henan Zhongbao Technology Co., Ltd., Henan Huirong Intelligent Technology Co., Ltd., and Shenyang Baojin Metal Protection Technology Co., Ltd.
The main drafters of this standard are: Xu Xinyi, Tang Yanqiu, Zhu Zheng, Xu Guoping, Chen Baoyuan, Li Weizhe, Tan Zhenzhou, Liu Zhijie, Chen Lijia, Zhao Huajian, Zhang Jing, Zhang Haijun.
The previous versions of the standards replaced by this standard are: GB/T16266-1996, GB/T16266-2008. 1
1Scope
Test methods for packaging materials
Contact corrosion
GB/T16266-—2019
This standard specifies the contact corrosion test method for packaging materials to metal surfaces in contact with them, including test environment conditions, reagents and test materials, instruments and equipment, samples, test procedures and test reports. This standard is applicable to the contact corrosion test of packaging materials to steel and aluminum, and can be used as a reference for contact corrosion tests on other metal material surfaces.
Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document GB/T678
GB/T687
GB/T699
Chemical reagents ethanol (anhydrous ethanol)
Chemical reagents glycerol
High-quality carbon structural steel
General industrial aluminum and aluminum alloy plates and strips Part 1: General requirements
GB/T3880.1
GB/T6682
GB/T15723
GB/T30435
SH0004
Specifications and test methods for water in analytical laboratories Laboratory glassware: dryer
Electric drying oven and electric blast drying oven
Solvent oil for rubber industry
Test environment conditions
The test should be carried out in an environment with a temperature of 20℃～30℃ and a relative humidity of no more than 80%. Reagents and test materials
Anhydrous ethanol
Should comply with the provisions of GB/T678 and be analytical grade or above. 4.2
Solvent oil
Should comply with the requirements of SH0004.
Glycerol
Should comply with the provisions of GB/T687 and be analytical grade. 4.4 Sandpaper
240# aluminum oxide or silicon carbide sandpaper,
GB/T16266—2019
5 Metal test piece
Carbon steel test piece
Should meet the requirements of GB/T699. The steel grade is 10. The size is 100mm×50mm×(3mm6mm). 4.5.2 Aluminum alloy test piece
Should meet the requirements of GB/T3880.1, the grade is 2024, the size is 100mm×50mm×(3mm~6mm)4.6
Laboratory water
Should meet the requirements of GB/T6682.
Glass slide
Colorless, transparent, without coating, the size is 75mm×25mm×(3mm~6mm). 4.8
Stainless steel block
Size is 75mmX25mm×25mm
5Instruments and equipment
Electric hot air drying oven
Should meet the requirements of GB/T30435
Dryer
Should meet the requirements of GB/T15723, and the inner diameter of the body is 240mm. 5.3
Electric hair dryer
Hot and cold dual-purpose.
Flexible sheet
Cut representative specimens from different parts of the sample, each specimen size is 75mm×50mm. Note: Flexible sheet refers to soft sheet materials, such as paper and film. 6.2
2Hard or block materials
Cut representative specimens from the flat surface of the sample, each specimen size is 75mm×50mm, and the thickness does not exceed 10mm. If the sample is smaller than the specimen size, multiple samples should be used. Note: Hard materials refer to materials that are not easily deformed, such as cardboard and wood: Block materials refer to non-sheet materials with three-dimensional structures, such as foam blocks and rubber blocks. 6.3
Granular materials
Select a sufficient number of representative samples and grind them to particles that can pass through the 40 self-standard sieve but cannot pass through the 80 self-standard sieve. Each sample should be able to cover an area of ​​50mm×25mm, and the metal test piece should not be exposed in the covered area. 2
For materials that are not suitable for grinding, each sample should be able to cover an area of ​​50mmX25mm. Note: Granular materials refer to powdery and granular materials, such as granular desiccant and vapor phase anti-rust powder. 6.4 Bag materials
GB/T16266-—2019
Select representative samples as specimens, and the size of each specimen shall not be less than 50mm×50mm. If it is smaller than this size, multiple specimens should be used.
Note: Bag materials refer to materials used in bag packaging, including the contents and packaging bags, such as bagged desiccant, bagged vapor phase rust inhibitor, 7 Test steps
Polishing and cleaning of metal test pieces
Polish all surfaces of the metal test pieces with sandpaper to remove pits, scratches and rust. Then use 240 sandpaper to polish a 100mmX50mm surface of the test piece as the test surface. Use medical gauze to scrub the polished test pieces in three containers containing anhydrous ethanol in turn: blow dry with a hair dryer after scrubbing and use immediately. For test pieces with grease attached, they should be cleaned with solvent oil before polishing and cleaning. The test pieces should not be touched with bare hands during the handling process. 7.2 Cleaning of glass slides and stainless steel blocks
Glass slides and stainless steel blocks should be cleaned twice with anhydrous ethanol before use, and blow dried with a hair dryer for standby use. Glass slides and stainless steel blocks should not be touched with bare hands during and after cleaning. 7.3 Assembly of test piece
7.3.1 Flexible sheet
Cover the metal-contacting side of the sample downward on the middle of the metal test piece, press a glass slide on the middle of the sample, and then press the stainless steel block on the glass slide. The direction of the glass slide and the stainless steel block should be perpendicular to the long direction of the metal test piece, as shown in Figure 1. Unit: mm
Figure 1 Schematic diagram of flexible sheet test piece assembly
GB/T16266—2019
Explanation:
1-—Metal test piece;
2——Stainless steel block:
3——Sample;
Glass slide.
7.3.2 Hard, block or bagged materials
Figure 1 (continued)
Units are in millimeters
Put the metal-contacting side of the specimen downward over the middle of the metal test piece, place a glass slide on top of the specimen, and then press the stainless steel block onto the glass slide, as shown in Figure 1. Large samples should be placed off-center to ensure that the test piece surface has a minimum of 50 mm × 50 mm covered surface. 7.3.3 Granular materials
Place the specimen evenly between parallel lines 25 mm apart in the center of the test piece. Carefully cover with a glass slide, and then press the stainless steel block onto the glass slide, as shown in Figure 2. 4
Explanation:
Metal test piece;
Specimen;
3—Stainless steel block;
Glass slide.
7.4 Test
Figure 2 Schematic diagram of granular material test piece assembly GB/T16266—2019
Place the assembled test piece on the desiccator tray and preheat it in an electric blast drying oven at 65℃±2℃ for 30min. Then take out the test piece and the desiccator tray and immediately put them in a desiccator preheated at 49℃±2℃ with 300mL of 69% glycerol aqueous solution at the bottom. Apply a small amount of vacuum sealing ointment or medical vaseline evenly on the ground joint, cover the lid and fix it with tape, and then put it in an electric blast drying oven at 49℃±2℃. The carbon steel test piece (4.5.1) is placed for 20h; the aluminum alloy test piece (4.5.2) is placed for 72h.
Carry out three sets of parallel tests.
5 Result Check
After the test, remove the sample from the test piece surface and immediately check the corrosion condition of the test piece test surface. If it is difficult or impossible to judge the corrosion condition, the test piece should be cleaned with anhydrous ethanol before inspection. Record the test surface, including the covered and uncovered parts of the glass slide, whether the uncovered part has rust spots, pitting, loose or granular products and discoloration, and describe the quantity, state and distribution as well as other test phenomena. 5
GB/T16266—2019
When necessary, refer to Appendix A to evaluate the results of steel test pieces and aluminum alloy test pieces. Test report
The test report should include at least the following contents: a)
Test purpose;
This standard number;
Detailed description of the test pieces and samples used in the test, including type, size, quantity, state, etc.; test environment conditions;
Test conditions: temperature, time and concentration of glycerol aqueous solution, etc.; test results, including evaluation when necessary;wwW.bzxz.Net
Test date;
Signature of the tester;
Any deviation from this standard and any situation that may affect the results. AG
A.1 Scope
Applicable to the evaluation of the results of three parallel tests A.2
Test piece rating
Appendix A
(Informative Appendix)
Result evaluation
The corrosion degree of the test piece surface covered by the sample after the test shall be rated according to the following provisions: Grade 0: No corrosion. Bright as before.
Grade 1: No corrosion. Loss of gloss or slight discoloration Grade 2: Slight corrosion. The number of rust spots with a diameter less than 1 mm is not more than 3. Grade 3: Mild corrosion. The number of rust spots with a diameter less than 1 mm is more than 3 but not more than 10. GB/T16266—2019
Grade 4: Moderate corrosion. The diameter of the rust spot is greater than 1 mm or the number of rust spots is more than 10, and the corrosion area does not exceed 50% Grade 5: Severe corrosion. The corrosion area exceeds 50%. Evaluation of test results
The evaluation of parallel test results is as follows:
When the grade difference between the three test pieces does not exceed one level, two test pieces with the same grade are used for grade determination; b) When the grade difference between the three test pieces exceeds one level, the test should be repeated.
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