Some standard content:
National Standard of the People's Republic of China
Vapor corrosion inhibition ability
Test method for packaging materials
Test of packaging materials--Vapors corrosion inhibiting ability1Subject content and scope of application
GB/T 16267-1996
This standard specifies the determination of the corrosion inhibition ability of packaging materials containing vapor phase rust inhibitors to metals under normal conditions or after causing accelerated consumption.
This standard is applicable to the determination of vapor phase rust inhibitor paper, vapor phase rust inhibitor film and single-layer and multi-layer composite packaging materials containing vapor phase rust inhibitors. 2 Reference standards
Chemical reagents Ethanol (anhydrous ethanol)
Chemical reagents 95% ethanol
GB 699
Chemical reagents Glycerol (glycerine)
Technical conditions for high-quality carbon structural steel
GB1922
GB4437bzxZ.net
GB10455
3 Terms
Solvent oil
Aluminum and aluminum alloy hot extrusion pipe
Silica gel desiccant for packaging
3.1 Corrosion corrosion
Material deterioration caused by chemical reaction. This deterioration is usually caused by oxidation, acid or alkali action, electrochemical action, etc. In this test, as long as rust spots, corrosion points or loose (or granular) products appear on the surface of the test piece, it is considered to be corrosion. Single discoloration is not considered corrosion.
3.2 Test surface
refers to the surface of the material that has been specially processed. After the test, its corrosion condition should be checked. 4 Instruments, materials, reagents, test pieces and specimens 4.1 Instruments and materials
Electric constant temperature drying oven: (100~～200)℃±1℃1000mL wide-mouth bottle: Diameter: inner diameter 58mm, height 200mm, bottom ±110mm13 rubber stopper: large surface of the stopper 62mm, small surface 50mm and height 36mm; No. 9 rubber stopper: large surface of the stopper 44mm, small surface 36mm, height 28mmAluminum tube: 16mm×1.5mmX114mm,
240 sandpaper or emery cloth.
4.2 Reagents
Anhydrous ethanol: in line with GB678
95% ethanol: in line with GB679;
State Bureau of Technical Supervision approved 370 on March 12, 1996
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Implementation on September 1, 1996
Glycerol: in line with GB687,
GB/T 716267—1996
Solvent oil: in line with NY190 in GB1922 standard; Silica gel: fine pore type, in line with GB10455.
4.3 Test piece and sample
4.3.1 Test piece
A No. 10 steel block with a diameter of 16mm and a height of 13mm in accordance with GB699 has a hole with a flat bottom, a diameter of 10mm and a depth of 10mm drilled in the center of one end face, and the other side is first processed by a grinder. Before use, it is polished with 240 sandpaper or sandpaper to a surface roughness of R.0.4~0.6am, and there must be no pits, scratches, or rust. Use tweezers to wipe it with absorbent cotton or gauze dipped in solvent oil (twice), 95% ethanol, and anhydrous ethanol. Then use it after drying with hot air. If it is not put into the test at the moment, it can be placed in a silica gel dryer that meets GB10455. If it exceeds 8h, it should be polished and cleaned again before use. Each group of tests requires 4 test pieces, one of which is blank. 4.3.2 Samples
Randomly select the VCI packaging materials within three turns of the coil or the fourth sheet from the top of the flat plate. When sampling, cut the sample at least 100mm away from the edge and cut it into six samples of 150mm×25mm for three sets of devices. 4.3.3 Blank samples
The device is only equipped with test pieces without VCI packaging materials or neutral packaging materials without VCI. 5 Test body assembly
Before assembling the test body, except for the VCI packaging materials and metal test pieces for the test, the wide-mouth bottles, rubber stoppers, thumbtacks, and paper clips should be carefully cleaned, washed twice with distilled water, and then dried or blown dry with hot air. Pass a lead pipe with a diameter of 16mm, a wall thickness of 1.5mm, and a length of 114mm through the center of the No. 13 rubber stopper, and insert the exposed aluminum tubes at both ends into the No. 9 rubber stopper respectively, and the small faces of the two No. 9 rubber stoppers are facing the No. 13 rubber stopper. Make the large surface of the No. 9 rubber stopper into which the small surface of the No. 13 rubber stopper is inserted parallel to the end of the aluminum tube. Place the polished and cleaned smooth surface of the test piece on clean filter paper, align the concave surface of the test piece with the end of the aluminum tube on the large surface of the No. 9 rubber stopper, and press the test piece into the No. 9 rubber stopper on the table so that the concave surface of the test piece is connected to the aluminum tube inside the rubber stopper. The part of the test piece exposed from the large surface of the No. 9 rubber stopper does not exceed 3㎡m. Make the large surface of the No. 13 rubber stopper contact with the small surface of the No. 9 rubber stopper. After pressing, wipe the polished surface of the sample with absorbent cotton soaked in 95% ethanol and anhydrous ethanol respectively, and then blow dry with hot air. Use thumbtacks to pin two 150mm×25mm samples symmetrically and parallelly on both sides of the bottom edge of the No. 13 rubber stopper. Pin a paper clip on the other end of the sample so that the sample is relatively vertical, with the side coated with vapor phase rust inhibitor facing inward. The assembled No. 13 rubber stopper was placed in a 1000mL wide-mouth bottle pre-filled with 50mL of a distilled water solution prepared with glycerol and having a density of 1.0780±0.0004g/mL, as shown in Figures 1 and 2. 6 Test Procedures
6.1 Procedure A Gas Phase Corrosion Inhibition Test
Put the assembled test body in an electric constant temperature drying oven at (40±1)°C, take it out after 4 hours, and quickly fill the aluminum tube on the test bottle with tap water at a temperature of (19±1)°C. Then put it back in the drying oven at (40±1)°C, take out the test body after 3 hours, weigh out the water in the aluminum tube, and immediately observe the condensation on the surface of the steel test piece. During the observation, use tweezers to hold the absorbent cotton soaked in anhydrous ethanol, gently wipe the surface of the test piece, and check whether there is rust on the surface of the sample.
Four groups were tested in parallel, one of which was a blank control without the gas phase rust prevention packaging material. 371
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Rubber stopper
Rubber stopper
GB/T 16267---1996
1000mL wide-mouth bottle
rubber stopper
four-shaped test piece
gas phase fat rust paper
glycerol aqueous solution
Figure 1 Schematic diagram of gas phase corrosion inhibition ability test device 6.2 Procedure B gas phase corrosion inhibition ability test after accelerated consumption 16
rubber stopper
feather sample
Figure 2 Partial enlarged view of the sample device
Cut the gas phase rust inhibitor packaging material into 200mm×300mm, and place 5 qualitative filter papers on a clean and smooth glass plate of similar size. Put the cut gas phase rust inhibitor packaging material on the filter paper with the side coated with gas phase rust inhibitor facing up, and press heavy objects on the four corners of the sample to prevent it from curling during consumption. Then place it in a drying oven at (60 ± 2) ℃, and cool it to room temperature after 120h, 72h, 48h, and 24h (depending on the packaging material standard). Cut six 150mm×25mm test pieces from the middle of the paper, assemble them according to 5 items, and operate according to the provisions of 6.1.
6.3 Corrosion inhibition ability for other metals
If it is necessary to test the gas phase corrosion inhibition ability of gas phase rust-proof packaging materials for other metals other than steel, the metal to be tested can be made into test pieces of the same shape and size required by the cost standard, and the test is carried out according to this standard. However, the temperature, relative humidity and duration of the exposure environment of the assembled test body and the evaluation of the gas phase corrosion inhibition ability need to be fully considered. 7 Result evaluation
The blank test piece has rust, while the surfaces of the three test pieces are bright and rust-free, which is qualified. If there is rust on the surface of one or two test pieces, repeat the test; if all three test pieces are rusted or there is still rust on the test piece after repeated testing, it is unqualified. 8 Test report
The test report should include the following contents:
a: The number of this standard;
b, detailed description of the test pieces and samples used for the test, including type, size, quantity, status, etc.;
d. Pretreatment conditions;
e. Test environmental conditions;
f.Evaluation of test results,
·Differences from this standard during the test; h, test date, signature of the tester, and seal of the test unit. 372
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Additional notes:
This standard is proposed by China Packaging Corporation. GB/T 16267-1996
This standard is under the jurisdiction of the National Packaging Standardization Technical Committee. This standard was drafted by the 621st Institute of China Aviation Industry Corporation, Shenyang Anti-Rust Packaging Materials Company, China Light Industry Association Papermaking Research Institute, and National Packaging Product Quality Supervision and Inspection Center (Jinan). The main drafters of this standard; Luo Yangji, Ding Guozhen, Zhou Jiayan, Zhang Shaoling. This standard refers to the U.S. Federal Standard FED-STD-101 "Test Procedure for Packaging Equipment" Method 4031 "Corrosion Inhibition Ability of Volatile Corrosion Inhibitor Atmosphere".
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