Product Name: Bonded NdFeB/Molded Magnet
Specification model: φ71*φ66.6*15.45mm
Material: NdFeB
Main ingredients: praseodymium, neodymium, iron, boron, epoxy resin, etc.
Magnetization direction: Radial multi-pole magnetization
Magnet use: network equipment / motor rotor / heat dissipation FAN
Magnet Coating: None/Epoxy Resin Electrophoresis
Magnet Color: Primary/Black
Magnet packaging: blister + corrugated carton
Surface magnetic field strength: ≥1500 Gauss
Tolerance class: ISO 14405 E
Hot Tags: network equipment magnets, China network equipment magnets manufacturers, suppliers, factory, mini rare earth magnets, Isotropic Bonded Magnets, circular disc magnets, Pump Magnet Rotor, High Density Isotropic Magnets, cast alnico magnets
Performance
Solvent resistance No abnormality
Salt water resistance>24(h)
High temperature and high humidity resistance>240(h)
Acid resistance>24(h)
Salt spray resistance>24(h)
A.2.1 Magnet solvent resistance test
Dip a new cotton swab in acetone (chemically pure), and rub the outer peripheral surface, inner peripheral surface, and side of the coated product sample magnet 25 times each, and observe with the naked eye.
The part of the magnet coating that has been wiped must not have wrinkles, peeling, or swelling, and compare it with the part that has not been wiped. If there is no obvious discoloration, wipe the product sample
When there is no significant change in the coloring degree of the cotton swab, it is judged as qualified.
A.2.2 Salt water resistance test of magnet
In a cleaned 100 mL beaker, put 2.4g NaCl (chemically pure), and then add 77.6g of third-grade water for laboratory use (according to
According to GB/T6682), make a 30g/L NaCl aqueous solution, immerse the coated magnet sample, and immerse it at room temperature at 23 ℃ ± 3 ℃ for 24h
After taking it out, observe it with a 10-magnification magnifying glass. The coating film of the sample magnet (except for the electrode contact during coating) has no corrosion, dissolution, peeling, expansion, color and
When there is no significant change in the degree of vividness, it is judged as qualified.
A.2.3 High temperature and high humidity resistance test of magnet
Put the coated magnet sample in the constant temperature and humidity standard test box, and store it at 90% relative humidity and 80 °C ± 1 °C test temperature
After 240h, take out the magnet and place it at 23°C±3°C for 2h, use a 10 times magnifying glass to observe the coating surface of the magnet sample, there is no rust and expansion phenomenon,
is judged to be qualified.
A.2.4 Acid resistance test of magnet
Put 10mL of hydrochloric acid [(1+2), chemically pure] into a cleaned 200mL plastic bottle, then add 60mL of third-grade water for laboratory use,
6
GB/T18880—2012
Order number: 0205220506414101 Anti-counterfeiting number: 2022-0506-0818-1693-3687 Purchaser: Highmag Magnet Technology (Shenzhen) Co., Ltd.
Highmag Magnet Technology (Shenzhen) Co., Ltd. dedicated
Prepare it into hydrochloric acid (1+19), put it into the coated magnet sample, cover it and let it stand for 24 hours, then take out the product sample, wash it at 23 ℃ ±
Dry at 3°C for 2 hours, observe with a 10 times magnifying glass, the coating film of the sample (except for the electrode contact during coating) has no swelling, cracking, peeling, gas
When there is no significant change in color and vividness, it is judged as qualified.
A.2.5 Magnet salt spray resistance test
Put the coated product sample in the salt spray standard test chamber, and the main conditions of the test must comply with GB/T2423.17 and
GB/T2423.18 requirements. The pre-test treatment of magnet samples can be properly cleaned, but abrasives and corrosion or inhibitory substances cannot be used.
Cleaning with solvents that are not effective, and the cleaning method must not damage the surface. After the magnet sample is cleaned, dry the moisture with a clean cloth or absorbent paper, or use
Dry with oil-free dry air. Handprint pollution will cause serious bad test results, so the sample must not have any handprint pollution after cleaning.
After the salt spray test is completed, the sample is taken out and placed at a temperature of 23°C±3°C for 2 hours, and observed with a magnifying glass of 10 times.
Except for electrode contacts) without swelling, splitting, peeling, air bubbles, softening, dissolution, and no significant change in color and brightness, it is judged as qualified.
A.2.6 Adhesive tape peel test
Fix the coated product sample on the table, and use a single-sided cutting blade to draw the word "well", and the tip of the knife must be used to cut into the knife mark, opposite to the coated one.
The knife tip is perpendicular to the coating surface, penetrates the coating film, and the distance between each cut is about 1mm. Then stick the 3M600 tape on the marked "well"
On the magnet sample, lift the tape at one end for instant pulling, and if the coating film has no defects, it is qualified.
